2022/01/22 更新

写真a

ヨシダ マコト
吉田 誠
所属
理工学術院 創造理工学部
職名
教授

兼担

  • 理工学術院   大学院創造理工学研究科

学内研究所等

  • 2020年
    -
    2022年

    理工学術院総合研究所   兼任研究員

  • 2006年
    -
     

    理工学術院総合研究所(各務記念材料技術研究所)   流動研究員

学歴

  •  
    -
    1996年

    早稲田大学大学院   理工学研究科   材料工学専攻 凝固工学研究  

  •  
    -
    1991年

    早稲田大学   理工学部   材料工学科  

学位

  • 早稲田大学   博士(工学)

  • Waseda Univ., Tokyo, Japan   Dr. (Engineering)

経歴

  • 2003年10月
    -
     

    から早稲田大学理工学部 物質開発工学科 助教授

  • 2001年
    -
     

    から文部科学教官 広島大学大学院工学研究科 助手

  • 1996年
    -
     

    早稲田大学大学院理工学研究科博士後期課程修了。博士(工学)。

  • 1996年
    -
     

    から文部教官 広島大学工学部第一類機械系 助手

  • 1996年
    -
     

    早稲田大学大学院理工学研究科博士後期課程修了。博士(工学)。

  • 1995年
    -
     

    日本金属学会論文賞()(1999)

  •  
     
     

    日本金属学会金属写真奨励賞

▼全件表示

所属学協会

  •  
     
     

    日本金属学会、軽金属学会、複合材料学会、鋳造工学会

 

研究キーワード

  • 凝固、鋳造、溶融凝固加工プロセス、溶接、自動車用材料

論文

  • Image-based modeling of viscoelastic properties of solidifying Al alloys and model validation

    Matsushita, A, Mizuno, H, Okane, T, Yoshida, M

    Journal of Materials Processing Technology   263   321 - 329  2019年01月  [査読有り]

    DOI

  • Thermal Stress Analysis of Residual Stress in a Cylindrical Aluminum Casting with Cast-in GCI Liner, Taking Recovery Behavior Effect into Account

    Motoyama, Y, Ebihara, N, Shiga, H, Sato, T, Kambe, H, Yoshida, M

    Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science   49 ( 11 ) 5619 - 5635  2018年01月  [査読有り]

    DOI

  • Effect of temperature field and mechanical properties of casting on prediction of hot tearing tendency using FEM thermal stress analysis+1

    Takai, R, Tsunoda, T, Kawada, Y, Hirohara, R, Okane, T, Yoshida, M

    Materials Transactions   59 ( 8 ) 1333 - 1340  2018年01月  [査読有り]

    DOI

  • Dynamic measurement of constraining force from green sand and casting contraction of gray cast iron during cooling

    Seigo Ueno, Haruki Kashimura, Yusuke Sano, Tsuneo Toyoda, Hiroyasu Makino, Makoto Yoshida

    Materials Transactions   59 ( 6 ) 957 - 962  2018年  [査読有り]

     概要を見る

    This study investigated the effects of the restraint from green sand mold for cast iron during cooling process. Gray cast iron (JIS FC300, almost identical to ASTM 45) was cast in a green sand mold, and the constraining force to the casting from the sand mold and the contraction of the casting were measured dynamically from the beginning of solidification to 200°C. The measurement results obtained using the green sand mold were compared with those using the furan sand mold. The maximum constraining force in the green sand mold case was lower than that in the furan mold case. The contraction in the green sand mold at 200°C was greater than that in the furan sand mold. The results showed that the green sand mold restrains the casting less than the furan sand mold during cooling process.

    DOI

  • Low temperature Cu–Cu bonding by transient liquid phase sintering of mixed Cu nanoparticles and Sn–Bi eutectic powders

    Khairi Faiz, M, Bansho, K, Suga, T, Miyashita, T, Yoshida, M

    Journal of Materials Science: Materials in Electronics   28 ( 21 ) 16433 - 16443  2017年11月  [査読有り]

     概要を見る

    © 2017, Springer Science+Business Media, LLC. Fluxless bonding of plateless Cu–Cu substrates at processing temperature lower than 250 °C and low pressure of 0.1 MPa was achieved by transient liquid phase sintering (TLPS) of mixed Cu nanoparticles and Sn–Bi eutectic powders. The effects of mixture composition, and sintering temperature on the shear strength, microstructure, and remelting temperature were investigated. Lowering the sintering temperature of Cu mixed with 65 weight percentage of Sn–Bi (Cu–65SnBi) resulted in decreased shear strength, however, at 200 °C sintering temperature, the obtained highest shear strength was more than 20 MPa. It was found that it is essential to use Cu nanoparticles to accelerate the consumption so that no initial Sn–Bi phases remained after processing. The liquid phase generated at approximately 196 °C during sintering from the reaction between newly formed Cu 6 Sn 5 and Bi-phase was expected to facilitate the densification and strengthening of the joints. Although this newly generated liquid phase was known to solidify as hypereutectic Sn–Bi, by controlling the sintering temperature at 200 °C, the remelting event at 139

    DOI

  • Crack prediction for a partially solidified lead-free bronze casting using thermal stress analysis

    Akira Matsushita, Tomoaki Nakazawa, Toshimitsu Okane, Makoto Yoshida

    JOURNAL OF MATERIALS PROCESSING TECHNOLOGY   249   46 - 56  2017年11月

     概要を見る

    For crack prediction in permanent mold casting of lead-free bronze, elasto-viscoplastic and elasto-plastic thermal stress analyses were performed and compared with the casting tests. The elastoviscoplastic model was constructed by the method which enables to determine rheological properties without steady state stress in experiments. Maximum deviatoric principal (only by the elastoviscoplastic analysis) and hydrostatic stress were in reasonable agreement with the locations of cold cracking and hot tearing in the casting tests, respectively. It was suggested that considering the theological properties of semi-solid alloys was important especially to predict cracks during and after solidification

    DOI

  • Low temperature Cu–Cu bonding by transient liquid phase sintering of mixed Cu nanoparticles and Sn–Bi eutectic powders

    Khairi Faiz, M, Bansho, Kazuma, Suga, Tadatomo, Miyashita, Tomoyuki, Yoshida, Makoto, Yoshida, Makoto

    Journal of Materials Science: Materials in Electronics   28 ( 21 ) 16433 - 16443  2017年11月  [査読有り]

     概要を見る

    © 2017, Springer Science+Business Media, LLC. Fluxless bonding of plateless Cu–Cu substrates at processing temperature lower than 250 °C and low pressure of 0.1 MPa was achieved by transient liquid phase sintering (TLPS) of mixed Cu nanoparticles and Sn–Bi eutectic powders. The effects of mixture composition, and sintering temperature on the shear strength, microstructure, and remelting temperature were investigated. Lowering the sintering temperature of Cu mixed with 65 weight percentage of Sn–Bi (Cu–65SnBi) resulted in decreased shear strength, however, at 200 °C sintering temperature, the obtained highest shear strength was more than 20 MPa. It was found that it is essential to use Cu nanoparticles to accelerate the consumption so that no initial Sn–Bi phases remained after processing. The liquid phase generated at approximately 196 °C during sintering from the reaction between newly formed Cu 6 Sn 5 and Bi-phase was expected to facilitate the densification and strengthening of the joints. Although this newly generated liquid phase was known to solidify as hypereutectic Sn–Bi, by controlling the sintering temperature at 200 °C, the remelting event at 139 °C was not observed by differential scanning calorimetry. It is assumed that the proportion of solidified Sn–Bi eutectic phases in Cu–65SnBi that was sintered at 200 °C were significantly small, hence, when reheated at 150 °C, the obtained shear strength was equivalent to that at room temperature.

    DOI

  • Crack prediction for a partially solidified lead-free bronze casting using thermal stress analysis

    Akira Matsushita, Tomoaki Nakazawa, Toshimitsu Okane, Makoto Yoshida

    JOURNAL OF MATERIALS PROCESSING TECHNOLOGY   249   46 - 56  2017年11月  [査読有り]

     概要を見る

    For crack prediction in permanent mold casting of lead-free bronze, elasto-viscoplastic and elasto-plastic thermal stress analyses were performed and compared with the casting tests. The elastoviscoplastic model was constructed by the method which enables to determine rheological properties without steady state stress in experiments. Maximum deviatoric principal (only by the elastoviscoplastic analysis) and hydrostatic stress were in reasonable agreement with the locations of cold cracking and hot tearing in the casting tests, respectively. It was suggested that considering the theological properties of semi-solid alloys was important especially to predict cracks during and after solidification

    DOI

  • Low temperature and low pressure bonding of plateless Cu–Cu substrates by Ag-based transient liquid phase sintering

    Muhammad, K. F, Yamamoto, T, Yoshida, M

    Journal of Materials Science: Materials in Electronics   28 ( 13 ) 9351 - 9362  2017年07月  [査読有り]

     概要を見る

    © 2017, Springer Science+Business Media New York. Bonding silicon carbide/gallium nitride (SiC/GaN) based power modules, particularly epoxy-molded modules to heat-substrate and/or heat sink, requires low processing temperature preferably lower than 250 °C, and low pressure as low as 0.1 MPa to prevent damage to the modules. In addition, due to the impracticality of depositing metal-plating to the epoxy-molded module, bonding of plateless Cu-substrates is in great demand. Furthermore, post-processing residual flux cleaning, which is costly and unfavorable to industry need to be avoided as possible by opting out the usage of flux. Up to authors’ knowledge, our study is the first to fulfill all requirements stated above. Transient liquid phase sintering (TLPS) of mixed fluxless Sn–Bi (tin–bismuth) eutectic alloy and Ag (silver) particles was applied to bond plateless Cu–Cu substrates. Sintering temperature of 250 °C, sintering pressure of 0.02 MPa, and reducing environment were applied during processing. The effects of addition amount of Sn–Bi and sintering holding time to the shear strength and microstructure were investigated. The remelting temperature after sintering was also examined. Shear strength of 30 wt% added Sn–Bi was over than 20 MPa, which qualify the requirement of MIL-STD-883K, and larger than conventional Pb-based solder. Formation of intermetallic compounds are thought to strengthen the interface and matrix. Remelting temperature shifted from eutectic temperature of Sn–Bi to approximately 262 °C, allowing the application of modules at higher operating temperature than the processing temperature.

    DOI

  • Low temperature and low pressure bonding of plateless Cu–Cu substrates by Ag-based transient liquid phase sintering

    Muhammad, Khairi Faiz, Yamamoto, Takehiro, Yoshida, Makoto, Yoshida, Makoto

    Journal of Materials Science: Materials in Electronics   28 ( 13 ) 9351 - 9362  2017年07月  [査読有り]

     概要を見る

    © 2017, Springer Science+Business Media New York. Bonding silicon carbide/gallium nitride (SiC/GaN) based power modules, particularly epoxy-molded modules to heat-substrate and/or heat sink, requires low processing temperature preferably lower than 250 °C, and low pressure as low as 0.1 MPa to prevent damage to the modules. In addition, due to the impracticality of depositing metal-plating to the epoxy-molded module, bonding of plateless Cu-substrates is in great demand. Furthermore, post-processing residual flux cleaning, which is costly and unfavorable to industry need to be avoided as possible by opting out the usage of flux. Up to authors’ knowledge, our study is the first to fulfill all requirements stated above. Transient liquid phase sintering (TLPS) of mixed fluxless Sn–Bi (tin–bismuth) eutectic alloy and Ag (silver) particles was applied to bond plateless Cu–Cu substrates. Sintering temperature of 250 °C, sintering pressure of 0.02 MPa, and reducing environment were applied during processing. The effects of addition amount of Sn–Bi and sintering holding time to the shear strength and microstructure were investigated. The remelting temperature after sintering was also examined. Shear strength of 30 wt% added Sn–Bi was over than 20 MPa, which qualify the requirement of MIL-STD-883K, and larger than conventional Pb-based solder. Formation of intermetallic compounds are thought to strengthen the interface and matrix. Remelting temperature shifted from eutectic temperature of Sn–Bi to approximately 262 °C, allowing the application of modules at higher operating temperature than the processing temperature.

    DOI

  • Effects of Recovery Behavior and Strain-Rate Dependence of Stress–Strain Curve on Prediction Accuracy of Thermal Stress Analysis During Casting

    Motoyama, Yuichi, Shiga, Hidetoshi, Sato, Takeshi, Kambe, Hiroshi, Yoshida, Makoto

    Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science   48A ( 6 ) 2960 - 2970  2017年06月  [査読有り]

     概要を見る

    © 2017, The Minerals, Metals & Materials Society and ASM International. Recovery behavior (recovery) and strain-rate dependence of the stress–strain curve (strain-rate dependence) are incorporated into constitutive equations of alloys to predict residual stress and thermal stress during casting. Nevertheless, few studies have systematically investigated the effects of these metallurgical phenomena on the prediction accuracy of thermal stress in a casting. This study compares the thermal stress analysis results with in situ thermal stress measurement results of an Al-Si-Cu specimen during casting. The results underscore the importance for the alloy constitutive equation of incorporating strain-rate dependence to predict thermal stress that develops at high temperatures where the alloy shows strong strain-rate dependence of the stress–strain curve. However, the prediction accuracy of the thermal stress developed at low temperatures did not improve by considering the strain-rate dependence. Incorporating recovery into the constitutive equation improved the accuracy of the simulated thermal stress at low temperatures. Results of comparison implied that the constitutive equation should include strain-rate dependence to simulate defects that develop from thermal stress at high temperatures, such as hot tearing and hot cracking. Recovery should be incorporated into the alloy constitutive equation to predict the casting residual stress and deformation caused by the thermal stress developed mainly in the low temperature range.

    DOI

  • Sn-Bi added Ag-based transient liquid phase sintering for low temperature bonding

    Faiz, M. Khairi, Yamamoto, Takehiro, Yoshida, Makoto, Yoshida, Makoto

    Proceedings of 2017 5th International Workshop on Low Temperature Bonding for 3D Integration, LTB-3D 2017    2017年06月  [査読有り]

     概要を見る

    © 2017 JSPS 191st Committee on Innovative Interface Bonding Technology. A low temperature and low pressure fluxless bonding of plateless Cu-Cu substrates has been achieved by transient liquid phase sintering of Ag and Sn-Bi eutectic powder mixture in a formic acid reducing environment. The effects of Sn-Bi addition amount and sintering temperature to the shear strength and microstructure were investigated. Remelting temperature of the sintered paste was also examined. Shear strength of 30 weight percentage added Sn-Bi that was sintered at 250°C was over than 20 MPa. The microstructure varied with the Sn-Bi addition amount, however, mainly consisted of Ag solid solution and/or Ag-Sn intermetallic compounds (IMCs), Bi-rich phase and Cu-Sn IMCs. No remelting event at Sn-Bi eutectic temperature was observed and the remelting temperature shifted to approximately 262°C, implying the possibility for higher operation temperature although the processing was performed at lower temperature.

    DOI

  • Effects of Recovery Behavior and Strain-Rate Dependence of Stress–Strain Curve on Prediction Accuracy of Thermal Stress Analysis During Casting

    Motoyama, Y, Shiga, H, Sato, T, Kambe, H, Yoshida, M

    Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science   48A ( 6 ) 2960 - 2970  2017年06月  [査読有り]

     概要を見る

    © 2017, The Minerals, Metals & Materials Society and ASM International. Recovery behavior (recovery) and strain-rate dependence of the stress–strain curve (strain-rate dependence) are incorporated into constitutive equations of alloys to predict residual stress and thermal stress during casting. Nevertheless, few studies have systematically investigated the effects of these metallurgical phenomena on the prediction accuracy of thermal stress in a casting. This study compares the thermal stress analysis results with in situ thermal stress measurement results of an Al-Si-Cu specimen during casting. The results underscore the importance for the alloy constitutive equation of incorporating strain-rate dependence to predict thermal stress that develops at high temperatures where the alloy shows strong strain-rate dependence of the stress–strain curve. However, the prediction accuracy of the thermal stress developed at low temperatures did not improve by considering the strain-rate dependence. Incorporating recovery into the constitutive equation improved the accuracy of the simulated thermal stress at low temperatures. Results of comparison implied that the constitutive equation

    DOI

  • A New Theoretical Approach Based on the Maxwell Model to Obtain Rheological Properties of Solidifying Alloys and Its Validation

    Akira Matsushita, Ryosuke Takai, Hideaki Ezaki, Toshimitsu Okane, Makoto Yoshida

    METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE   48A ( 4 ) 1701 - 1707  2017年04月

     概要を見る

    This paper proposes a new method for obtaining the rheological properties of solidifying alloys in the brittle temperature range (BTR). In that range, alloys show not only rheological, but also brittle behavior. Conventional methods to obtain rheological properties require steady state stress with ductility. Therefore, rheological properties of BTR alloys are unobtainable, or are otherwise including the effects of microscopic damage. The method proposed in this paper uses the stress-strain relation derived from the Maxwell model assuming that strain hardening is negligible in solid-liquid coexistence states. By removing the plastic strain term, the creep strain rate in Norton's law is derived by the total strain rate and stress rate without the steady state stress condition. Consequently, the stress exponent n and material constant A of Norton's law can be obtained even for alloys in the BTR. We applied this method to both tensile process before crack initiation and stress relaxation process. According to the Maxwell model, couples of the properties (n and A) obtained in both processes must be equal. Therefore, the difference can validate the obtained properties. From tensile and stress relaxation tests, we obtained the properties of solidifying Al-5 wt pct Mg alloy. We validated results by examining the difference. This report is the first to provide a method to obtain the rheological properties of BTR alloy without damage.

