Hot Deformation Behavior and Microstructue Evolution of Super Austenitic Stainless Steel 24Cr-22Ni-7Mo-0.4N

被引：0
|
作者：
Zhao Z. [1 ]
Liao L. [1 ]
Xu F. [2 ]
Zhang W. [2 ]
Li J. [1 ]
机构：
[1] Beijing Advanced Innovation Center for Materials Genome Engineering, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing
[2] State Key Laboratory of Advanced Stainless Steel Materials, Taiyuan Iron and Steel (Group) Co., Ltd., Taiyuan
来源：
Cailiao Yanjiu Xuebao/Chinese Journal of Materials Research | 2023年 / 37卷 / 09期
基金：
中国国家自然科学基金;
关键词：
dynamic recrystallization; hot deformation; metallic materials; microstructure; processing map; super austenitic stainless steel;
D O I：
10.11901/1005.3093.2022.311
中图分类号：
学科分类号：
摘要：
Hot deformation behavior and microstructure evolution of super austenitic stainless steel 24Cr-22Ni-7Mo-0.4N were studied by uniaxial compression tests at temperatures from 1123 K to 1473 K under strain rates of 0.001~10 s−1 up to the true strain of 0.8. The deformation parameters were modeled by Arrhenius equation and Zener-Hollomon parameter (Z). The peak stress and critical stress for dynamic recrystallization was found to exhibit a linear relationship with ln(Z/A), the thermal deformation activation energy of the steel was 497.11 kJ/mol. Based on the dynamic material model, the processing maps under different plastic strains were established. Electron backscatter diffraction (EBSD) was used to characterize the microstructure of the steel under different deformation conditions. The softening mechanism of the steel under most deformation conditions is discontinuous dynamic recrystallization (DDRX). Based on the analysis of microstructure and processing map, the optimum processing domain for hot deformation is identified as the deformation temperature of 1150~1200℃ and strain rate of 0.1~1 s-1,. © 2023 Chinese Journal of Materials Research. All rights reserved.
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页码：655 / 667
页数：12
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