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| Hot deformation behavior of a heat-resistant alloy without γ′-phase |
| Chen Dong<sup>1,2</sup>, Zheng‑dong Liu<sup>2</sup>, Zheng‑zong Chen<sup>2</sup>, Zhen Liu<sup>1,2</sup>, Jia‑zhuang Zheng<sup>1,2</sup>, Xi‑tao Wang<sup>1</sup> |
| 1 Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China; 2 Institute for Special Steels, Central Iron and Steel Research Institute, Beijing 100081, China |
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Abstract The hot compression behavior of the nickel-based heat-resistant alloy C-HRA-2 was investigateda Gleeble-1500 thermo-mechanical simulator with the deformation temperature range of 950–1150 °C and the strain rate of 0.001–10 s<sup>-1</sup>. The constitutive equation of the alloy was establishedusing a hyperbolic sine function, and the peak stress followed a power law relationship with the Zener–Hollomon parameter (Z). The activation energy was about 446 kJ mol<sup>-1</sup> for the whole hot deformation domain in this alloy. The optimum hot deformation condition was obtained in the temperature range of 1050–1150 °C and the strain rate range of 0.005–0.1 s<sup>-1</sup>. Unsafe domains during the hot deformation would occur in the strain rate range of 0.1–10 s<sup>-1</sup> with inhomogeneous microstructure and high-density twins in the alloy. The dominant nucleation mechanism of dynamic recrystallization (DRX) was continuous dynamic recrystallization with sub-grain rotation at high strain rate, while DRX at low strain rate was discontinuous dynamic recrystallization with original grain boundaries bulging.
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| Cite this article: |
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Chen Dong,Zheng‑dong Liu,Zheng‑zong Chen, et al. Hot deformation behavior of a heat-resistant alloy without γ′-phase[J]. Journal of Iron and Steel Research International, 2020, 27(7): 820-833.
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2020, Vol. 27 