    DOI

  • A New Theoretical Approach Based on the Maxwell Model to Obtain Rheological Properties of Solidifying Alloys and Its Validation

    Akira Matsushita, Ryosuke Takai, Hideaki Ezaki, Toshimitsu Okane, Makoto Yoshida

    METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE   48A ( 4 ) 1701 - 1707  2017年04月  [査読有り]

     概要を見る

    This paper proposes a new method for obtaining the rheological properties of solidifying alloys in the brittle temperature range (BTR). In that range, alloys show not only rheological, but also brittle behavior. Conventional methods to obtain rheological properties require steady state stress with ductility. Therefore, rheological properties of BTR alloys are unobtainable, or are otherwise including the effects of microscopic damage. The method proposed in this paper uses the stress-strain relation derived from the Maxwell model assuming that strain hardening is negligible in solid-liquid coexistence states. By removing the plastic strain term, the creep strain rate in Norton's law is derived by the total strain rate and stress rate without the steady state stress condition. Consequently, the stress exponent n and material constant A of Norton's law can be obtained even for alloys in the BTR. We applied this method to both tensile process before crack initiation and stress relaxation process. According to the Maxwell model, couples of the properties (n and A) obtained in both processes must be equal. Therefore, the difference can validate the obtained properties. From tensile and stress relaxation tests, we obtained the properties of solidifying Al-5 wt pct Mg alloy. We validated results by examining the difference. This report is the first to provide a method to obtain the rheological properties of BTR alloy without damage.

    DOI

  • 凍結凝固組織に基づく有限要素解析を用いた固液共存状態の合金の力学特性値予測

    水野 裕登, 天野 麻未, 松下 彬, 岡根 利光, 吉田 誠

    鋳造工学 全国講演大会講演概要集   170 ( 0 ) 36 - 36  2017年

    CiNii

  • バウシンガー効果を考慮した熱応力解析によるアルミニウム合金鋳物の焼入れ時に発生する残留応力予測

    内山 優太, 猶木 和哉, 植田 拓利, 吉田 誠

    鋳造工学 全国講演大会講演概要集   170 ( 0 ) 11 - 11  2017年

    CiNii

  • 鋳型崩壊性評価の定量化に関する試み

    戸羽 篤也, 鈴木 逸人, 稲野 浩行, 平野 繁樹, 兼吉 高宏, 岡根 利光, 吉田 誠

    鋳造工学 全国講演大会講演概要集   170 ( 0 ) 103 - 103  2017年

    CiNii

  • FEM熱応力解析による凝固割れ性予測に及ぼす鋳物の温度場と力学特性の影響

    高井 量資, 角田 達也, 川田 康貴, 広原 嶺, 岡根 利光, 吉田 誠

    鋳造工学   89 ( 10 ) 623 - 630  2017年

     概要を見る

    <p>  It is known that hot tearing tendency increases with the increase in the cooling rate of casting during solidification. As the direct control factors of hot tearing, the cooling rate dependences of the temperature field of the casting and mechanical properties of alloys in the semi-solid state have been suggested. However, quantitative evaluation has yet to be carried out to clarify which parameters are more important for predicting hot tearing tendency.</p><p>  In this study, through thermal stress analysis using the cooling rate-dependent temperature fields of casting and cooling rate-dependent creep parameters in the semi-solid state, hot tearing tendency was predicted for an Al-Mg alloy during solidification. For the prediction, the maximum principal creep strain accumulated during the solidification was used as an indicator of hot tearing tendencies. Then, the hot tearing tendencies were compared with experimental results. As a result, in the cooling rate range of this study which corresponded to gravity die casting, it was found that temperature fields are relatively more critical for predicting hot tearing tendency than the creep parameters.</p>

    CiNii

  • Prediction and Experimental Validation of Cooling Rate Dependence of Viscoplastic Properties in a Partially Solidified State of Al–5 mass%Mg Alloy

    Hirohara Rei, Kawada Yasutaka, Takai Ryosuke, Otaki Mitsuhiro, Okane Toshimitsu, Yoshida Makoto

    MATERIALS TRANSACTIONS   58 ( 9 ) 1299 - 1307  2017年

     概要を見る

    &lt;p&gt;To predict hot tearing in direct chill (DC) casting and shape casting of aluminum alloys using thermal stress analysis, cooling rate dependence of viscoplastic properties in a partially solidified state is indispensable. Based on viscoplastic properties determined from experiments, this study develops a method to predict the temperature dependence of viscoplastic properties at an arbitrary cooling rate through the Clyne–Kurz microsegregation model. For validation of the developed method, tensile tests were performed on Al–5 mass%Mg alloy in a partially solidified state at three cooling rates. Results show good agreement between the predicted values and experimentally obtained values, which demonstrates that the developed method is effective for predicting the cooling rate dependence of viscoplastic properties.&lt;/p&gt;&lt;p&gt; &lt;/p&gt;&lt;p&gt;This Paper was Originally Published in Japanese in J. JILM &lt;b&gt;67&lt;/b&gt; (2017) 214–221.&lt;/p&gt;

    CiNii

  • Prediction and Experimental Validation of Cooling Rate Dependence of Viscoplastic Properties in a Partially Solidified State of Al–5 mass%Mg Alloy

    Hirohara Rei, Kawada Yasutaka, Takai Ryosuke, Otaki Mitsuhiro, Okane Toshimitsu, Yoshida Makoto

    MATERIALS TRANSACTIONS    2017年  [査読有り]

     概要を見る

    <p>To predict hot tearing in direct chill (DC) casting and shape casting of aluminum alloys using thermal stress analysis, cooling rate dependence of viscoplastic properties in a partially solidified state is indispensable. Based on viscoplastic properties determined from experiments, this study develops a method to predict the temperature dependence of viscoplastic properties at an arbitrary cooling rate through the Clyne–Kurz microsegregation model. For validation of the developed method, tensile tests were performed on Al–5 mass%Mg alloy in a partially solidified state at three cooling rates. Results show good agreement between the predicted values and experimentally obtained values, which demonstrates that the developed method is effective for predicting the cooling rate dependence of viscoplastic properties.</p>

    CiNii

  • Al–5mass%Mg合金の半凝固状態における粘塑性の冷却速度依存性の予測と実験的検証

    広原 嶺, 川田 康貴, 高井 量資, 大瀧 光弘, 岡根 利光, 吉田 誠

    軽金属   67 ( 6 ) 214 - 221  2017年  [査読有り]

     概要を見る

    <p>To predict hot tearing in direct chill (DC) casting and shape casting of aluminum alloys using thermal stress analysis, cooling rate dependence of viscoplastic properties in a partially solidified state is indispensable. Based on viscoplastic properties determined from experiments, this study develops a method to predict the temperature dependence of viscoplastic properties at an arbitrary cooling rate through the Clyne–Kurz microsegregation model. For validation of the developed method, tensile tests were performed on Al–5 mass%Mg alloy in a partially solidified state at three cooling rates. Results show good agreement between the predicted values and experimentally obtained values, which demonstrates that the developed method is effective for predicting the cooling rate dependence of viscoplastic properties.</p>

    DOI CiNii

  • Prediction and Experimental Validation of Cooling Rate Dependence of Viscoplastic Properties in a Partially Solidified State of Al-5 mass% Mg Alloy

    Rei Hirohara, Yasutaka Kawada, Ryosuke Takai, Mitsuhiro Otaki, Toshimitsu Okane, Makoto Yoshida

    MATERIALS TRANSACTIONS   58 ( 9 ) 1299 - 1307  2017年  [査読有り]

     概要を見る

    To predict hot tearing in direct chill (DC) casting and shape casting of aluminum alloys using thermal stress analysis, cooling rate dependence of viscoplastic properties in a partially solidified state is indispensable. Based on viscoplastic properties determined from experiments, this study develops a method to predict the temperature dependence of viscoplastic properties at an arbitrary cooling rate through the Clyne-Kurz microsegregation model. For validation of the developed method, tensile tests were performed on Al-5 mass%Mg alloy in a partially solidified state at three cooling rates. Results show good agreement between the predicted values and experimentally obtained values, which demonstrates that the developed method is effective for predicting the cooling rate dependence of viscoplastic properties.

    DOI

  • Al–5mass%Mg合金の半凝固状態における粘塑性の冷却速度依存性の予測と実験的検証

    広原 嶺, 川田 康貴, 高井 量資, 大瀧 光弘, 岡根 利光, 吉田 誠

    軽金属   67 ( 6 ) 214 - 221  2017年  [査読有り]

    DOI

  • A parameterization method of recovery behavior based on initial yield stress – pre-strain diagram for an Al-Si-Cu high pressure die-casting alloy

    Motoyama, Y, Saito, G, Ono, H, Yoshida, M

    Materials Science and Engineering A   684   660 - 667  2017年01月  [査読有り]

     概要を見る

    © 2016 Elsevier B.V. Consideration of recovery behavior in the constitutive equation of alloy is crucially important for accurate thermal stress analysis of the casting process. However, previously reported empirical equations present difficulties when including a coefficient that determines the ratio of the recovery (or strain-hardening) strain component because the alloy recovery behavior has not been investigated systematically. First, this study systematically revealed effects of the temperature and amount of inelastic strain at 200–440 °C on the increase of the initial yield stress of the room temperature (RT) in an Al-Si-Cu high-pressure die casting alloy. Secondly, from those results, an initial yield stress – pre-strain diagram was proposed, demonstrating the effect of the amount of the inelastic strain given at each temperature on the increase of the initial yield stress of RT. Finally, this study newly defined a temperature-dependent contribution ratio of strain hardening to parameterize and duplicate the alloy recovery behavior based on the initial yield stress – pre-strain diagram for the constitutive equation of the alloy. Using this ratio as the coefficient t

    DOI

  • A parameterization method of recovery behavior based on initial yield stress – pre-strain diagram for an Al-Si-Cu high pressure die-casting alloy

    Motoyama, Yuichi, Saito, Gota, Ono, Hiromi, Yoshida, Makoto

    Materials Science and Engineering A   684   660 - 667  2017年01月  [査読有り]

     概要を見る

    © 2016 Elsevier B.V. Consideration of recovery behavior in the constitutive equation of alloy is crucially important for accurate thermal stress analysis of the casting process. However, previously reported empirical equations present difficulties when including a coefficient that determines the ratio of the recovery (or strain-hardening) strain component because the alloy recovery behavior has not been investigated systematically. First, this study systematically revealed effects of the temperature and amount of inelastic strain at 200–440 °C on the increase of the initial yield stress of the room temperature (RT) in an Al-Si-Cu high-pressure die casting alloy. Secondly, from those results, an initial yield stress – pre-strain diagram was proposed, demonstrating the effect of the amount of the inelastic strain given at each temperature on the increase of the initial yield stress of RT. Finally, this study newly defined a temperature-dependent contribution ratio of strain hardening to parameterize and duplicate the alloy recovery behavior based on the initial yield stress – pre-strain diagram for the constitutive equation of the alloy. Using this ratio as the coefficient to determine the proportion of the strain contributing the strain hardening for the constitutive equation, thermal stress analysis can produce more accurate duplication of the experimentally determined recovery behavior. Thereby, the residual stress and deformation of the component in the casting process can be predicted more accurately than when using conventional empirical constitutive equations.

    DOI

  • Elasto-Plastic-Creep Constitutive Equation of an Al-Si-Cu High-Pressure Die Casting Alloy for Thermal Stress Analysis

    Yuichi Motoyama, Hidetoshi Shiga, Takeshi Sato, Hiroshi Kambe, Makoto Yoshida

    METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE   47A ( 11 ) 5598 - 5608  2016年11月  [査読有り]

     概要を見る

    Accurate simulation of residual stress and deformation is necessary to optimize the design and lifetime of casting components. Therefore, the recovery and strain-rate dependence of the stress-strain curve have been incorporated into empirical constitutive equations to improve the thermal stress analysis accuracy. Nevertheless, these equations present several difficulties related to the determination of material constants and their physical bases. This study suggested an empirical elasto-plastic-creep constitutive equation incorporating these phenomena. To determine the material parameters used in this constitutive equation, this study investigated tensile test methods to obtain stress-strain curves that most closely resemble those during or immediately after casting for the Al-Si-Cu high-pressure die-casting alloy JIS ADC 12 (A383.0), which exhibits natural aging. Results show that solution heat treatment with subsequent cooling to the test temperature should be applied to obtain stress-strain curves used for the thermal stress analysis of high-pressure die casting process of this alloy. The yield stresses obtained using the conventional heating method were 50-64 pct higher than those of the method described above. Therefore, the conventional method is expected to overestimate the overestimation of the predicted residual stress in die castings. Evaluation of the developed equation revealed that it can represent alloy recovery and strain-rate dependence.

    DOI

  • Elasto-Plastic-Creep Constitutive Equation of an Al-Si-Cu High-Pressure Die Casting Alloy for Thermal Stress Analysis

    Yuichi Motoyama, Hidetoshi Shiga, Takeshi Sato, Hiroshi Kambe, Makoto Yoshida

    METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE   47A ( 11 ) 5598 - 5608  2016年11月  [査読有り]

     概要を見る

    Accurate simulation of residual stress and deformation is necessary to optimize the design and lifetime of casting components. Therefore, the recovery and strain-rate dependence of the stress-strain curve have been incorporated into empirical constitutive equations to improve the thermal stress analysis accuracy. Nevertheless, these equations present several difficulties related to the determination of material constants and their physical bases. This study suggested an empirical elasto-plastic-creep constitutive equation incorporating these phenomena. To determine the material parameters used in this constitutive equation, this study investigated tensile test methods to obtain stress-strain curves that most closely resemble those during or immediately after casting for the Al-Si-Cu high-pressure die-casting alloy JIS ADC 12 (A383.0), which exhibits natural aging. Results show that solution heat treatment with subsequent cooling to the test temperature should be applied to obtain stress-strain curves used for the thermal stress analysis of high-pressure die casting process of this alloy. The yield stresses obtained using the conventional heating method were 50-64 pct higher than those of the method described above. Therefore, the conventional method is expected to overestimate the overestimation of the predicted residual stress in die castings. Evaluation of the developed equation revealed that it can represent alloy recovery and strain-rate dependence.

    DOI

  • Dynamic measurements of the load on gray cast iron castings and contraction of castings during cooling in furan sand molds

    Naoya Marumoto, Haruki Kashimura, Kazuki Yoshida, Tsuneo Toyoda, Toshimitsu Okane, Makoto Yoshida

    JOURNAL OF MATERIALS PROCESSING TECHNOLOGY   237   48 - 54  2016年11月  [査読有り]

     概要を見る

    After JIS FC300 (almost identical to ASTM 45) gray cast iron was cast in a furan sand mold,both the load on the casting from the sand mold and contraction of the casting were measured dynamically from the beginning of solidification to 200 degrees C. During solidification, the cast iron casting received compressive load from the sand mold attributable to expansion of the casting. After solidification, the load on the casting and the contraction of the casting increased linearly with cooling. During A1 transformation, the load on the casting was relieved because of the casting expansion. After the A1 transformation, the load on the casting and the contraction of the casting increased linearly with cooling again. When the load on the casting reached approximately 13 kN, the load stayed constant, probably because of the sand mold fracture. (C) 2016 Elsevier B.V. All rights reserved.

    DOI

  • Dynamic measurements of the load on gray cast iron castings and contraction of castings during cooling in furan sand molds

    Naoya Marumoto, Haruki Kashimura, Kazuki Yoshida, Tsuneo Toyoda, Toshimitsu Okane, Makoto Yoshida

    JOURNAL OF MATERIALS PROCESSING TECHNOLOGY   237   48 - 54  2016年11月  [査読有り]

     概要を見る

    After JIS FC300 (almost identical to ASTM 45) gray cast iron was cast in a furan sand mold,both the load on the casting from the sand mold and contraction of the casting were measured dynamically from the beginning of solidification to 200 degrees C. During solidification, the cast iron casting received compressive load from the sand mold attributable to expansion of the casting. After solidification, the load on the casting and the contraction of the casting increased linearly with cooling. During A1 transformation, the load on the casting was relieved because of the casting expansion. After the A1 transformation, the load on the casting and the contraction of the casting increased linearly with cooling again. When the load on the casting reached approximately 13 kN, the load stayed constant, probably because of the sand mold fracture. (C) 2016 Elsevier B.V. All rights reserved.

    DOI

  • Grain refinement effects on the strain rate sensitivity and grain boundary sliding in partially solidified Al-5 wt%Mg alloy

    R. Takai, S. Kimura, R. Kashiuchi, H. Kotaki, M. Yoshida

    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   667   417 - 425  2016年06月  [査読有り]

     概要を見る

    This study investigated a mechanism of reducing solidification cracking susceptibility by grain refinement. Previously, the occurrence of grain boundary sliding (GBS) is implied as one mechanism, which is known for the characteristics of superplastic deformation.
    To verify GBS occurrence during solidification of an Al-5 wt%Mg alloy, the effects of refinement on the true stress-true strain curve and the effective power-law coefficient n(eff) (the reciprocal of the strain rate sensitivity) were investigated in a partially solidified state. Furthermore, the contribution of GBS to deformation was examined using the index xi(GBS) defined in the research field of superplasticity. The results are following.
    (1) The grain refined structure elongation is greater than that in the coarse grain structure regardless of the solid fraction. Greater elongation is expected to result from both lower value of the coefficient n(eff) and the higher contribution of the GBS, which provide more uniform deformation.
    (2) Maximum elongation of up to 20% was found at 480 degrees C (f(s): 0.939) in the grain refined structure. Based on the knowledge of superplastic behavior, the values of both n(eff)approximate to 12 and xi(GBS)approximate to 70% at the temperature indicates superplastic-like deformation during the solidification, reducing solidification cracking susceptibility by grain refinement. (c) 2016 Elsevier B.V. All rights reserved.

