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| Hot deformation behavior and microstructure evolution of an Fe–30Cr–2Mo ultra-pure super ferritic stainless steel |
| Yang-yang Zhu1,2 Li-kui Ning1, Tong-zheng Xin3, En-ze Liu1, Jian Tong1, Zheng Tan1, Yang-tao Zhou1, Zhi Zheng1 |
| 1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning, China; 2 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, Liaoning, China; 3 School of Materials Science and Engineering, University of New South Wales, Sydney, NSW 2052, Australia |
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Abstract The hot deformation behavior and microstructure evolution of an Fe–30Cr–2Mo ultra-pure super ferritic stainless steel were investigated at the temperature range of 950–1150 ℃ and strain rate varying from 0.01 to 10 s-1. A strain compensated constitutive equation based on the Arrhenius-type model was established to predict the flow stress. The hot processing map based on the dynamic materials model was achieved to identify the optimum processing parameters. In addition, the features of microstructure evolution combined with the processing map were systematically investigated. The experimental results revealed that the flow stress increased with decreasing deformation temperature or increasing strain rate. Dynamic recovery was confirmed to be the predominant softening mechanism. The values of flow stress predicted by the strain compensated constitutive equation agreed well with the experimental values. The extent of dynamic recrystallization and recrystallized grain size increased with increasing deformation temperature or decreasing strain rate, and the continuous dynamic recrystallization was attributed to be the predominant mechanism of recrystallization during hot deformation. The optimum hot working parameters were determined to be the deformation temperature of 1070–1150 ℃ and strain rate of 0.1–1 s-1 with a peak power dissipation efficiency of 42%.
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| Cite this article: |
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Yang-yang Zhu,Li-kui Ning,Tong-zheng Xin, et al. Hot deformation behavior and microstructure evolution of an Fe–30Cr–2Mo ultra-pure super ferritic stainless steel[J]. Journal of Iron and Steel Research International, 2021, 28(10): 1291-1304.
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2021, Vol. 28 
