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Volume 24 Issue 4
Apr.  2017
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文章导航 >  矿物冶金与材料学报（英文）  > 2017  >  24(4): 432-443
Zhi-hao Yao, Shao-cong Wu, Jian-xin Dong, Qiu-ying Yu, Mai-cang Zhang,  and Guang-wei Han, Constitutive behavior and processing maps of low-expansion GH909 superalloy, Int. J. Miner. Metall. Mater., 24(2017), No. 4, pp. 432-443. https://doi.org/10.1007/s12613-017-1424-3
Cite this article as:
Zhi-hao Yao, Shao-cong Wu, Jian-xin Dong, Qiu-ying Yu, Mai-cang Zhang,  and Guang-wei Han, Constitutive behavior and processing maps of low-expansion GH909 superalloy, Int. J. Miner. Metall. Mater., 24(2017), No. 4, pp. 432-443. https://doi.org/10.1007/s12613-017-1424-3
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研究论文

Constitutive behavior and processing maps of low-expansion GH909 superalloy

  • School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

  • The Fu Foundation School of Engineering and Applied Science, Columbia University, New York 10027, USA

  • Beijing Institute of Aeronautical Materials, Beijing 100095, China

  • Department of High Temperature Materials Research, Central Iron and Steel Research Institute, Beijing 100081, China

  • 通讯作者:

    Zhi-hao Yao    E-mail: zhihaoyao@ustb.edu.cn

  • The hot deformation behavior of GH909 superalloy was studied systematically using isothermal hot compression tests in a temperature range of 960 to 1040℃ and at strain rates from 0.02 to 10 s-1 with a height reduction as large as 70%. The relations considering flow stress, temperature, and strain rate were evaluated via power-law, hyperbolic sine, and exponential constitutive equations under different strain conditions. An exponential equation was found to be the most appropriate for process modeling. The processing maps for the superalloy were constructed for strains of 0.2, 0.4, 0.6, and 0.8 on the basis of the dynamic material model, and a total processing map that includes all the investigated strains was proposed. Metallurgical instabilities in the instability domain mainly located at higher strain rates manifested as adiabatic shear bands and cracking. The stability domain occurred at 960-1040℃ and at strain rates less than 0.2 s-1; these conditions are recommended for optimum hot working of GH909 superalloy.
    • Research Article

    Constitutive behavior and processing maps of low-expansion GH909 superalloy

    + Author Affiliations
      Abstract
    • The hot deformation behavior of GH909 superalloy was studied systematically using isothermal hot compression tests in a temperature range of 960 to 1040℃ and at strain rates from 0.02 to 10 s-1 with a height reduction as large as 70%. The relations considering flow stress, temperature, and strain rate were evaluated via power-law, hyperbolic sine, and exponential constitutive equations under different strain conditions. An exponential equation was found to be the most appropriate for process modeling. The processing maps for the superalloy were constructed for strains of 0.2, 0.4, 0.6, and 0.8 on the basis of the dynamic material model, and a total processing map that includes all the investigated strains was proposed. Metallurgical instabilities in the instability domain mainly located at higher strain rates manifested as adiabatic shear bands and cracking. The stability domain occurred at 960-1040℃ and at strain rates less than 0.2 s-1; these conditions are recommended for optimum hot working of GH909 superalloy.
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