    DOI

  • Verification of the Mechanism of Grain Refinement by Ultrasonic Treatment of Aluminum-4 Wt Pct Silicon Molten Alloy

    Kazuki Matsuda, Tsuyoshi Takehara, Minghan Yang, Hikaru Uno, Takashi Kubo, Gaku Miyano, Makoto Yoshida

    METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE   47A ( 5 ) 2509 - 2516  2016年05月  [査読有り]

     概要を見る

    Ultrasonic treatment (UST) of molten metals produces a fine grain microstructure. Several mechanisms of grain refining by UST have been suggested; however, experimental verification has not yet established the actual mechanism. In this study, UST was applied to Al-4 wt pct Si molten alloy (1) above the liquidus temperature, (2) during undercooling before recalescence, (3) during recalescence, and (4) after recalescence. After UST treatment, the average grain sizes of the solidified samples were measured, and the effects of UST were evaluated. In the case of (1), the temperatures of the crucible, ultrasonic horn, and the atmosphere of the molten alloy were also confirmed above the liquidus temperature, and a finer grain structure was obtained. This result reveals that UST promotes the nonequilibrium nucleation mechanism. UST during (2) and (3) also caused finer grain microstructures, whereas (4) did not. UST during undercooling hastened nucleation. However, the previously reported mechanism of the breaking dendrite was not activated by UST after recalescence. (C) The Minerals, Metals & Materials Society and ASM International 2016

    DOI

  • Verification of the Mechanism of Grain Refinement by Ultrasonic Treatment of Aluminum-4 Wt Pct Silicon Molten Alloy

    Kazuki Matsuda, Tsuyoshi Takehara, Minghan Yang, Hikaru Uno, Takashi Kubo, Gaku Miyano, Makoto Yoshida

    METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE   47A ( 5 ) 2509 - 2516  2016年05月  [査読有り]

     概要を見る

    Ultrasonic treatment (UST) of molten metals produces a fine grain microstructure. Several mechanisms of grain refining by UST have been suggested; however, experimental verification has not yet established the actual mechanism. In this study, UST was applied to Al-4 wt pct Si molten alloy (1) above the liquidus temperature, (2) during undercooling before recalescence, (3) during recalescence, and (4) after recalescence. After UST treatment, the average grain sizes of the solidified samples were measured, and the effects of UST were evaluated. In the case of (1), the temperatures of the crucible, ultrasonic horn, and the atmosphere of the molten alloy were also confirmed above the liquidus temperature, and a finer grain structure was obtained. This result reveals that UST promotes the nonequilibrium nucleation mechanism. UST during (2) and (3) also caused finer grain microstructures, whereas (4) did not. UST during undercooling hastened nucleation. However, the previously reported mechanism of the breaking dendrite was not activated by UST after recalescence. (C) The Minerals, Metals & Materials Society and ASM International 2016

    DOI

  • Mechanical Properties of a Partially Solidified Cu-Zn Alloy

    Naoki Kasuya, Tomoaki Nakazawa, Akira Matsushita, Toshimitsu Okane, Makoto Yoshida

    METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE   47A ( 4 ) 1661 - 1667  2016年04月  [査読有り]

     概要を見る

    For predicting solidification cracking by thermal stress analysis, the mechanical properties in the partially solidified state based on the experimental results are the best hope. However, the Young's modulus has never been investigated for copper alloys. In this study, stress-strain curves of a Cu-Zn alloy in the partially solidified state for various solid fractions were obtained using a specially developed horizontal tensile test device. Furthermore, by removing the load during the tensile test, the spring-back (elastic behavior) was observed and the Young's modulus was obtained.

    DOI

  • Mechanical Properties of a Partially Solidified Cu-Zn Alloy

    Naoki Kasuya, Tomoaki Nakazawa, Akira Matsushita, Toshimitsu Okane, Makoto Yoshida

    METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE   47A ( 4 ) 1661 - 1667  2016年04月  [査読有り]

     概要を見る

    For predicting solidification cracking by thermal stress analysis, the mechanical properties in the partially solidified state based on the experimental results are the best hope. However, the Young's modulus has never been investigated for copper alloys. In this study, stress-strain curves of a Cu-Zn alloy in the partially solidified state for various solid fractions were obtained using a specially developed horizontal tensile test device. Furthermore, by removing the load during the tensile test, the spring-back (elastic behavior) was observed and the Young's modulus was obtained.

    DOI

  • ダイカストにおける溶湯―金型間の熱伝達係数に及ぼす油性離型剤及び粉体離型剤の影響

    寺山 朗, 府山 伸行, 筒本 隆博, 吉田 誠, 志賀 英俊, 神戸 洋史, 岡根 利光

    鋳造工学 全国講演大会講演概要集   168 ( 0 ) 34 - 34  2016年

    CiNii

  • 鋳鉄製変形評価用鋳物を用いた鋳造後冷却時の反り変形挙動の連続的取得とそのメカニズムの検討

    関口 修兵, 植原 健吾, 本山 雄一, 岡根 利光, 吉田 誠

    鋳造工学 全国講演大会講演概要集   168 ( 0 ) 46 - 46  2016年

    CiNii

  • 弾塑性クリープ構成式によるADC12合金鋳物の熱応力予測と有効性の実験的検証

    志賀 英俊, 佐藤 武志, 神戸 洋史, 本山 雄一, 吉田 誠

    鋳造工学 全国講演大会講演概要集   168 ( 0 ) 48 - 48  2016年

    CiNii

  • Effect of Mn Addition on the Age-Hardening Behavior of an Al-(9–10)%Si-0.3%Mg Die Casting Alloy in T5 and T6 Heat Treatment

    Fukasawa Keita, Mohri Ryousuke, Ohtake Tetsuo, Inoue Tatsuya, Kuroda Akihiro, Kambe Hiroshi, Yoshida Makoto

    MATERIALS TRANSACTIONS   57 ( 6 ) 959 - 965  2016年  [査読有り]

     概要を見る

    This study investigated the effect of Mn adding on the T5 and T6 age-hardening behaviors of Al-(9.0–10.0)%Si-0.3%Mg (equivalent to A360 alloy) and Al-10%Si-2%Cu-0.3%Mg (equivalent to A383 alloy) die casting alloys using a hardness measurement, an electron probe micro analyzer (EPMA) and thermodynamic software. When 0.4%Mn was added, the hardness of the T5 heat-treated Al-Si-Mg die casting alloy increases because the Mn addition suppresses the formation of the π-Al8FeMg3Si6 phase during solidification and distributes Mg into the α solid solution. This mechanism named as π-phase suppression mechanism promotes precipitation strengthening. In the T6 heat treatment, the hardness of the alloys hardly increased when Mn was added. In the Al-Si-Cu-Mg alloys, the hardening by the 0.5%Mn addition was negligible compared to that of the Al-Si-Mg alloys regardless of T5 or T6 treatment. Therefore, the hardening by Mn addition is the characteristic phenomenon in the T5 heat-treated Al-Si-Mg high-pressure die casting alloy.

    DOI CiNii

  • Effect of Mn Addition on the Age-Hardening Behavior of an Al-(9-10)%Si-0.3%Mg Die Casting Alloy in T5 and T6 Heat Treatment

    Keita Fukasawa, Ryousuke Mohri, Tetsuo Ohtake, Tatsuya Inoue, Akihiro Kuroda, Hiroshi Kambe, Makoto Yoshida

    MATERIALS TRANSACTIONS   57 ( 6 ) 959 - 965  2016年  [査読有り]

     概要を見る

    This study investigated the effect of Mn adding on the T5 and T6 age-hardening behaviors of Al-(9.0-10.0)%Si-0.3%Mg (equivalent to A360 alloy) and Al-10% Si-2%Cu-0.3%Mg (equivalent to A383 alloy) die casting alloys using a hardness measurement, an electron probe micro analyzer (EPMA) and thermodynamic software. When 0.4% Mn was added, the hardness of the T5 heat-treated Al-Si-Mg die casting alloy increases because the Mn addition suppresses the formation of the pi-Al8FeMg3Si6 phase during solidification and distributes Mg into the a solid solution. This mechanism named as pi-phase suppression mechanism promotes precipitation strengthening. In the T6 heat treatment, the hardness of the alloys hardly increased when Mn was added. In the Al-Si-Cu-Mg alloys, the hardening by the 0.5% Mn addition was negligible compared to that of the Al-Si-Mg alloys regardless of T5 or T6 treatment. Therefore, the hardening by Mn addition is the characteristic phenomenon in the T5 heat-treated Al-Si-Mg high-pressure die casting alloy.

    DOI

  • Effect of Mn Addition on the Age-Hardening Behavior of an Al-(9-10)%Si-0.3%Mg Die Casting Alloy in T5 and T6 Heat Treatment

    Keita Fukasawa, Ryousuke Mohri, Tetsuo Ohtake, Tatsuya Inoue, Akihiro Kuroda, Hiroshi Kambe, Makoto Yoshida

    MATERIALS TRANSACTIONS   57 ( 6 ) 959 - 965  2016年  [査読有り]

     概要を見る

    This study investigated the effect of Mn adding on the T5 and T6 age-hardening behaviors of Al-(9.0-10.0)%Si-0.3%Mg (equivalent to A360 alloy) and Al-10% Si-2%Cu-0.3%Mg (equivalent to A383 alloy) die casting alloys using a hardness measurement, an electron probe micro analyzer (EPMA) and thermodynamic software. When 0.4% Mn was added, the hardness of the T5 heat-treated Al-Si-Mg die casting alloy increases because the Mn addition suppresses the formation of the pi-Al8FeMg3Si6 phase during solidification and distributes Mg into the a solid solution. This mechanism named as pi-phase suppression mechanism promotes precipitation strengthening. In the T6 heat treatment, the hardness of the alloys hardly increased when Mn was added. In the Al-Si-Cu-Mg alloys, the hardening by the 0.5% Mn addition was negligible compared to that of the Al-Si-Mg alloys regardless of T5 or T6 treatment. Therefore, the hardening by Mn addition is the characteristic phenomenon in the T5 heat-treated Al-Si-Mg high-pressure die casting alloy.

    DOI

  • Analysis of partially pulsating fatigue process on carbon steel with microstructural observation

    Hiroyuki Shimano, M. Khairi Faiz, Asato Hara, Kyoko Yoshizumi, Makoto Yoshida, Susumu Horibe

    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   651   83 - 88  2016年01月  [査読有り]

     概要を見る

    Pulsating low-cycle fatigue processes, up to the present, have been divided into three states: the transient state, steady state, and accelerating state of ratcheting. In our previous work, we suggested that fatigue behavior of pulsating fatigue process should be classified into five stages in which the plastic strain amplitude and the ratcheting strain rate are plotted on the X and Y axis, respectively. In this study, at the condition of R=-0.3 (partially pulsating fatigue), the change in the plastic strain amplitude and ratcheting strain rate for each cycle to failure was examined on AISI 1025 carbon steel. The dislocation substructure was examined using transmission electron microscopy (TEM) for each stage, except for stage I. It was also demonstrated that the fatigue process can be divided into five stages: stage I corresponds to the un-pinning of dislocations from the Cottrell atmosphere and propagation of the Luders band. Stage II corresponds to the restriction of dislocation movement by dislocation tangles. Stage III corresponds to the formation of dislocation cells. Stage IV corresponds to the promotion of the to-and-fro (back-and-forth) motion of dislocations by a re-arrangement of the dislocations in the cells. Stage V corresponds to the release of dislocation movement by the collapse of dislocation cells. (C) 2015 Elsevier B.V. All rights reserved.

    DOI

  • Analysis of partially pulsating fatigue process on carbon steel with microstructural observation

    Hiroyuki Shimano, M. Khairi Faiz, Asato Hara, Kyoko Yoshizumi, Makoto Yoshida, Susumu Horibe

    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   651   83 - 88  2016年01月  [査読有り]

     概要を見る

    Pulsating low-cycle fatigue processes, up to the present, have been divided into three states: the transient state, steady state, and accelerating state of ratcheting. In our previous work, we suggested that fatigue behavior of pulsating fatigue process should be classified into five stages in which the plastic strain amplitude and the ratcheting strain rate are plotted on the X and Y axis, respectively. In this study, at the condition of R=-0.3 (partially pulsating fatigue), the change in the plastic strain amplitude and ratcheting strain rate for each cycle to failure was examined on AISI 1025 carbon steel. The dislocation substructure was examined using transmission electron microscopy (TEM) for each stage, except for stage I. It was also demonstrated that the fatigue process can be divided into five stages: stage I corresponds to the un-pinning of dislocations from the Cottrell atmosphere and propagation of the Luders band. Stage II corresponds to the restriction of dislocation movement by dislocation tangles. Stage III corresponds to the formation of dislocation cells. Stage IV corresponds to the promotion of the to-and-fro (back-and-forth) motion of dislocations by a re-arrangement of the dislocations in the cells. Stage V corresponds to the release of dislocation movement by the collapse of dislocation cells. (C) 2015 Elsevier B.V. All rights reserved.

    DOI

  • Development of an Elasto-Viscoplastic Constitutive Equation for an Al-Mg Alloy Undergoing a Tensile Test during Partial Solidification

    Ryosuke Takai, Akira Matsushita, Shogo Yanagida, Koichiro Nakamura, Makoto Yoshida

    MATERIALS TRANSACTIONS   56 ( 8 ) 1233 - 1241  2015年

     概要を見る

    Predicting hot tearing during direct chill casting using thermal stress analysis requires constitutive equations in both semi-solid state and below the solidus of the alloy. However, numerous difficulties have been hindered constitutive equations used heretofore for hot tearing predictions. (1) Testing methods for obtaining material constants were inappropriate. First, the elastic strain reversibility was unconfirmed. Second, a flat distribution of temperature in the specimen gauge length was not guaranteed. Third, strain was measured not from local strain but from cross-head displacement. Fourth, the melt-back phenomenon was unavoidable in test during partial remelting because of homogenization of the segregation structure. (2) Temperature dependence of the strain-rate sensitivity of stress was not considered. (3) Some material constants were inferred, not obtained experimentally. This study developed elasto-viscoplastic constitutive equations (Hooke's and viscoplastic Norton-Hoff laws) for partially solidified state and below the solidus. To obtain material constants experimentally, two tensile tests for which issue (1) was addressed were conducted using Al-5 mass%Mg alloy. They were a tensile test after partial solidification and high-temperature tensile test with high-frequency induction coil. After the temperature dependence of elastic and viscoplastic properties was investigated, material constants were obtained and were compared with those obtained using earlier testing methods.

    DOI CiNii

  • Development of an Elasto-Viscoplastic Constitutive Equation for an Al-Mg Alloy Undergoing a Tensile Test during Partial Solidification

    Takai Ryosuke, Matsushita Akira, Yanagida Shogo, Nakamura Koichiro, Yoshida Makoto

    MATERIALS TRANSACTIONS   0 ( 0 )  2015年

     概要を見る

    Predicting hot tearing during direct chill casting using thermal stress analysis requires constitutive equations in both semi-solid state and below the solidus of the alloy. However, numerous difficulties have been hindered constitutive equations used heretofore for hot tearing predictions. (1) Testing methods for obtaining material constants were inappropriate. First, the elastic strain reversibility was unconfirmed. Second, a flat distribution of temperature in the specimen gauge length was not guaranteed. Third, strain was measured not from local strain but from cross-head displacement. Fourth, the melt-back phenomenon was unavoidable in test during partial remelting because of homogenization of the segregation structure. (2) Temperature dependence of the strain-rate sensitivity of stress was not considered. (3) Some material constants were inferred, not obtained experimentally. This study developed elasto-viscoplastic constitutive equations (Hooke&#039;s and viscoplastic Norton-Hoff laws) for partially solidified state and below the solidus. To obtain material constants experimentally, two tensile tests for which issue (1) was addressed were conducted using Al-5 mass%Mg alloy. They

    CiNii

  • Development of an Elasto-Viscoplastic Constitutive Equation for an Al-Mg Alloy Undergoing a Tensile Test during Partial Solidification

    Ryosuke Takai, Akira Matsushita, Shogo Yanagida, Koichiro Nakamura, Makoto Yoshida

    MATERIALS TRANSACTIONS   56 ( 8 ) 1233 - 1241  2015年  [査読有り]

     概要を見る

    Predicting hot tearing during direct chill casting using thermal stress analysis requires constitutive equations in both semi-solid state and below the solidus of the alloy. However, numerous difficulties have been hindered constitutive equations used heretofore for hot tearing predictions. (1) Testing methods for obtaining material constants were inappropriate. First, the elastic strain reversibility was unconfirmed. Second, a flat distribution of temperature in the specimen gauge length was not guaranteed. Third, strain was measured not from local strain but from cross-head displacement. Fourth, the melt-back phenomenon was unavoidable in test during partial remelting because of homogenization of the segregation structure. (2) Temperature dependence of the strain-rate sensitivity of stress was not considered. (3) Some material constants were inferred, not obtained experimentally. This study developed elasto-viscoplastic constitutive equations (Hooke's and viscoplastic Norton-Hoff laws) for partially solidified state and below the solidus. To obtain material constants experimentally, two tensile tests for which issue (1) was addressed were conducted using Al-5 mass%Mg alloy. They were a tensile test after partial solidification and high-temperature tensile test with high-frequency induction coil. After the temperature dependence of elastic and viscoplastic properties was investigated, material constants were obtained and were compared with those obtained using earlier testing methods.

    DOI

  • Effect of stacking fault energy on pulsating fatigue behavior for fcc metals under the fully repeated loading

    S. Sakaki, M. Yoshida, S. Horibe

    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   607   1 - 5  2014年06月  [査読有り]

     概要を見る

    In previous studies, the relationship between stacking fault energy (SFE) and the fatigue process has been examined under the fully reversed loading in which ratcheting does not occur. In this study, under the fully repeated loading, for pure Ni (128 mJ/m(2)), pure Cu (40 mJ/m(2)) and Cu-35 wt% Zn (11.5 mJ/m(2)) with different SFEs, the effect of fatigue damage and ratcheting damage on fatigue life was investigated. It was observed that for pure Ni, compared with pure Cu and Cu-35 wt% Zn, ratcheting damage is dominant. For Cu-35 wt% Zn, compared with pure Ni and pure Cu, fatigue damage is dominant. For pure Cu, both ratcheting damage and fatigue damage are dominant (mixed type). Thus, it was observed for the first time that high SFE tends to enhance ratcheting damage and low SFE tends to promote fatigue damage under the fully repeated loading. (C) 2014 Elsevier B.V. All rights reserved.

