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Constitutive behavior and processing maps of low-expansion GH909 superalloy

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Abstract

The hot deformation behavior of GH909 superalloy was studied systematically using isothermal hot compression tests in a temperature range of 960 to 1040°C 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°C 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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Acknowledgements

The authors would like to acknowledge Professor Xi Chen (Columbia University) for his guidance and the financial supports of China Scholarship Council, Beijing Science Foundation (No. 2154051), Doctoral Fund of the Ministry of Education of China (No. 20130006120005), and the National Natural Science Foundation of China (No. 51401020).

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Authors and Affiliations

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

    Zhi-hao Yao, Shao-cong Wu, Jian-xin Dong & Mai-cang Zhang

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

    Zhi-hao Yao

  3. Beijing Institute of Aeronautical Materials, Beijing, 100095, China

    Qiu-ying Yu

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

    Guang-wei Han

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  1. Zhi-hao Yao
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Correspondence to Zhi-hao Yao.

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Yao, Zh., Wu, Sc., Dong, Jx. et al. Constitutive behavior and processing maps of low-expansion GH909 superalloy. Int J Miner Metall Mater 24, 432–443 (2017). https://doi.org/10.1007/s12613-017-1424-3

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