Constitutive behavior and processing maps of low-expansion GH909 superalloy

Zhi-hao Yao; Shao-cong Wu; Jian-xin Dong; Qiu-ying Yu; Mai-cang Zhang; Guang-wei Han

doi:10.1007/s12613-017-1424-3

Volume 24 Issue 4

Apr. 2017

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 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

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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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Research Article

Constitutive behavior and processing maps of low-expansion GH909 superalloy

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Corresponding author:
Zhi-hao Yao E-mail: zhihaoyao@ustb.edu.cn
Received: 11 October 2016; Revised: 28 November 2016; Accepted: 29 November 2016

Abstract

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.
- iron-based materials;
- superalloys;
- hot deformation;
- constitutive equations;
- processing maps;
- microstructural evolution

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