    DOI

  • Verification of the Simulated Residual Stress in the Cross Section of Gray Cast Iron Stress Lattice Shape Casting via Thermal Stress Analysis

    Yuichi Motoyama, Daiki Inukai, Toshimitsu Okane, Makoto Yoshida

    METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE   45A ( 4 ) 2315 - 2325  2014年04月

     概要を見る

    The residual stresses in the thick part of the stress lattice shape casting consist of the residual stress due to the temperature differential between the thick part and the thin part and the residual stress due to the temperature differential in the radial direction of the thick part. In this study, the gray cast iron stress lattice shape castings were cast and both types of the residual stresses were separately measured. Thermal stress analyses based on the casting experiment were conducted. Next, the measurements in this study were compared with both types of the simulated residual stresses. The thermal stress analyses estimated the residual stress due to the temperature difference in the radial direction of the thick part to be significantly higher than the measurement, although the residual stress due to the temperature difference between the thick part and the thin part was successfully predicted within a 10 pct error. Thus, this study suggested the introduction of the mechanical melting temperature, above which the very low yield stress is applied conveniently to describe the losses of the deformation resistance of the casting, to more accurately predict the residual stress due to the temperature difference in the radial direction of the thick part. From the verification of the suggested model, this study demonstrated that the conventional elasto-plastic model must introduce the mechanical melting temperature to predict the residual stress due to the temperature difference in the radial direction of the thick part and thus the overall residual stress in the stress lattice. (C) The Minerals, Metals & Materials Society and ASM International 2013

    DOI

  • Verification of the Simulated Residual Stress in the Cross Section of Gray Cast Iron Stress Lattice Shape Casting via Thermal Stress Analysis

    Yuichi Motoyama, Daiki Inukai, Toshimitsu Okane, Makoto Yoshida

    METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE   45A ( 4 ) 2315 - 2325  2014年04月  [査読有り]

     概要を見る

    The residual stresses in the thick part of the stress lattice shape casting consist of the residual stress due to the temperature differential between the thick part and the thin part and the residual stress due to the temperature differential in the radial direction of the thick part. In this study, the gray cast iron stress lattice shape castings were cast and both types of the residual stresses were separately measured. Thermal stress analyses based on the casting experiment were conducted. Next, the measurements in this study were compared with both types of the simulated residual stresses. The thermal stress analyses estimated the residual stress due to the temperature difference in the radial direction of the thick part to be significantly higher than the measurement, although the residual stress due to the temperature difference between the thick part and the thin part was successfully predicted within a 10 pct error. Thus, this study suggested the introduction of the mechanical melting temperature, above which the very low yield stress is applied conveniently to describe the losses of the deformation resistance of the casting, to more accurately predict the residual stress due to the temperature difference in the radial direction of the thick part. From the verification of the suggested model, this study demonstrated that the conventional elasto-plastic model must introduce the mechanical melting temperature to predict the residual stress due to the temperature difference in the radial direction of the thick part and thus the overall residual stress in the stress lattice. (C) The Minerals, Metals & Materials Society and ASM International 2013

    DOI

  • THE DYNAMIC BEHAVIOR OF A STEEL PIPE SHEET PILE FOUNDATION IN A LIQUEFIED LAYER DURING AN EARTHQUAKE

    TRUNG Nguyen Thanh, KIYOMIYA Osamu, YOSHIDA Makoto

    Journal of JSCE   2 ( 1 ) 116 - 135  2014年

     概要を見る

    Various forms of damage to the bridge foundation structure in the revetment along riverbanks and sea coasts caused by liquefaction had been observed during past earthquakes. Several studies on liquefaction using physical model tests and numerical analysis have been conducted in recent years. However, few studies have investigated the seismic behavior of the foundation in a revetment with a slope. In strong earthquakes, the sloped ground is expected to be unstable, and lateral spreading of the ground may occur simultaneously with the loss of soil strength in the liquefaction layer. Moreover, in the seismic design specification (JRA-2002) of the bridge, the liquefaction verification of the foundation is stipulated for a flat ground but not for a sloped ground. Therefore, the effect of the lateral pressure of the liquefaction layer on the foundation in the revetment must be investigated further. This study aims to investigate the dynamic behavior of a steel pipe sheet pile (SPSP) foundation of a cable-stayed bridge and its effect on the performance of the superstructure in the revetment with a slope. A 1-G shaking table test with a scale of 1:60 was conducted on a flat model and a slope model of 15°. In addition, 2-D numerical modeling was applied in an effective stress analysis method that was used on a multi-spring model and cocktail glass model. The differences in the dynamic responses between the two models clearly illustrate the significant effect of the ground slope on the seismic behavior of the SPSP foundation and superstructure.

    CiNii

  • Analysis of a pulsating fatigue process on carbon steel with different carbide shapes

    Asato Hara, Rumi Kitazawa, Makoto Yoshida, Susumu Horibe

    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   590   218 - 223  2014年01月

     概要を見る

    In the pulsating fatigue process, the relationship between cyclic softening (hardening) and ratcheting should be clarified from the perspective of the practical use of the mechanical parts. However, most previous reports have been limited to predicting of ratcheting curves using constitutive equations. Consequently, there are few qualitative discussions regarding the relationship between cyclic softening (hardening) and ratcheting for changes in the number of cycles. In this study, the plastic strain amplitude, which represents the fatigue damage, is plotted on the X axis and the ratcheting strain rate is plotted on the Y axis, cycle by cycle, to investigate the fatigue and ratcheting damage simultaneously. This figure is known as the SH curve after Dr. Susumu Horibe. As an example, the pulsating fatigue processes of JIS S25C (AISI 1025) with three different carbide shape types are analyzed under the conditions that the engineering stress amplitudes are over their lower yield points. Using SH curves it is shown that regardless of the shape of the carbide, the fatigue behavior should be divided into five stages. Stage I corresponds to the un-pinning of dislocations from the Cottrell atmosphere. Stage II corresponds to the propagation of the Luders band. Stage III corresponds to an increase in short range dislocation movement during the formation of cellular structures due to multiple slip locations. Stage IV corresponds to the fracture of the cellular structure due to an increase in the true stress. Stage V corresponds to crack initiation and propagation. The plastic strain amplitude increases with the number of cycles, while the ratcheting strain rate decreases, especially in stage III; this phenomenon has never been reported previously. At this stage, the microstructure was observed by TEM. It is also determined that in this case, the maximum stress is over the lower yield point, and the ratcheting strain rate is dominant over the fatigue life. (C) 2013 Elsevier B.V. All rights reserved.

    DOI

  • Analysis of a pulsating fatigue process on carbon steel with different carbide shapes

    Asato Hara, Rumi Kitazawa, Makoto Yoshida, Susumu Horibe

    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   590   218 - 223  2014年01月  [査読有り]

     概要を見る

    In the pulsating fatigue process, the relationship between cyclic softening (hardening) and ratcheting should be clarified from the perspective of the practical use of the mechanical parts. However, most previous reports have been limited to predicting of ratcheting curves using constitutive equations. Consequently, there are few qualitative discussions regarding the relationship between cyclic softening (hardening) and ratcheting for changes in the number of cycles. In this study, the plastic strain amplitude, which represents the fatigue damage, is plotted on the X axis and the ratcheting strain rate is plotted on the Y axis, cycle by cycle, to investigate the fatigue and ratcheting damage simultaneously. This figure is known as the SH curve after Dr. Susumu Horibe. As an example, the pulsating fatigue processes of JIS S25C (AISI 1025) with three different carbide shape types are analyzed under the conditions that the engineering stress amplitudes are over their lower yield points. Using SH curves it is shown that regardless of the shape of the carbide, the fatigue behavior should be divided into five stages. Stage I corresponds to the un-pinning of dislocations from the Cottrell atmosphere. Stage II corresponds to the propagation of the Luders band. Stage III corresponds to an increase in short range dislocation movement during the formation of cellular structures due to multiple slip locations. Stage IV corresponds to the fracture of the cellular structure due to an increase in the true stress. Stage V corresponds to crack initiation and propagation. The plastic strain amplitude increases with the number of cycles, while the ratcheting strain rate decreases, especially in stage III; this phenomenon has never been reported previously. At this stage, the microstructure was observed by TEM. It is also determined that in this case, the maximum stress is over the lower yield point, and the ratcheting strain rate is dominant over the fatigue life. (C) 2013 Elsevier B.V. All rights reserved.

    DOI

  • A verification of the thermal stress analysis, including the furan sand mold, used to predict the thermal stress in castings

    Yuichi Motoyama, Yuki Inoue, Gota Saito, Makoto Yoshida

    JOURNAL OF MATERIALS PROCESSING TECHNOLOGY   213 ( 12 ) 2270 - 2277  2013年12月  [査読有り]

     概要を見る

    The restraint exerted on a casting by a furan sand mold on the casting and the contraction of the casting during cooling was dynamically and simultaneously measured using a device that we developed. The measurements were compared during cooling with thermal stress analyses. The thermal stress analyses were based on the representative mechanical models for the furan sand mold, i.e., the elastic and elasto-plastic models used in previous studies. The comparison demonstrated that the elasto-plastic model simulates the restraint force more accurately than the elastic model. In the thermal stress analysis, it was important to describe the development of inelastic deformation and the fracture of the sand mold. However, the simulated restraint force was still twice as large as the measured force even in the elastoplastic model. This error is most likely attributable to using the temperature-independent mechanical properties of the furan sand mold and the mechanical model of the casting alloy, which neglected the viscoplasticity at high temperature in the thermal stress analysis. (C) 2013 Elsevier B.V. All rights reserved.

    DOI

  • A verification of the thermal stress analysis, including the furan sand mold, used to predict the thermal stress in castings

    Yuichi Motoyama, Yuki Inoue, Gota Saito, Makoto Yoshida

    JOURNAL OF MATERIALS PROCESSING TECHNOLOGY   213 ( 12 ) 2270 - 2277  2013年12月  [査読有り]

     概要を見る

    The restraint exerted on a casting by a furan sand mold on the casting and the contraction of the casting during cooling was dynamically and simultaneously measured using a device that we developed. The measurements were compared during cooling with thermal stress analyses. The thermal stress analyses were based on the representative mechanical models for the furan sand mold, i.e., the elastic and elasto-plastic models used in previous studies. The comparison demonstrated that the elasto-plastic model simulates the restraint force more accurately than the elastic model. In the thermal stress analysis, it was important to describe the development of inelastic deformation and the fracture of the sand mold. However, the simulated restraint force was still twice as large as the measured force even in the elastoplastic model. This error is most likely attributable to using the temperature-independent mechanical properties of the furan sand mold and the mechanical model of the casting alloy, which neglected the viscoplasticity at high temperature in the thermal stress analysis. (C) 2013 Elsevier B.V. All rights reserved.

    DOI

  • Influence of Compressive Pre-Strain on Tensile Fatigue Life in Carbon Steel S45C

    Hirokazu Tamaki, Rumi Kitazawa, Makoto Yoshida, Susumu Horibe

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   77 ( 11 ) 514 - 521  2013年11月  [査読有り]

     概要を見る

    For S45C carbon steel with three heat treatments, pulsating tension tests were carried out under controlled stress condition. The effect of compressive pre-strain, Bauschinger effect and controlling factors on fatigue life were examined. The following results were obtained. The decrease of pulsating fatigue life was caused by three factors, i.e. increase of the total plastic strain amplitude, cyclic plastic strain amplitude and cyclic creep rate. The increase of Bauschinger strain led to the increase of the value of the three factors. Then it resulted in shorter fatigue life. In order to examine the cyclic stress conditions to the fatigue life, the stress ratio was defined as the ratio of maximum cyclic stress to yield stress of each material. Bauschinger strain was occurred when the stress ratio was under the threshold for each material. As the result, cyclic plastic strain amplitude and cyclic creep rate were increased and then pulsating fatigue life was reduced.

    DOI

  • 炭素鋼S45C の片振り疲労寿命に及ぼす圧縮予歪の影響

    玉木 裕和, 北澤 留弥, 吉田 誠, 堀部 進

    日本金属学会誌   77 ( 11 ) 503 - 508  2013年11月  [査読有り]

    DOI

  • Effect of Creep and Cyclic Loading on Pulsating Fatigue Behavior for Various Ti Alloys under Stress Ratio R=0

    Gen-ichiro Nagatani, Rumi Kitazawa, Makoto Yoshida, Susumu Horibe

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   77 ( 10 ) 455 - 460  2013年10月

     概要を見る

    It is well known that creep at room temperature remarkably occurs in alpha-Ti alloys. Cyclic creep also appears. Moreover, Ti alloys have different crystal structures and various mechanical properties. Although the cyclic creep behavior and the cyclic softening behavior have been studied, integrated effect of them on fatigue life has not been clarified yet. In this study, fatigue behavior under stress ratio R=0, on Ti alloys of three crystal structures, is investigated. Influence of the cyclic creep and fatigue damage, and influence of the crystal structure to fatigue life are examined. As the results, it is found that as to the alpha-Ti, creep is the dominant damage factor. On the other hand, as to the beta-Ti alloy, fatigue is the dominant damage factor. As to the alpha + beta-Ti alloy, both creep and fatigue are the dominant damage factors (intermediate type). Furthermore, it is found that the area ratio and grain diameter of alpha phase, the spacing between different phases, should influence on cyclic creep strain rate.

    DOI

  • Effect of Twinning and Aging Treatment on Fatigue Process of ZK60 Magnesium Alloys

    Shunsuke Taniguchi, Rumi Kitazawa, Yoshihisa Tanaka, Makoto Yoshida, Susumu Horibe

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   77 ( 10 ) 448 - 454  2013年10月

     概要を見る

    For magnesium alloy ZK60 with different heat treatments, controlled plastic strain amplitude fatigue tests were conducted. Effects of twinning and aging treatments on fatigue process were investigated by analyzing the second derivative of hysteresis half-loop. It is found that during compression the convex peak appears at the strain where twinning begins. It is also found that during tension the convex peak appears at the strain where detwinning begins and the concave peak appears at the strain where slip begins to be predominant. Analyzing the strain at the convex peak in compression at the plastic strain amplitude of 6 x 10(-3), for solution treated material and over-aged material twinning hardens with increasing cycle. On the other hand, for T6 material twinning softens from 5 cycle to N-f/5 cycle and then hardens from N-f/5 cycle to N-f/2 cycle. It was suggested that residual twins cause twinning hardening. It was also suggested that cut and dissolution of rod-like precipitates should cause twinning softening. Due to different states of precipitates of materials, the twinning softening appeared for only T6 material at the plastic strain amplitude of 6 x 10(-3). Moreover, the softening were not found for T6 material under the plastic strain amplitude of 4 x 10(-3).

    DOI

  • 各種チタン合金の完全片振り疲労拳動に及ぼすクリープと荷重繰り返しの影響

    長谷 玄一郎, 北澤 留弥, 吉田 誠, 堀部 進

    日本金屬學會誌   77 ( 10 ) 455 - 460  2013年10月  [査読有り]

     概要を見る

    It is well known that creep at room temperature remarkably occurs in alpha-Ti alloys. Cyclic creep also appears. Moreover, Ti alloys have different crystal structures and various mechanical properties. Although the cyclic creep behavior and the cyclic softening behavior have been studied, integrated effect of them on fatigue life has not been clarified yet. In this study, fatigue behavior under stress ratio R=0, on Ti alloys of three crystal structures, is investigated. Influence of the cyclic creep and fatigue damage, and influence of the crystal structure to fatigue life are examined. As the results, it is found that as to the alpha-Ti, creep is the dominant damage factor. On the other hand, as to the beta-Ti alloy, fatigue is the dominant damage factor. As to the alpha+beta-Ti alloy, both creep and fatigue are the dominant damage factors (intermediate type). Furthermore, it is found that the area ratio and grain diameter of alpha phase, the spacing between different phases, should influence on cyclic creep strain rate.

    DOI CiNii

  • マグネシウム合金ZK60の疲労過程に及ぼす双晶変形と時効の影響

    谷口 俊介, 北澤 留弥, 田中 義久, 吉田 誠, 堀部 進

    日本金屬學會誌   77 ( 10 ) 448 - 454  2013年10月

     概要を見る

    For magnesium alloy ZK60 with different heat treatments, controlled plastic strain amplitude fatigue tests were conducted. Effects of twinning and aging treatments on fatigue process were investigated by analyzing the second derivative of hysteresis half-loop. It is found that during compression the convex peak appears at the strain where twinning begins. It is also found that during tension the convex peak appears at the strain where detwinning begins and the concave peak appears at the strain where slip begins to be predominant. Analyzing the strain at the convex peak in compression at the plastic strain amplitude of 6×10−3, for solution treated material and over-aged material twinning hardens with increasing cycle. On the other hand, for T6 material twinning softens from 5 cycle to Nf/5 cycle and then hardens from Nf/5 cycle to Nf/2 cycle. It was suggested that residual twins cause twinning hardening. It was also suggested that cut and dissolution of rod-like precipitates should cause twinning softening. Due to different states of precipitates of materials, the twinning softening appeared for only T6 material at the plastic strain amplitude of 6×10−3. Moreover, the sof

    DOI CiNii

  • Relationship between Masing behavior and dislocation structure of AISI 1025 under different stress ratios in cyclic deformation

    E. Watanabe, T. Asao, M. Toda, M. Yoshida, S. Horibe

    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   582   55 - 62  2013年10月  [査読有り]

     概要を見る

    In a previous study, the hypothesis that dislocation arrangements do not change while Masing behavior occurs in materials was proposed. However, by validating the hypothesis via TEM observation, the authors incidentally found that dislocation structures are not always the same during Masing behavior. Therefore, the aim of this work was to understand the relationship between Masing behavior and dislocation structures using AISI 1025 under stress-controlled fatigue testing. In addition, to understand the more systematical relationship between Masing behavior and dislocation structures, three stress ratios, R=-1, -0.3 and 0, were applied, and each cyclic stress-strain curve (CSSC) was obtained for the first time. To investigate the Masing behavior, a new analytical method was proposed due to the difficulty of evaluating hysteresis loops with mean stress using previous methods. Based on the results, the dislocation structures are observed for the first time to determine whether the dislocation structures are same when Masing behavior occurs. As a result, the dislocation structures that exhibited Masing behavior were categorized into two types: (i) fully homogeneous dislocation structures and (ii) dislocation structures with a dual microstructure composed of cell and loop-patch structures, each of which exhibits a different volume fraction. The relationship between the CSSCs under stress ratios of R=-0.3 and 0 and the dislocation structures was examined. There are B and C regions in the CSSCs under stress ratios of R=-0.3 and 0. It was found that each dislocation structures shows loop-patch and cell structures. At the end of region C, a collapsed cell structure was observed. (C) 2013 Elsevier B.V. All rights reserved.

    DOI

  • マグネシウム合金ZK60の疲労過程に及ぼす双晶変形と時効の影響

    谷口 俊介, 北澤 留弥, 田中 義久, 吉田 誠, 堀部 進

    日本金屬學會誌   77 ( 10 ) 448 - 454  2013年10月  [査読有り]

     概要を見る

    For magnesium alloy ZK60 with different heat treatments, controlled plastic strain amplitude fatigue tests were conducted. Effects of twinning and aging treatments on fatigue process were investigated by analyzing the second derivative of hysteresis half-loop. It is found that during compression the convex peak appears at the strain where twinning begins. It is also found that during tension the convex peak appears at the strain where detwinning begins and the concave peak appears at the strain where slip begins to be predominant. Analyzing the strain at the convex peak in compression at the plastic strain amplitude of 6×10−3, for solution treated material and over-aged material twinning hardens with increasing cycle. On the other hand, for T6 material twinning softens from 5 cycle to Nf/5 cycle and then hardens from Nf/5 cycle to Nf/2 cycle. It was suggested that residual twins cause twinning hardening. It was also suggested that cut and dissolution of rod-like precipitates should cause twinning softening. Due to different states of precipitates of materials, the twinning softening appeared for only T6 material at the plastic strain amplitude of 6×10−3. Moreover, the softening were not found for T6 material under the plastic strain amplitude of 4×10−3.

    DOI

  • Effect of Creep and Cyclic Loading on Pulsating Fatigue Behavior for Various Ti Alloys under Stress Ratio R=0

    Gen-ichiro Nagatani, Rumi Kitazawa, Makoto Yoshida, Susumu Horibe

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   77 ( 10 ) 455 - 460  2013年10月  [査読有り]

     概要を見る

    It is well known that creep at room temperature remarkably occurs in alpha-Ti alloys. Cyclic creep also appears. Moreover, Ti alloys have different crystal structures and various mechanical properties. Although the cyclic creep behavior and the cyclic softening behavior have been studied, integrated effect of them on fatigue life has not been clarified yet. In this study, fatigue behavior under stress ratio R=0, on Ti alloys of three crystal structures, is investigated. Influence of the cyclic creep and fatigue damage, and influence of the crystal structure to fatigue life are examined. As the results, it is found that as to the alpha-Ti, creep is the dominant damage factor. On the other hand, as to the beta-Ti alloy, fatigue is the dominant damage factor. As to the alpha + beta-Ti alloy, both creep and fatigue are the dominant damage factors (intermediate type). Furthermore, it is found that the area ratio and grain diameter of alpha phase, the spacing between different phases, should influence on cyclic creep strain rate.

    DOI

  • Effect of sand mold models on the simulated mold restraint force and the contraction of the casting during cooling in green sand molds

    Yuki Inoue, Yuichi Motoyama, Hiroki Takahashi, Keita Shinji, Makoto Yoshida

    JOURNAL OF MATERIALS PROCESSING TECHNOLOGY   213 ( 7 ) 1157 - 1165  2013年07月  [査読有り]

     概要を見る

    In this work, the JIS AD12.1 (almost the same as A383.1) aluminum alloy was cast in a green sand mold. The restraint force from the sand mold and the contraction of the casting were measured dynamically from the solidifying temperature to the shake-out temperature using a dedicated device. Then, FEM (Finite Element Method) thermal stress analyses of the experiment were performed. The analyses adopted four types of representative constitutive equations and the mechanical properties of the green sand mold, which were quoted from previous research articles. As verification, this study dynamically compared the simulated restraint force and the contraction of casting with measured results and examined which mechanical properties are important for expressing the restraint force of the sand mold. This verification is the first attempt in the world. As a result, the simulated restraint force was estimated to be over ten times as large as the measured result in each type of equation because the yield stress of the sand mold used in our experiment was lower than those quoted from previous studies. The yield stress measured by a uniaxial compression test was 1/20 of the quoted values. When the measured yield stress was adopted in the simulation, the simulated restraint force and contraction approached the measured results. The yield stress of the sand mold was a dominant factor in the restraint force simulated by the thermal stress analyses. The yield stress of the green sand mold used in the casting process should be measured to predict the residual stress using FEM thermal stress analyses. (C) 2013 Elsevier B.V. All rights reserved,

    DOI

  • Effect of sand mold models on the simulated mold restraint force and the contraction of the casting during cooling in green sand molds

    Yuki Inoue, Yuichi Motoyama, Hiroki Takahashi, Keita Shinji, Makoto Yoshida

    JOURNAL OF MATERIALS PROCESSING TECHNOLOGY   213 ( 7 ) 1157 - 1165  2013年07月  [査読有り]

     概要を見る

    In this work, the JIS AD12.1 (almost the same as A383.1) aluminum alloy was cast in a green sand mold. The restraint force from the sand mold and the contraction of the casting were measured dynamically from the solidifying temperature to the shake-out temperature using a dedicated device. Then, FEM (Finite Element Method) thermal stress analyses of the experiment were performed. The analyses adopted four types of representative constitutive equations and the mechanical properties of the green sand mold, which were quoted from previous research articles. As verification, this study dynamically compared the simulated restraint force and the contraction of casting with measured results and examined which mechanical properties are important for expressing the restraint force of the sand mold. This verification is the first attempt in the world. As a result, the simulated restraint force was estimated to be over ten times as large as the measured result in each type of equation because the yield stress of the sand mold used in our experiment was lower than those quoted from previous studies. The yield stress measured by a uniaxial compression test was 1/20 of the quoted values. When the measured yield stress was adopted in the simulation, the simulated restraint force and contraction approached the measured results. The yield stress of the sand mold was a dominant factor in the restraint force simulated by the thermal stress analyses. The yield stress of the green sand mold used in the casting process should be measured to predict the residual stress using FEM thermal stress analyses. (C) 2013 Elsevier B.V. All rights reserved,

    DOI

  • 鋳物人 岩堀弘昭

    岩堀 弘昭, 吉田 誠

    鋳造工学 = Journal of Japan Foundry Engineering Society   85 ( 7 ) 470 - 471  2013年07月

    CiNii

  • Tensile Rate Dependency of Mechanical Properties of Inconel 718 Nickel-Based Superalloy around Solidus Temperature

    Shota Ogino, Tsubasa Ohashi, Naoki Kasuya, Makoto Yoshida

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   77 ( 5 ) 170 - 173  2013年05月

     概要を見る

    Nickel-based superalloys have been applied to gas turbine and aircraft jet engine parts due to superior high temperature strength and corrosion resistance. However, casting defect such as solidification cracking often occurs. In order to increase productivity of precision casting and various shape casting processes, predicting the occurrence of solidification cracking by using CAE (Computer Aided Engineering) should be essential. Therefore, it is necessary to obtain mechanical properties in the state of solid-liquid coexistence.
    In the previous reports, high temperature mechanical properties were examined but tensile rate dependency wasn't examined. In this study, high temperature (around solidus temperature) mechanical properties and tensile rate dependency of their alloy were examined by using originally developed tensile test.

    DOI

  • Ni基超合金 Inconel 718 の固相線温度近傍における力学特性値の引張速度依存性

    荻野 章太, 大橋 翼, 粕谷 直生, 吉田 誠

    日本金屬學會誌   77 ( 5 ) 170 - 173  2013年05月

     概要を見る

    Nickel-based superalloys have been applied to gas turbine and aircraft jet engine parts due to superior high temperature strength and corrosion resistance. However, casting defect such as solidification cracking often occurs. In order to increase productivity of precision casting and various shape casting processes, predicting the occurrence of solidification cracking by using CAE (Computer Aided Engineering) should be essential. Therefore, it is necessary to obtain mechanical properties in the state of solid-liquid coexistence.    In the previous reports, high temperature mechanical properties were examined but tensile rate dependency wasn&#039;t examined. In this study, high temperature (around solidus temperature) mechanical properties and tensile rate dependency of their alloy were examined by using originally developed tensile test.

    DOI CiNii

  • Ni基超合金 Inconel 718 の固相線温度近傍における力学特性値の引張速度依存性

    荻野 章太, 大橋 翼, 粕谷 直生, 吉田 誠

    日本金屬學會誌   77 ( 5 ) 170 - 173  2013年05月  [査読有り]

     概要を見る

    Nickel-based superalloys have been applied to gas turbine and aircraft jet engine parts due to superior high temperature strength and corrosion resistance. However, casting defect such as solidification cracking often occurs. In order to increase productivity of precision casting and various shape casting processes, predicting the occurrence of solidification cracking by using CAE (Computer Aided Engineering) should be essential. Therefore, it is necessary to obtain mechanical properties in the state of solid-liquid coexistence.    In the previous reports, high temperature mechanical properties were examined but tensile rate dependency wasn't examined. In this study, high temperature (around solidus temperature) mechanical properties and tensile rate dependency of their alloy were examined by using originally developed tensile test.

    DOI

  • 半凝固状態における引張試験を用いたAl–Mg系合金の弾粘塑性構成式の構築

    高井 量資, 松下 彬, 柳田 章吾, 中村 浩一郎, 吉田 誠

    軽金属   63 ( 9 ) 310 - 317  2013年

     概要を見る

    In order to predict the hot tearing during DC casting by using thermal stress analysis, constitutive equations in both solid–liquid coexisting and below solidus of alloy are inevitable. However, previous constitutive equations used in hot tearing predictions have no less than one problem as follows. (1) Testing methods of obtaining material constants weren't appropriate. Firstly, elastic strain reversibility was unconfirmed. Secondary, flat distribution of temperature in gauge length of specimen wasn't guaranteed. Thirdly, strain was measured from not local strain but cross head displacement. Fourth, the melt-back phenomenon was unavoidable in partial melting method which was caused by homogenization of segregation structure. (2) Temperature dependence of strain rate sensitivity of stress wasn't considered. (3) Some material constants were not obtained experimentally but guessed. In this study, elasto-viscoplastic constitutive equations (Hooke's and Norton's laws) for both partial solidification and below solidus were developed. In order to obtain material constants experimentally, two tensile tests which the problem (1) was solved were conducted using Al–5mass%Mg alloy. They were partial solidification tensile tests (above solidus) and high temperature tensile test with high frequency induction (below solidus). Then, temperature dependence of elastic, viscoplastic properties were investigated and material constants were obtained. Furthermore, they were compared with other previous testing methods.

    CiNii

  • 耐熱マグネシウム合金半凝固射出成形材の凝固割れ感受性評価

    藤井 敏男, 山本 元道, 篠崎 賢二, 三澤 亮太, 永井 淳嗣, 吉田 誠, 田中 達也

    軽金属   63 ( 6 ) 223 - 228  2013年

     概要を見る

    New tentative semi-solid injection molding machine for magnesium alloy which was able to control solid fraction from 0 to 30% was developed. The solidification cracking susceptibility of the heat-resistant magnesium alloy containing 4% Al and 3% Ca fabricated by semi-solid injection molding and die-casting were investigated. The critical strain for solidification cracking of the magnesium alloy was obtained by U-type hot cracking test using in-situ observation method. High temperature ductility curve between liquidus and solidus temperatures were compared with semi-solid injection molding and die-casting. As result, solidification cracking susceptibility of semi-solid injection molding process with solid fraction of 25% was better than that of die-casting.

    CiNii

  • グラウンドアンカーによる重力式岸壁の耐震補強に関する研究

    吉田 誠, 清宮 理

    土木学会論文集A1(構造・地震工学)   69 ( 1 ) 69 - 88  2013年

     概要を見る

    本研究では,グラウンドアンカーで補強された重力式岸壁の模型振動実験および有効応力解析による実験の再現解析を実施した.その結果,グラウンドアンカーで補強した場合,ケーソンの水平抵抗力が増加するとともに,基礎捨石の変形が抑制されることでケーソン変位が低減し,かつ基礎捨石層厚の違いによる岸壁の挙動の差異が小さくなった.また,地震時におけるアンカーの張力と伸びの関係は,履歴ループを描き非線形な特性を示した.さらに,有効応力解析において,アンカー張力の非線形特性を反映することで,岸壁の変形およびアンカー張力の再現性が向上した.

    CiNii

  • Al–Si–Cu系ダイカスト合金の半凝固状態の引張特性

    進士 啓太, 高橋 弘樹, 本山 雄一, 吉田 誠

    軽金属   63 ( 7 ) 253 - 259  2013年

     概要を見る

    True stress–true strain curve of JIS AD12.1 (A383.0) alloy was obtained by tensile test in the partial solidification state for predicting residual stress and distortion of aluminum castings. It was found that tensile strength in true stress–true strain curves decreased with increasing temperature and decreasing strain rate. In addition, most of true stress–true strain curves showed constant stress with increasing strain. Thus, the constitutive equation taking account of strain-rate-dependence and stress saturation in the partial solidification state should be used in the thermal-stress analysis during solidification. Material constants of Norton creep law of JIS AD12.1 alloy in the partial solidification state were successfully obtained for the first time in the world.

    CiNii

  • Investigation of the Dominating Mechanism of Fatigue Life for Various Alloys with CSSC on R=0 and-1

    Ayumi Komori, Eriko Watanabe, Momoko Toda, Rumi Kitazawa, Makoto Yoshida, Susumu Horibe

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   77 ( 8 ) 295 - 299  2013年  [査読有り]

     概要を見る

    Most studies on CSSC (cyclic stress-strain curve) have been conducted in the condition of the stress ratio R=-1. There are few reports on the effect of mean stress on CSSC. In this study, the stress-controlled fatigue tests under R=0 and -1 were performed on JIS S25C (AISI 1020), IF steel, A2024-T6, A6061-T6 and Ti-6Al-4V alloys. CSSCs of R=0 and -1 were compared. Creep strain (ratcheting strain) was also measured to investigate dominating mechanism of fatigue life of these alloys. It was found that the effect of mean stress on CSSC was different with each alloy. The dominating mechanism of JIS S25C and IF steel was creep strain. However, the dominating mechanism of A2024-T6 and A6061-T6 was plastic strain amplitude. The dominating mechanism of Ti-6Al-4V alloy was both creep strain and plastic strain amplitude. Thus, fatigue life reduction caused by mean stress in Ti-6Al-4V alloy was remarkably occurred than the other alloys.

    DOI

  • Numerical and experimental study on residual stress in gray cast iron stress lattice shape casting

    Yuichi Motoyama, Hiroki Takahashi, Toshimitsu Okane, Yoya Fukuda, Makoto Yoshida

    Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science   44 ( 7 ) 3261 - 3270  2013年

     概要を見る

    The prediction of residual stress in a stress lattice shape casting (stress lattice) has been conducted and discussed by some researchers via the Finite Element Method (FEM). However, most of the previous studies used the first-order tetrahedral element, which has poor analysis accuracy in problems including bending. The use of the first-order tetrahedral element makes the verification of these studies uncertain because the bending deformation essentially occurs in the stress lattice casting. This study first shows that the thermal stress analysis for the stress lattice should use the element that can represent the bending deformation in principle for bending of the thin parts. Second, the simulated residual stress was compared with the measured value. The thermal stress analysis successfully predicted the residual stress of the stress lattice casting with and 11 pct difference. In addition to the prediction of the residual stress, it is important from the viewpoint of the productivity of castings to reveal the effect of the shake-out temperature on the residual stress. However, in the previous studies, conclusions concerning the effect of the shake-out temperature on the residual stress were not consistent (i.e., the one study said the higher shake-out temperature decreased the residual stress, and another study said a higher shake-out temperature increased the residual stress). Therefore, the current study first discusses the reason for the inconsistent conclusions in the previous studies. Second, stress lattice castings were cast and shaken out at various shake-out temperatures. Then, the current study validated the effect of the shake-out temperature on the residual stress. Consequently, the experimental results supported the conclusion of Kasch and Mikelonis that the shake-out at higher temperature contributed to the increase of the residual stress in the casting. © The Minerals, Metals &amp
    Materials Society and ASM International 2013.

    DOI

  • Dynamic measurements of the load on castings and the contraction of castings during cooling in sand molds

    Yuichi Motoyama, Hiroki Takahashi, Yuki Inoue, Keita Shinji, Makoto Yoshida

    Journal of Materials Processing Technology   213 ( 2 ) 238 - 244  2013年  [査読有り]

     概要を見る

    The load on flange castings in sand molds was gradually increased beginning from the end of the solidification process until the final cooling stage. The maximum tensile load on the flange castings in furan sand molds was larger than that of the flange castings in green sand molds. With the furan sand mold, permanent deformation in the flange castings occurred beginning from the end of the solidification process until reaching a temperature of approximately 250°C. The mechanical interaction between the casting and the sand mold should be considered for more accurate stress calculations, particularly in furan sand molds. © 2012 Elsevier B.V.

    DOI

  • Al–Si–Cu系ダイカスト合金の半凝固状態の引張特性

    進士 啓太, 高橋 弘樹, 本山 雄一, 吉田 誠

    軽金属   63 ( 7 ) 253 - 259  2013年  [査読有り]

    DOI

  • Numerical and experimental study on residual stress in gray cast iron stress lattice shape casting

    Yuichi Motoyama, Hiroki Takahashi, Toshimitsu Okane, Yoya Fukuda, Makoto Yoshida

    Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science   44 ( 7 ) 3261 - 3270  2013年  [査読有り]

     概要を見る

    The prediction of residual stress in a stress lattice shape casting (stress lattice) has been conducted and discussed by some researchers via the Finite Element Method (FEM). However, most of the previous studies used the first-order tetrahedral element, which has poor analysis accuracy in problems including bending. The use of the first-order tetrahedral element makes the verification of these studies uncertain because the bending deformation essentially occurs in the stress lattice casting. This study first shows that the thermal stress analysis for the stress lattice should use the element that can represent the bending deformation in principle for bending of the thin parts. Second, the simulated residual stress was compared with the measured value. The thermal stress analysis successfully predicted the residual stress of the stress lattice casting with and 11 pct difference. In addition to the prediction of the residual stress, it is important from the viewpoint of the productivity of castings to reveal the effect of the shake-out temperature on the residual stress. However, in the previous studies, conclusions concerning the effect of the shake-out temperature on the residual stress were not consistent (i.e., the one study said the higher shake-out temperature decreased the residual stress, and another study said a higher shake-out temperature increased the residual stress). Therefore, the current study first discusses the reason for the inconsistent conclusions in the previous studies. Second, stress lattice castings were cast and shaken out at various shake-out temperatures. Then, the current study validated the effect of the shake-out temperature on the residual stress. Consequently, the experimental results supported the conclusion of Kasch and Mikelonis that the shake-out at higher temperature contributed to the increase of the residual stress in the casting. © The Minerals, Metals &amp
    Materials Society and ASM International 2013.

    DOI

  • 耐熱マグネシウム合金半凝固射出成形材の凝固割れ感受性評価

    藤井 敏男, 山本 元道, 篠崎 賢二, 三澤 亮太, 永井 淳嗣, 吉田 誠, 田中 達也

    軽金属   63 ( 6 ) 223 - 228  2013年  [査読有り]

    DOI

  • 半凝固状態における引張試験を用いたAl–Mg系合金の弾粘塑性構成式の構築

    高井 量資, 松下 彬, 柳田 章吾, 中村 浩一郎, 吉田 誠

    軽金属   63 ( 9 ) 310 - 317  2013年  [査読有り]

    DOI

  • Dynamic measurements of the load on castings and the contraction of castings during cooling in sand molds

    Yuichi Motoyama, Hiroki Takahashi, Yuki Inoue, Keita Shinji, Makoto Yoshida

    Journal of Materials Processing Technology   213 ( 2 ) 238 - 244  2013年  [査読有り]

     概要を見る

    The load on flange castings in sand molds was gradually increased beginning from the end of the solidification process until the final cooling stage. The maximum tensile load on the flange castings in furan sand molds was larger than that of the flange castings in green sand molds. With the furan sand mold, permanent deformation in the flange castings occurred beginning from the end of the solidification process until reaching a temperature of approximately 250°C. The mechanical interaction between the casting and the sand mold should be considered for more accurate stress calculations, particularly in furan sand molds. © 2012 Elsevier B.V.

    DOI

  • 各種金属材料の片振り/両振り疲労における繰返し応力-歪曲線を用いた疲労寿命の支配因子の検討

    小森 有祐美, 渡部 絵梨子, 戸田 桃子, 北澤 留弥, 吉田 誠, 堀部 進

    日本金屬學會誌   77 ( 8 ) 295 - 299  2013年  [査読有り]

     概要を見る

    Most studies on CSSC (cyclic stress-strain curve) have been conducted in the condition of the stress ratio R=−1. There are few reports on the effect of mean stress on CSSC. In this study, the stress-controlled fatigue tests under R=0 and −1 were performed on JIS S25C (AISI 1020), IF steel, A2024-T6, A6061-T6 and Ti-6Al-4V alloys. CSSCs of R=0 and −1 were compared. Creep strain (ratcheting strain) was also measured to investigate dominating mechanism of fatigue life of these alloys. It was found that the effect of mean stress on CSSC was different with each alloy. The dominating mechanism of JIS S25C and IF steel was creep strain. However, the dominating mechanism of A2024-T6 and A6061-T6 was plastic strain amplitude. The dominating mechanism of Ti-6Al-4V alloy was both creep strain and plastic strain amplitude. Thus, fatigue life reduction caused by mean stress in Ti-6Al-4V alloy was remarkably occurred than the other alloys.

    DOI CiNii

  • 各種金属材料の片振り/両振り疲労における繰返し応力-歪曲線を用いた疲労寿命の支配因子の検討

    小森 有祐美, 渡部 絵梨子, 戸田 桃子, 北澤 留弥, 吉田 誠, 堀部 進

    日本金属学会誌   77 ( 8 ) 295 - 299  2013年  [査読有り]

    DOI

  • 鋳物人

    吉田 誠

    鋳造工学 = Journal of Japan Foundry Engineering Society   84 ( 9 ) 554 - 555  2012年09月

    CiNii

  • 車体の軽量化と剛性向上を目指した新しいアルミニウム合金低圧鋳造プロセスの開発

    吉田 誠, 橘内 透, 八下田 健次, 神戸 洋史, 岡根 利光, 小岩井 修二, 山縣 裕

    自動車技術   66 ( 9 ) 56 - 60  2012年09月

    CiNii

  • 低圧鋳造法によるアルミニウム合金製大型・薄肉・中空車体鋳物の製造技術開発

    小岩井 修二, 橘内 透, 八下田 健次, 神戸 洋史, 岡根 利光, 山懸 裕, 吉田 誠

    鋳造工学 = Journal of Japan Foundry Engineering Society   84 ( 8 ) 477 - 481  2012年08月

    CiNii

  • Development of a device for dynamical measurement of the load on casting and the contraction of the casting in a sand mold during cooling

    Yuichi Motoyama, Hiroki Takahashi, Yuki Inoue, Keita Shinji, Makoto Yoshida

    JOURNAL OF MATERIALS PROCESSING TECHNOLOGY   212 ( 6 ) 1399 - 1405  2012年06月  [査読有り]

     概要を見る

    To predict and control the residual stress present in sand castings manufactured via CAE (Computer Aided Engineering), the mechanical interaction between the casting and the sand mold during cooling must be determined experimentally. A device was developed in this study to determine the load on the casting caused by the resistance of the mold and the contraction of the casting during cooling. Our device consists of two modules that work simultaneously: a module containing a load cell, for measuring the load on the casting during cooling and a module containing an LVDT (Linear Variable Differential Transformer) for measuring the contraction of the casting during cooling. In performance verification testing, the device enabled the simultaneous measurement of the load on the sand casting and the contraction of the casting. This measurement was performed dynamically during the cooling process. Additionally, for the case where the contraction of the casting was hindered by the sand mold, the permanent deformation of the casting after shake out (which leads to residual stress in the casting) was successfully measured using our device. (C) 2012 Elsevier B.V. All rights reserved.

    DOI

  • Development of a device for dynamical measurement of the load on casting and the contraction of the casting in a sand mold during cooling

    Yuichi Motoyama, Hiroki Takahashi, Yuki Inoue, Keita Shinji, Makoto Yoshida

    JOURNAL OF MATERIALS PROCESSING TECHNOLOGY   212 ( 6 ) 1399 - 1405  2012年06月  [査読有り]

     概要を見る

    To predict and control the residual stress present in sand castings manufactured via CAE (Computer Aided Engineering), the mechanical interaction between the casting and the sand mold during cooling must be determined experimentally. A device was developed in this study to determine the load on the casting caused by the resistance of the mold and the contraction of the casting during cooling. Our device consists of two modules that work simultaneously: a module containing a load cell, for measuring the load on the casting during cooling and a module containing an LVDT (Linear Variable Differential Transformer) for measuring the contraction of the casting during cooling. In performance verification testing, the device enabled the simultaneous measurement of the load on the sand casting and the contraction of the casting. This measurement was performed dynamically during the cooling process. Additionally, for the case where the contraction of the casting was hindered by the sand mold, the permanent deformation of the casting after shake out (which leads to residual stress in the casting) was successfully measured using our device. (C) 2012 Elsevier B.V. All rights reserved.

    DOI

  • Al-Mg合金およびAl-Si合金におけるAE法を用いた凝固割れ発生の判断基準

    松下 彬, 遠藤 至, 吉田 誠

    軽金属   62 ( 3 ) 104 - 108  2012年03月

     概要を見る

    Detection of solidification cracking of JIS AC7A aluminum alloy and Al–7%Si alloy was attempted by using acoustic emission method. In order to detect AE of solidification cracking, we investigated about AE signals of gas porosity, shrinkage cavity, and fracture in the semi-solid tensile test. The frequency bands of these casting defects were 150 kHz or less, so the source characterization of AE signals were difficult by that. Therefore we discussed and suggested value of integrated AE peak volt as an indicator of crack initiation. As a result, we proved value of time integral (IAP) is beneficial for eutectic alloy and value of temperature integral (TIAP) is beneficial for noneutectic alloy. We also suggested value of time temperature integral (DIAP) as the criterion of crack initiation which is beneficial for eutectic and non-eutectic alloy.

    CiNii

  • Ni基超合金Inconel 718の固相線温度近傍における力学特性取得に関する検討

    大橋 翼, 後藤 亮介, 武藤 健治, 吉田 誠

    日本金屬學會誌   76 ( 2 ) 148 - 154  2012年02月

     概要を見る

    Nickel-based superalloys have been applied to gas turbine and aircraft jet engine parts due to superior high temperature strength and corrosion resistance. However, casting defect such as solidification cracking often occurs. In order to increase productivity of precision casting and various shape casting processes, predicting the occurrence of solidification cracking by using CAE(Computer Aided Engineering) should be essential. Therefore, it is necessary to obtain mechanical properties in the state of solid-liquid coexistence. In this study, we try to get high temperature (around solidus temperature) mechanical properties of the nickel-based superalloy such as Inconel 718 by using originally developed tensile test. In the previous reports, flat distribution of temperature in the gage length, and crack initiation strain were not ensured. On the other, the developed device ensured within 3℃ of the temperature distribution in the gage length as to the Inconel 718. Tensile strain was measured by using in-situ observation of marker on the surface of the specimen. As a result, Stress-Strain curve, crack initiation stress, and crack initiation strain of Inconel 718 were obtained.

    CiNii

  • Mechanical Properties of Inconel 718 Nickel-Based Superalloy around Solidus Temperature

    Tsubasa Ohashi, Ryosuke Goto, Kenji Muto, Makoto Yoshida

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   76 ( 2 ) 148 - 154  2012年02月

     概要を見る

    Nickel-based superalloys have been applied to gas turbine and aircraft jet engine parts due to superior high temperature strength and corrosion resistance. However, casting defect such as solidification cracking often occurs. In order to increase productivity of precision casting and various shape casting processes, predicting the occurrence of solidification cracking by using CAE (Computer Aided Engineering) should be essential. Therefore, it is necessary to obtain mechanical properties in the state of solid-liquid coexistence. In this study, we try to get high temperature (around solidus temperature) mechanical properties of the nickel-based superalloy such as Inconel 718 by using originally developed tensile test. In the previous reports, flat distribution of temperature in the gage length, and crack initiation strain were not ensured. On the other, the developed device ensured within 3 degrees C of the temperature distribution in the gage length as to the Inconel 718. Tensile strain was measured by using in-situ observation of marker on the surface of the specimen. As a result, Stress-Strain curve, crack initiation stress, and crack initiation strain of Inconel 718 were obtained.

  • Ni基超合金Inconel 718の固相線温度近傍における力学特性取得に関する検討

    大橋 翼, 後藤 亮介, 武藤 健治, 吉田 誠

    日本金屬學會誌   76 ( 2 ) 148 - 154  2012年02月  [査読有り]

     概要を見る

    Nickel-based superalloys have been applied to gas turbine and aircraft jet engine parts due to superior high temperature strength and corrosion resistance. However, casting defect such as solidification cracking often occurs. In order to increase productivity of precision casting and various shape casting processes, predicting the occurrence of solidification cracking by using CAE(Computer Aided Engineering) should be essential. Therefore, it is necessary to obtain mechanical properties in the state of solid-liquid coexistence. In this study, we try to get high temperature (around solidus temperature) mechanical properties of the nickel-based superalloy such as Inconel 718 by using originally developed tensile test. In the previous reports, flat distribution of temperature in the gage length, and crack initiation strain were not ensured. On the other, the developed device ensured within 3℃ of the temperature distribution in the gage length as to the Inconel 718. Tensile strain was measured by using in-situ observation of marker on the surface of the specimen. As a result, Stress-Strain curve, crack initiation stress, and crack initiation strain of Inconel 718 were obtained.

    CiNii

  • Ni基超合金 Inconel 718 の固相線温度近傍における力学特性取得に関する検討

    大橋 翼, 後藤 亮介, 武藤 健治, 吉田 誠

    日本金屬學會誌   76 ( 2 ) 148 - 154  2012年02月  [査読有り]

    DOI

  • Al–Mg合金およびAl–Si合金におけるAE法を用いた凝固割れ発生の判断基準

    松下 彬, 遠藤 至, 吉田 誠

    軽金属   62 ( 3 ) 104 - 108  2012年  [査読有り]

    DOI

  • Al-Mg合金およびAl-Si合金におけるAE法を用いた凝固割れ発生の判断基準

    松下 彬, 遠藤 至, 吉田 誠

    軽金属   62 ( 3 ) 104 - 108  2012年

    DOI CiNii

  • Al-9%Si-0.3%Mgダイカスト合金のT5熱処理挙動における予備時効条件の影響

    井上 達也, 後藤 真英, 山口 篤司, 大竹 哲生, 黒田 明浩, 吉田 誠

    軽金属   61 ( 10 ) 507 - 512  2011年10月

     概要を見る

    Effect of pre-aging conditions on T5 heat treatment behavior of Al–9.0%Si–0.3%Mg die-casting alloy was investigated by using hardness measurement, differential scanning calorimetric analysis (DSC) and transmission electron microscopy (TEM). T5 treated alloy showed the positive effect on the two-step aging at pre-aging temperatures between 273 and 343 K, unlike T6 treated alloy which showed the negative effect at pre-aging temperatures below 343 K. The positive effect on two-step aging seems to be the characteristic behavior at T5 heat treatment. Difference of two-step aging behavior between T5 and T6 treatments seems to result from the difference of cluster (1) formed in the pre-aging process below 343 K. Higher water-quenching temperature after casting tended to increase the hardness after artificial aging.

    CiNii

  • ADC12合金ダイカストにおける介在物の発生過程

    高木 航, 吉田 誠

    鋳造工学 = Journal of Japan Foundry Engineering Society   83 ( 10 ) 579 - 585  2011年10月

    CiNii

  • Prediction Method of Crack Sensitivity during DC Casting of Al-Mn and Al-Mg Alloys

    Makoto Morishita, Mitsuhiro Abe, Kenji Tokuda, Makoto Yoshida

    MATERIALS TRANSACTIONS   52 ( 2 ) 166 - 172  2011年02月  [査読有り]

     概要を見る

    Because it has been difficult to predict crack sensitivity depending on alloy composition during aluminum direct chill casting (DC casting), a new prediction method based on the relationship between the calculated solid fraction and temperature was developed for Al-Mn and Al-Mg series aluminum alloys. In this work, two crack indexes are suggested. The first index is brittle temperature range (BTR). The second index is based on the strain rate difference in the mushy region. These indexes are quantitatively calculated by using thermodynamic software such as Thermo-calc. This method is verified by DC casting of A3000 and A5000 series aluminum alloys. It can be utilized in the alloy design stages to control the crack sensitivity before casting. [doi:10.2320/matertrans.L-M2010823]

    DOI

  • Prediction Method of Crack Sensitivity during DC Casting of Al-Mn and Al-Mg Alloys

    Makoto Morishita, Mitsuhiro Abe, Kenji Tokuda, Makoto Yoshida

    MATERIALS TRANSACTIONS   52 ( 2 ) 166 - 172  2011年02月  [査読有り]

     概要を見る

    Because it has been difficult to predict crack sensitivity depending on alloy composition during aluminum direct chill casting (DC casting), a new prediction method based on the relationship between the calculated solid fraction and temperature was developed for Al-Mn and Al-Mg series aluminum alloys. In this work, two crack indexes are suggested. The first index is brittle temperature range (BTR). The second index is based on the strain rate difference in the mushy region. These indexes are quantitatively calculated by using thermodynamic software such as Thermo-calc. This method is verified by DC casting of A3000 and A5000 series aluminum alloys. It can be utilized in the alloy design stages to control the crack sensitivity before casting. [doi:10.2320/matertrans.L-M2010823]

    DOI

  • アルミニウム合金の凝固過程におけるアコースティック・エミッション検知方法の発展

    植木 徹, 遠藤 至, 松下 彬, 吉田 誠

    軽金属   61 ( 7 ) 334 - 340  2011年

    CiNii

  • 高周波誘導加熱を用いたAl‐Mg系合金の半溶融状態の力学特性取得法の開発

    座間 淳志, 中澤 嵩, 利光 万弘, 吉田 誠

    軽金属   61 ( 5 ) 181 - 186  2011年

     概要を見る

    Solidification cracking is one of the defects of casting. In order to increase productivity of DC casting and various shape casting processes, predicting the occurrence of solidification cracking by using CAE (Computer Aided Engineering) should be essential. Therefore, it is necessary to obtain mechanical properties of solid-liquid coexistence alloys. However, in the previous reports, flat distribution of temperature in the gage length was not ensured. In this study, tensile test device for a semi-liquid Al–Mg alloy with 2°C of the temperature distribution in the gage length (Max. 10 mm) was developed. Tensile strain was measured by using in-situ observation of marker on the surface of the specimen. As the result, stress-strain curves and fracture strain in various temperatures on the semi-liquid Al–4.3mass%Mg alloy were measured. It is also found that tensile strain tends to be higher at neighborhood of the crack. Thus, strain depends on the gage length. From the observation of the fracture surface and estimation of Scheil-Gulliver micro-segregation, microstructure of the specimen were supposed to change due to the heating process.

    CiNii

  • グラウンドアンカーで耐震補強した鋼矢板式岸壁の耐震性に関する振動台実験および有効応力解析

    吉田 誠, 清宮 理, 三藤 正明, 田代 聡一, 合田 和哉

    構造工学論文集 A   57   63 - 74  2011年

     概要を見る

    Seismic behavior of sheet pile quay walls with ground anchor for seismic reinforcement is not clarified enough, because few case study of seismic behavior has been conducted. In this study, shaking table tests with a scale of 1 to 17 model in 1G field were conducted to investigate seismic behavior of sheet pile quay walls with ground anchor. And effective stress analyses were conducted to simulate seismic behavior of sheet pile quay walls with ground anchor in this tests. By arrangement of the ground anchors, displacement of the quay wall was fairly constrained and effectiveness of them was confirmed by the test and the analysis.

    CiNii

  • 半溶融および半凝固状態のAl‐Mg系合金の力学特性の比較

    座間 淳志, 利光 万弘, 渡部 智也, 千葉 浩行, 鳥山 隆成, 吉田 誠

    軽金属   61 ( 9 ) 446 - 451  2011年

     概要を見る

    In our previous works, tensile test devices for both semi-liquid and semi-solid aluminum alloys were developed. In this report, comparison of mechanical properties such as ultimate tensile strength (UTS) and fracture strain between semi-liquid and semi-solid Al–Mg alloy was examined. Difference of the mechanical properties will be caused by the microstructural change during heating process in the tensile test of semi-liquid alloy. By constant load creep test to the semi-liquid alloy, about 90% deformation of permanent and 10% of elastic deformation were found. Thus, in the thermal-stress analysis, solid–liquid co-existence aluminum alloy should be dealt as visco–elastic or viscoelasto–plastic material rather than elasto-plastic material.

    CiNii

  • その場観察によるアルミニウム合金の固液共存温度域における力学的特性の取得

    千葉 浩行, 植木 徹, 鳥山 隆成, 遠藤 至, 小林 昂光, 吉田 誠

    軽金属   61 ( 4 ) 135 - 141  2011年

     概要を見る

    It is necessary to obtain the mechanical properties of semi-solid alloy in order to predict the occurrence of solidification cracking, one of the serious casting defects of aluminum alloy die-casting and DC casting, by computer simulation. New in-situ measuring method for mechanical properties on semi-solid aluminum alloy by horizontal tensile test, based on that of Oya and Kitaoka et al., was developed. The strain was determined by measuring the displacement between dendrites defined as the makers. Influence of gage length on the fracture strain was clarified. Fracture strain and tensile strength of semi-solid Al–7mass%Si alloy were obtained.

    CiNii

  • Al–9%Si–0.3%Mgダイカスト合金のT5熱処理挙動における予備時効条件の影響

    井上 達也, 後藤 真英, 山口 篤司, 大竹 哲生, 黒田 明浩, 吉田 誠

    軽金属   61 ( 10 ) 507 - 512  2011年  [査読有り]

     概要を見る

    Effect of pre-aging conditions on T5 heat treatment behavior of Al–9.0%Si–0.3%Mg die-casting alloy was investigated by using hardness measurement, differential scanning calorimetric analysis (DSC) and transmission electron microscopy (TEM). T5 treated alloy showed the positive effect on the two-step aging at pre-aging temperatures between 273 and 343 K, unlike T6 treated alloy which showed the negative effect at pre-aging temperatures below 343 K. The positive effect on two-step aging seems to be the characteristic behavior at T5 heat treatment. Difference of two-step aging behavior between T5 and T6 treatments seems to result from the difference of cluster (1) formed in the pre-aging process below 343 K. Higher water-quenching temperature after casting tended to increase the hardness after artificial aging.

    DOI

  • アルミニウム合金の凝固過程におけるアコースティック・エミッション検知方法の発展

    植木 徹, 遠藤 至, 松下 彬, 吉田 誠

    軽金属   61 ( 7 ) 334 - 340  2011年  [査読有り]

    DOI

  • 高周波誘導加熱を用いたAl–Mg系合金の半溶融状態の力学特性取得法の開発

    座間 淳志, 中澤 嵩, 利光 万弘, 吉田 誠

    軽金属   61 ( 5 ) 181 - 186  2011年  [査読有り]

    DOI

  • その場観察によるアルミニウム合金の固液共存温度域における力学的特性の取得

    千葉 浩行, 植木 徹, 鳥山 隆成, 遠藤 至, 小林 昂光, 吉田 誠

    軽金属   61 ( 4 ) 135 - 141  2011年  [査読有り]

    DOI

  • 半溶融および半凝固状態のAl–Mg系合金の力学特性の比較

    座間 淳志, 利光 万弘, 渡部 智也, 千葉 浩行, 鳥山 隆成, 吉田 誠

    軽金属   61 ( 9 ) 446 - 451  2011年  [査読有り]

    DOI

  • 半溶融および半凝固状態のAl-Mg系合金の力学特性の比較

    座間 淳志, 利光 万弘, 渡部 智也, 千葉 浩行, 鳥山 隆成, 吉田 誠

    軽金属   61 ( 9 ) 446 - 451  2011年

    DOI CiNii

  • 1990年代以降におけるアルミニウム合金を中心とした凝固割れ研究の世界動向

    座間 淳志, 遠藤 至, 吉田 誠

    鋳造工学 = Journal of Japan Foundry Engineering Society   82 ( 11 ) 697 - 701  2010年11月

    CiNii

  • アルミニウム合金を中心とした凝固割れ発生のクライテリアの理論に関するレビュー(1980年代まで)

    座間 淳志, 吉田 誠

    鋳造工学 = Journal of Japan Foundry Engineering Society   82 ( 9 ) 583 - 589  2010年09月

    CiNii

  • Al–Fe–Si三元系合金のミクロ偏析とFe系化合物の晶出モデル

    森下 誠, 石田 斉, 吉田 誠

    軽金属   60 ( 4 ) 157 - 163  2010年04月  [査読有り]

    DOI

  • アルミニウム合金を中心とした凝固割れ発生のクライテリアの理論に関するレビュー (1990年代以降)

    座間 淳志, 吉田 誠

    鋳造工学   82 ( 10 ) 640 - 646  2010年

    CiNii

  • グラウンドアンカーの耐震補強効果に関するケーソン式岸壁の模型振動実験

    吉田 誠, 田代 聡一, 合田 和哉, 清宮 理

    土木学会論文集A1(構造・地震工学)   66 ( 1 ) 233 - 241  2010年

     概要を見る

    アンカーで耐震補強された岸壁の耐震性は数値解析などで確かめられてはいるが,実際の地震時挙動を確認した事例は少なく,アンカーによる耐震補強効果について十分には明らかにされていない.そこで,グラウンドアンカーによるケーソン式岸壁の耐震補強効果を明らかにすることを目的として,大型水中振動台による模型振動実験を実施した.その結果,ケーソン変位抑制時のアンカーおよび岸壁の動的挙動を明らかにするとともに,ケーソン式岸壁にアンカーを適用した場合の留意点を指摘した.さらに,本実験を対象として,ケーソンの滑動,転倒および支持力について安定計算を行った結果,耐震補強によるケーソン安定性向上への貢献度がケーソンの破壊モードに応じて異なることが明らかになった.

    CiNii

  • 超音波含浸pitch系炭素繊維強化Al‐Mg合金基複合材料の引張強さに及ぼす高温保持の影響

    溝口 郁美, 山口 翔, 谷内 滋昭, 吉田 誠

    軽金属   60 ( 8 ) 396 - 402  2010年

     概要を見る

    Carbon fiber reinforced aluminum alloy composites (CF/Al composites) are expected to be applied to electric power cable due to superior specific strength and specific modulus. It is reported that CF/Al composites form aluminum carbide (Al4C3) at the interface between carbon fiber and aluminum alloy. However, in operating condition (300°C, 36 years), the growth of Al4C3 and tensile strength of CF/Al composites have not been clarified. In this study, at first, pitch-based CF (XN-60)/Al composites are fabricated with ultrasonic infiltration method and held at 300, 450, 500°C for a given length of time. Secondary, influence of holding temperature on the quantity of Al4C3 was investigated. Thirdly, relationship between the quantity of Al4C3 and tensile strength of CF/Al composites was examined. As holding temperature increased, the quantity of Al4C3 increased and tensile strength decreased. Reaction kinetics calculation indicated that remaining strength versus theoretical strength (ROM) of the CF/Al composites, held at 300°C for 36 years, was 0.81. That is, it should be better for applying the pitch-based CF/Al composites to electric power cable than the PAN-based CF/Al composites.

    CiNii

  • Al‐Fe‐Si三元系合金のミクロ偏析とFe系化合物の晶出モデル

    森下 誠, 石田 斉, 吉田 誠

    軽金属   60 ( 4 ) 157 - 163  2010年

     概要を見る

    In order to develop high quality aluminum alloy products, modeling to predict a behavior of solute distribution in dendrite and precipitation within the inter-cell region quantitatively is important. However Scheil's and Brody-Flemings's equations can't find the precipitation behavior during solidification because a diffusion in liquid phase is not considered. Numerical analysis methods typified by "Phase Field" are more effective but a calculation time has not been enough short to apply industrial use, yet. Consequentially a mathematical model is developed based on the Matsumiya's calculus of finite differences for analyzing inter-cell microsegregation and precipition. Diffusion of solutes in both the solid and liquid is taken into consideration, and realistic mesh shape to calculate microsegregation is conducted for finite difference calculation at this Matsumiya's model. But the calculus hardly predict precipitation behavior, since liquid concentration shift by precipitation during solidification is not considered. Then we improved the model to estimate precipitation of intermetallic compounds by thermodynamics database in this work. Additionally evaluation method of microsegregation used by EPMA was developed. Consequently, we built a new segregation model, which could predict both the microsegregation and the kinds and amount of intermetallic compounds.

    CiNii

  • AE法と可視化手法を用いたAl‐7 mass%Si合金の凝固割れ検知

    遠藤 至, 千葉 浩行, 植木 徹, 鳥山 隆成, 吉田 誠

    軽金属   60 ( 10 ) 486 - 491  2010年

     概要を見る

    Detection of AE signals of solidification cracking of Al–7mass%Si alloy was attempted with in situ microscopic observation on the surface of casting using high speed camera. During solidification, it was found that AE signal from the casting with crack was higher than AE signal from the casting without crack. As a result of observation of casting using high speed camera, it was found that a rise of AE signal corresponded to initiation of solidification cracking. This stage was the stage of eutectic solidification. Thus, AE signals of solidification cracking should be generated during eutectic solidification. However, AE signals from the casting without cracking were also detected during solidification. This means that AE signals other than solidification cracking should be generated during solidification. Therefore, AE signals detected during eutectic solidification is not necessarily AE signals of solidification cracking. In order to detect AE signals of solidification cracking, it is necessary to separate AE signals of solidification cracking and other than solidification cracking.

    CiNii

  • AE法を用いたAl–7 mass%Si合金の凝固割れ検知のためのAE信号の分離

    遠藤 至, 千葉 浩行, 植木 徹, 鳥山 隆成, 吉田 誠

    軽金属   60 ( 10 ) 492 - 498  2010年  [査読有り]

    DOI

  • 超音波含浸pitch系炭素繊維強化Al–Mg合金基複合材料の引張強さに及ぼす高温保持の影響

    溝口 郁美, 山口 翔, 谷内 滋昭, 吉田 誠

    軽金属   60 ( 8 ) 396 - 402  2010年  [査読有り]

    DOI

  • アルミニウムDC鋳造中のスプラッシュ発生に及ぼす水冷条件の影響

    森下 誠, 阿部 光宏, 吉田 誠

    軽金属   60 ( 8 ) 379 - 385  2010年  [査読有り]

    DOI

  • AE法と可視化手法を用いたAl‐7 mass%Si合金の凝固割れ検知

    遠藤 至, 千葉 浩行, 植木 徹, 鳥山 隆成, 吉田 誠

    軽金属   60 ( 10 ) 486 - 491  2010年

     概要を見る

    Detection of AE signals of solidification cracking of Al–7mass%Si alloy was attempted with in situ microscopic observation on the surface of casting using high speed camera. During solidification, it was found that AE signal from the casting with crack was higher than AE signal from the casting without crack. As a result of observation of casting using high speed camera, it was found that a rise of AE signal corresponded to initiation of solidification cracking. This stage was the stage of eutectic solidification. Thus, AE signals of solidification cracking should be generated during eutectic solidification. However, AE signals from the casting without cracking were also detected during solidification. This means that AE signals other than solidification cracking should be generated during solidification. Therefore, AE signals detected during eutectic solidification is not necessarily AE signals of solidification cracking. In order to detect AE signals of solidification cracking, it is necessary to separate AE signals of solidification cracking and other than solidification cracking.

    DOI

  • 炭素系繊維強化アルミニウム複合材料の熱伝導特性に及ぼす諸因子の影響

    魚住 久雄, 中西 宏太, 井上 健太郎, 塚田 高行, 府山 伸行, 藤井 敏男, 吉田 誠

    軽金属   59 ( 10 ) 562 - 568  2009年10月  [査読有り]

    DOI

  • DC鋳造におけるAl–Mn系およびAl–Mg系アルミニウム合金の割れ感受性予測方法

    森下 誠, 阿部 光宏, 徳田 健二, 吉田 誠

    軽金属   59 ( 8 ) 417 - 423  2009年08月  [査読有り]

    DOI

  • レーザ表面溶融条件が SUS316 系ステンレス鋼の耐粒界腐食性に及ぼす影響

    武藤 健司, 古川 正英, 酒井 潤一, 吉田 誠

    日本金属学会誌   73 ( 5 ) 340 - 345  2009年05月  [査読有り]

    DOI

  • 超音波含浸PAN系炭素繊維強化Al–Mg合金基複合材料の引張強さに及ぼす高温保持の影響

    山口 翔, 三國 淳, 溝口 郁美, 松永 格, 篠崎 賢二, 吉田 誠

    軽金属   59 ( 5 ) 241 - 247  2009年05月  [査読有り]

    DOI

  • Effect of grain refiner and grain size on the susceptibility of Al-Mg die casting alloy to cracking during solidification

    Ryosuke Kimura, Haruaki Hatayama, Kenji Shinozaki, Izumi Murashima, Jo Asada, Makoto Yoshida

    JOURNAL OF MATERIALS PROCESSING TECHNOLOGY   209 ( 1 ) 210 - 219  2009年01月  [査読有り]

     概要を見る

    The die casting process and its alloys have been developed in recent years for automobile body parts such as B-pillars. However, it is known that die casting alloys with high ductility and fracture elongation often show a higher susceptibility to cracking during solidification than conventional AI-Si alloys. Thus, it is important to estimate and control the susceptibility to cracking during solidification before trial casting or mass-production. in this study, as a representative non-heat treatment type alloy, Al-4.Swt%Mg (JIS AC7A, AA 514) aluminum alloy was used. The effect of the addition of silicon and grain refiner on the reduction of the susceptibility to cracking was examined. in order to evaluate the susceptibility to cracking, both the "I-beam casting cracking test" and the "TIG spot welding cracking test" were carried out. As a result, the addition of Ti + B worked as a grain refiner on both testing methods. The susceptibility to cracking was significantly reduced by the addition of Ti + B in both the I-beam casting and the weld crater. It was found that the finer grain size led to lower susceptibility to cracking. Furthermore, the susceptibility to cracking of the die casting product decreased with the addition of Ti + B. (C) 2008 Elsevier B.V. All rights reserved.

    DOI

  • Fabrication process of carbon nanotube/light metal matrix composites by squeeze casting

    Hisao Uozumi, Kenta Kobayashi, Kota Nakanishi, Tadashi Matsunaga, Kenji Shinozaki, Hiroki Sakamoto, Takayuki Tsukada, Chitoshi Masuda, Makoto Yoshida

    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   495 ( 1-2 ) 282 - 287  2008年11月  [査読有り]

     概要を見る

    Multi-walled carbon nanotubes (MWCNTs) should be attractive for the reinforcement of metal-matrix composites, because of their high strength, high modulus and high thermal conductivity. However, the fiber diameter of MWCNTs is hundreds of times smaller than that of carbon fiber. This causes difficulty in infiltration into the MWCNT preform. Moreover, the threshold pressure which was applied to the preform will cause preform deformation. Therefore, knowledge of preform compressive properties which are the buckling strength and elastic modulus are necessary to fabricate the composites. In this study, at first, wettability of the basal plane of graphite by molten aluminum or magnesium was measured using the sessile drop method. Moreover, trial fabrication of MWCNT-reinforced aluminum or magnesium alloy composites was carried out by squeeze casting. As a result, these composites were fully infiltrated. An order-of-magnitude agreement was found between the estimated threshold pressure and the applied infiltration pressure to the MWCNT preform. (C) 2008 Elsevier B.V. All rights reserved.

    DOI

  • 凝固割れの発生理論と固液共存状態の合金の力学特性取得方法の発展(1980年代以降

    渡部 智也, 木村 亮介, 中澤 嵩, 千葉 浩行, 田中 宗平, 植木 徹, 鳥山 隆成, 吉田 誠

    軽金属   58 ( 9 ) 464 - 472  2008年09月  [査読有り]

    DOI

  • 凝固割れの発生理論と固液共存状態の合金の力学特性取得方法の発展(1950–70年代)

    渡部 智也, 木村 亮介, 中澤 嵩, 千葉 浩行, 田中 宗平, 植木 徹, 鳥山 隆成, 吉田 誠

    軽金属   58 ( 8 ) 395 - 405  2008年08月  [査読有り]

    DOI

  • 超音波含浸炭素繊維強化Al–Mg合金基複合材料の引張強さに及ぼす界面反応の影響

    三國 淳, 野々川 和幸, 松永 格, 篠崎 賢二, 吉田 誠

    軽金属   58 ( 1 ) 27 - 32  2008年01月  [査読有り]

    DOI

  • BN 界面相を有する焼結 SiC 繊維強化 SiO2-ムライト複合材料の作製と酸化挙動

    永久 堅也, 下條 泰広, 佐々木 元, 吉田 誠

    日本金属学会誌   71 ( 2 ) 275 - 283  2007年02月  [査読有り]

    DOI

  • Fabrication process of carbonaceous fiber reinforced Al and/or Mg alloy(s) composites by squeeze casting

    Uozumi, H, Kobayashi, K, Masuda, C, Yoshida, M

    Advanced Materials Research   15   209 - 214  2007年  [査読有り]

    DOI

  • Effect of acoustic cavitation on ease of infiltration of molten aluminum alloys into carbon fiber bundles using ultrasonic infiltration method

    Tadashi Matsunaga, Kenji Ogata, Tomei Hatayama, Kenji Shinozaki, Makoto Yoshida

    COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING   38 ( 3 ) 771 - 778  2007年  [査読有り]

     概要を見る

    Continuous M40J carbon fiber reinforced aluminum magnesium alloy composite wires have been fabricated using ultrasonic infiltration. The infiltration phenomenon is examined from the viewpoint of acoustic cavitation. The ease of infiltration of the molten alloys was found to be proportional to the maximum intensity of the acoustic cavitation. The ease of infiltration and the intensity were enhanced by the addition of surfactant elements into the molten aluminum. Thus, a decrease in surface tension caused an increase in the generation of acoustic cavitation thereby resulting in infiltration. Therefore, the generation of the acoustic cavitation is an infiltration controlling factor during the use of ultrasonic vibration. (c) 2006 Elsevier Ltd. All rights reserved.

    DOI

  • Fabrication of continuous carbon fiber-reinforced aluminum-magnesium alloy composite wires using ultrasonic infiltration method

    Tadashi Matsunaga, Kenji Matsuda, Tomei Hatayama, Kenji Shinozaki, Makoto Yoshida

    COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING   38 ( 8 ) 1902 - 1911  2007年  [査読有り]

     概要を見る

    In order to fabricate continuous carbon fiber-reinforced aluminum alloy matrix composites, various infiltration methods such as gas pressure infiltration, CVD-infiltration, and ultrasonic infiltration methods have been developed. Among these methods, the ultrasonic infiltration method is the simplest. In this study, the effects of ultrasonic power, the diameter of the hole of the horn, fabricating speed, and magnesium content on the ease of infiltration are investigated. As the results, both an ultrasonic power of 200 W and the addition of more than 2.4 mass% Mg are indispensable to infiltrate molten aluminum alloy into a PAN-based M40J carbon fiber bundle, which has 6000 filaments. Contrariwise, the tensile strength and relative strength (ROM ratio) of the obtained composites decreased from 1100 MPa (0.7) at both 2.4 and 4.7 mass% Mg contents to 800 MPa (0.5) at 10 mass% Mg content. This was probably caused by an increase in the content of the Al3Mg2 intermetallic compound. Consequently, the addition of magnesium is effective in improving the infiltration; however, it causes the strength of the composites to decrease. It is found that in this process, the optimum magnesium content in aluminum from the viewpoints of ease of infiltration and strength was 4.7 rnass%. (c) 2007 Elsevier Ltd. All rights reserved.

    DOI

  • 超音波含浸法を用いた炭素繊維バンドルへの溶融アルミニウム合金の含浸機構

    松永 格, 緒方 研二, 畑山 東明, 篠崎 賢二, 吉田 誠

    軽金属   56 ( 4 ) 226 - 232  2006年04月  [査読有り]

    DOI

  • 超音波振動印加時における溶融アルミニウム合金中の音響キャビテーションの発生挙動

    松永 格, 緒方 研二, 畑山 東明, 篠崎 賢二, 吉田 誠

    軽金属   56 ( 4 ) 214 - 220  2006年04月  [査読有り]

    DOI

  • 超音波含浸炭素繊維強化Al-Mg合金複合材料ワイヤの引張強さに及ぼすMg濃度の影響

    松永 格, 松田 謙治, 畑山 東明, 篠崎 賢二, 天沼 成一, 吉田 誠

    軽金属   56 ( 2 ) 105 - 111  2006年02月  [査読有り]

    DOI

  • 超音波含浸法を用いた炭素繊維強化アルミニウム合金系プリフォームワイヤの製造

    松永 格, 松田 謙治, 畑山 東明, 篠崎 賢二, 天沼 成一, 潘 進, 吉田 誠

    軽金属   56 ( 1 ) 28 - 33  2006年01月  [査読有り]

    DOI

▼全件表示

産業財産権

  • アルミニウム合金の粘性特性算出方法と粘性特性算出プログラム

    吉田 誠, 永田 益大

    特許権

  • パラメータの取得方法、及び砂型の三軸圧縮試験装置

    吉田 誠, 畑本 麻斗

    特許権

  • パラメータの取得方法、及び砂型の一面せん断試験装置

    吉田 誠, 加藤 宣幸, 白根 玄理

    特許権

  • 鋳造割れ感受性の小さいアルミニウム合金およびこれを用いたアルミニウム合金鋳物

    吉田 誠, 伊藤 淳矢, 永田 益大

    特許権

  • 複合体およびその製造方法

    吉田 誠

    特許権

  • 温度計測システム、加熱炉及び加熱炉内におけるワーク温度取得方法

    吉田 誠, 勝田 正文, 早乙女 康典

    特許権

  • 加熱炉及び加熱炉内におけるワーク温度取得方法

    吉田 誠, 勝田 正文, 早乙女 康典

    特許権

  • 加熱炉及び加熱炉内におけるワーク温度取得方法

    吉田 誠, 勝田 正文, 早乙女 康典

    特許権

  • ダイカスト金型、当該ダイカスト金型で製造されたダイカスト品およびダイカスト品の製造方法

    吉田 誠

    特許権

  • 鋳造欠陥を定量化するための測定装置、方法、コンピュータプログラムおよびコンピュータ読み取り可能な記録媒体

    5943402

    吉田 誠, 深澤 恵太, 柴田 悠矢

    特許権

  • 熱変形解析方法、熱変形解析プログラム、および熱変形解析装置

    6268584

    吉田 誠, 本山 雄一

    特許権

  • アルミニウム鋳造品の製造方法及びアルミニウム鋳造品

    吉田 誠

    特許権

  • 複合型の構造物を用いた鋳造法

    5818211

    吉田 誠

    特許権

  • 低温金型・低圧鋳造法

    5704641

    吉田 誠

    特許権

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受賞

  • 日本鋳造工学会優秀論文賞

    2018年05月   日本鋳造工学会   FEM熱応力解析による凝固割れ性予測に及ぼす鋳物の温度場と力学特性の影響  

    受賞者: 高井 量資, 角田 達也, 川田 康貴, 広原 嶺, 岡根 利光, 吉田 誠

  • 日本鋳造工学会優秀論文賞

    2016年05月   日本鋳造工学会   弾塑性クリープ構成式によるADC12合金鋳物の熱応力予測と有効性の実験的検証  

    受賞者: 志賀 英俊, 佐藤 武志, 神戸 洋史, 本山 雄一, 吉田 誠

  • 日本鋳造工学会論文賞

    2009年05月   日本鋳造工学会   Fe-Cr-Si繊維強化マグネシウム合金基複合材料の作製と機械的特性  

    受賞者: 魚住 久雄, 小林 健太, 白石 透, 勝矢 晃弘, 佐々木 元, 増田 千利, 府山 伸行, 藤井 敏男, 吉田 誠

  • 日本金属学会金属写真奨励賞

    2000年03月   日本金属学会   サクシノニトリル一水共晶・偏晶合金の成長形態のその場観察  

    受賞者: 光山 嘉一郎, 吉田 誠, 佐々木 元, 福山 秀春, 蒼井 一郎, 中江 秀雄

  • 日本金属学会論文賞

    1999年11月   日本金属学会   一方向凝固したAl-In偏晶合金の凝固組織に及ぼす重力の影響  

    受賞者: 吉田 誠, 村尾 伸介, 青井 一郎, 中江 秀雄

  • 日本金属学会論文賞

    1995年12月   日本金属学会   溶融Al-Si共晶合金とSiとの個液界面エネルギー測定  

    受賞者: 宋 基敬, 菊地 俊史, 吉田 誠, 中江 秀雄

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共同研究・競争的資金等の研究課題

  • 3Dプリンタを用いた三相界面の微細構造作製による固体電解質形燃料電池の性能向上

    研究期間:

    2016年04月
    -
    2017年03月
     

     概要を見る

    固体電解質形燃料電池において,ネットワークの断裂しない理想的な三相界面の立体的な微細構造を3Dプリンタによって形成すべく,電極,電解質および焼成後に空隙を形成させるための空隙補填剤の三種類のインクジェット用インクを,ノズルからの吐出性と高速な積層体形成の観点から,高濃度,高分散,粘性係数を評価関数として最適化されるように主剤となる溶質,溶媒,分散剤等の種類,濃度および配合比を調整した結果,25μm程度のピッチで完全なネットワークを確保した複数層の三相界面の形成に成功した

  • 2006- 産学連携(ヤマハ発動機) 固液共存領域の力学物性に関する研究

    研究期間:

    2006年
    -
     
     

  • 2004-2006 NEDO 炭素系繊維強化マグネシウム合金複合材料の作製、日産自動車、カーボンナノテクノロジーズ社

    研究期間:

    2004年
    -
    2006年
     

  • 2005- 産学連携(木村鋳造所)大型鋳鉄鋳物の熱応力・変形の予測と制御

    研究期間:

    2005年
    -
     
     

  • 2003-2005 広島県産業科学技術研究所、マツダ、リョービ等 耐熱マグネシウムの半凝固成形に関する研究開発

    研究期間:

    2003年
    -
    2005年
     

  • -2004 産学連携(リョービ)非熱処理型アルミダイカストの凝固割れに関する研究

    研究期間:

    2003年
    -
     
     

  • 2002-2003.3 NEDO産業技術研究助成事業(出資金による受託) 「高発電効率型・小型コジェネレーション発電・廃熱利用システム用/高耐熱・低慣 性複合材料の開発研究」広大、宇部興産、東洋炭素

    研究期間:

    2002年
    -
    2003年
     

  • 2002- 経済産業省地域コンソーシアム(出資金による受託) 半凝固射出成形法による循環型・軽量高品質自動車部品の研究開発 広大、産総研中国センター、岡山工技、マツダ、広島アルミ、朝日アルミ、リョービ

    研究期間:

    2002年
    -
     
     

  • 2000-2002.3

    研究期間:

    2001年
    -
    2002年
     

  • 1998-2001.3 NEDO 地域コンソーシアム「粉体離型潤滑剤を用いた素形材加工エコシステムの研究開発」 広大、広島西部工技センター、岡山工技センター、広島アルミ、光軽金属、福山技研、花野商事

    研究期間:

    1998年
    -
    2001年
     

  • 1997.4-2000.3 財団法人宇宙フォーラム地上公募実験(受託) 偏晶・共晶合金の凝固成長および偏析挙動に及ぼす重力の影響 広大、早稲田大学

    研究期間:

    1997年
    -
    2000年
     

  • 1996.4-1999.3中小企業事業団中小企業創造基盤技術研究事業 (出資金による受託)「チクソキャストによるハイブリット複合材料部材の開発」 広大、広島西部工技センター、広島アルミ、マイクロテクノ

    研究期間:

    1996年
    -
    1999年
     

  • 一方向凝固法によるAl_2O_3-Y_2O_3系共晶酸化物/炭化物系強化繊維の複合化

     概要を見る

    本研究では、酸化物共晶合金(Al203-YAG)とSiC(長繊維またはウィスカー)を溶融状態で複合化させ、超高温材料を製造することを最終目的としている。そのためには、溶融酸化物とSiCが共存する状態において互いに熱力学的に安定に存在することが必要である。これまでに、熱力学安定性を実験的、理論的に検討した。実験的には、酸化物共晶合金とSiCウィスカー粉末を混合、アーク溶解して複合化し、XRD,MDG(微小部エックス線回折),WDX,SEM,OPをもちいて反応式の検討を行った。この結果、アーク溶解によって液相の温度が上昇するとSiCは酸化物融液を還元し、一酸化炭素、または二酸化炭素を生成すると同時に金属Si相,Al相、また、Si,Yを含む炭化物相を生じることがわかった。反応の自由エネルギー計算を行った結果、2373Kにおいて、共晶酸化物融液とSiCの反応を防ぐためには、4.43atmの一酸化炭素分圧が必要であることが分かった。また、得られた複合材のビッカース硬度およびインデンテーションフラクチャー法によって常温靭性値番評価した。IF方による靭性値評価では、SiCウィスカーを体積率40%含む場合、 9MPam0.5となり、複合化により2倍近い向上が見られた。次に、モリブデン製の坩堝に、SiC長繊維と共晶合金を挿入し高周波加熱を行った。その結果、共晶融液は、SiC繊維の束に自発的に浸透し、凝固後、複合材両組織を形成した

  • 金属基複合材料の微視的変形、破壊挙動の解析

     概要を見る

    本研究では、スクイズキャスト法、半溶融および溶融攪拌法、ホットプレス法を用いて複合材料を作製した。強化材料として主に、SiC,Al_<18>B_4O_<33>,TiO_2の粒子、ウイスカ、繊維を用い、マトリックスとしてアルミニウム合金、マグネシウム合金およびチタン合金を用いた。これらの複合材料の機械的性質を明らかにし、その発現原因と走査型電子顕微鏡および透過電子顕微鏡による微細組織、変形・破壊組織の観察により明らかにした。また、ホットプレスで作製したニオブとMoSi_2の積層複合材料についても検討を行った。複合材料の機械的性質を決定する要因は、強化材の劣化、セラミックス/マトリックス界面の構造変化、マトリックスの組織の変化に依存する。特に、本研究では、界面に注目し、界面構造および変形、破壊組織を原子的レベルまで分析し、その界面反応が変形、破壊に与える影響を明らかにした。また、界面制御手法を考案することにより、機械的性質の優れた複合材料の設計指針を示した。更に、繊維系複合材料ではクリープ破断寿命を、繊維の耐荷能の時間変化を考慮した確率モデルにより、破断寿命を予測した。具体的成果として、TiO_2表面への熱化学的ドーピングによる複合材料の強化熱処理温度の低下、Al_<18>B_4O_<33>ウイスカ表面への均一なスピネル層の形成によるマトリックス合金との直接反応の阻止による高温安定性の向上を図ることができた。また、MoSi_2中に添加物を入れることによりNbとMoSi_2の界面反応を制御し、破壊靭性の優れた積層複合材料を製造することができた

  • 一方向凝固偏晶・共晶合金の協調成長および偏析挙動に及ぼす重力の影響

     概要を見る

    共晶合金の協調成長(カップルドグロース)に対する、晶出相間の比重差および対流の影響を、おのおの別個に評価、検討した。装置は、当該研究のために新たに開発した「有機物用縦型帯域溶融結晶成長装置」および「その場観察装置」を用いた。対流は、協調成長における溶質再分配の質量流束よりも1000倍以上大きい質量流束を有することが分かった。晶出相間に比重差がない場合は、対流は、晶出相の間隔を短くする傾向が確認された。晶出相間に比重差がある場合は、重力方向と反重力方向の一方向凝固組織に、差が生ずることが確認された。特に、irregular faceted/nonfaceted共晶系に分類され、なおかつ晶出相間に比重差がある場合は、凝固組織は成長方向の影響を受ける。その理由は、irregular faceted/nonfaceted共晶系ではセクロ界面が平滑ではないため、regular系におけるlateral diffusionのみなく、成長方向の溶質拡散、すなわちvertical diffusionが必要となる。結果として、液相の平均比中よりも比重の大きい溶質成分は、反重力方向への拡散が困難となり、逆に比重の小さい溶質成分は、重力方向への拡散が困難となるためと考えられる

  • 高効率コンバインド発電システム用SiC繊維強化酸化物マトリックス動翼材の開発研究

     概要を見る

    酸化物をマトリックスとする焼結SiC繊維強化複合材料の製造プロセス、および機棟的性質に関する検討を行った。製造プロセスとしては、溶融含浸法、スラリー含浸法、ともに可能であり、緻密なマトリックスを得ることが出来た。Al203-YAGマトリックスの場合は、1300℃での曲げ強度が780MPaであり常温の破壊エネルギーも14000J/m2に達した。しかし、界面強度調整のためのグラファイトの酸化問題と、強化繊維とマトリックスの線膨張係数の違いによるクラックの発生が問題となった。高温でプリフォーム中に酸化物を溶融含浸させるプロセスで作製したガラス+ムライトマトリックスの場合は、常温で曲げ強度1GPa,1300℃での曲げ強度が500MPa,常温破壊エネルギーは50000J/m2が得られている。線膨張係数の違いによるクラックはない。グラファイトを界面強度調整に用いた。酸化物に覆われているが、高温での酸化はまぬがれなかった。それゆえ、CVD-BNコーティングへの変更を実施した。窒素分圧を最適化することでコーティング膜の分解を抑制できた。残留応力状態は、マトリックス中のムライトの晶出量、すなわち、組成によって制御できることを、FEM解析およびプッシュアウト法で確認した。SiC強化繊維の線膨張係数は、シリカガラスとムライトの線膨張係数の間に存在する。それゆえ、ムライトの体積率を制御することで、複合材料中の残留応力を制御することができたものと考えられる。高温強度を向上させるためには、ムライトの体積率が大きい方が有利と予想されるため、50モル%アルミナ組成で複合材料を作製した。1650℃、30MPa,3.6ksecのホットプレス条件では、十分に緻密な組織が得られた。ホットプレス温度が1700℃になると、繊維が損傷を受けることが分かっている。従って、より高い圧力での複合材料作製を検討している

  • 晶出相間に比重差を有する多相凝固のカップルドグロースに及ぼす重力の影響

     概要を見る

    共晶合金の協調成長(カップルドグロース)に対する、晶出相間の比重差および対流・成長方向の影響を検討した。装置は、当該研究のために新たに開発した「有機物用縦型帯域溶融結晶成長装置」および「その場観察装置」を用いた。対流は、協調成長における溶質再分配の質量流束よりも1000倍以上大きい質量流束を有することが分かった。晶出相間に比重差がない場合は、対流は、晶出相の間隔を短くする傾向が確認された。晶出相間に比重差がある場合は、重力方向と反重力方向の一方向凝固組織に、差が生ずることが確認された。特に、irregular faceted/nonfaceted共晶系に分類され、なおかつ晶出相間に比重差がある場合は、凝固組織は成長方向の影響を受ける。その理由は、irregular faceted/nonfaceted共晶系ではマクロ界面が平滑ではないため、regular系におけるlateral diffusionのみなく、成長方向の溶質拡散、すなわちvertical diffusionが必要となる。結果として、液相の平均比中よりも比重の大きい溶質成分は、反重力方向への拡散が困難となり、逆に比重の小さい溶質成分は、重力方向への拡散が困難となるためと考えられる。無次元数等を計算した結果、ファセット相の間隙の融液が密度差によって浮上、沈降する可能性があることが示唆された。今後、より精密な計算、または、シミュレーシヨンによる確認が必要である。また、出来れば密度差による光の干渉、トレーサーなどを利用した実験的検証が必要と考えられる

  • カーボン系短繊維強化アルミ基複合材料の製造と界面組織解析

     概要を見る

    特性の優れたカーボンナノチューブ(CNT)などカーボン(CF)系短繊維強化アルミ基複合材料を放電焼結法で製造し、強度特性、熱伝導特性、界面組織を検討した。CNTとAl液滴との接触角は174°でほとんど、濡れることがなかった。CNT表面にAl, Mg金属をコーティングすることに成功した。またAL, Mg金属粉末にCNTを成長させることに成功した。これにより凝集したCNTを金属粉と均一に分散させる困難さを克服できる可能性を見出すことができたといえる

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講演・口頭発表等

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現在担当している科目

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