Transactions of Materials and Heat Treatment

Title：Thermal deformation and dynamic recrystallization behavior of new Fe-22Cr-25Ni austenitic heat-resistant steel

Authors： Wei Hailian1 2 Deng Xiaoju2 Cai Yong2 Peng Haodong2 Wang Jian2 Duan Qiang1 Pan Hongbo3

Unit： 1.Anhui College of Metallurgy and Technology 2.School of Materials Science and Engineering Anhui University of Technology 3.Key Laboratory of Metallurgical Emission Reduction and Resources Recycling of Ministry of Education Anhui University of Technology

KeyWords： austenitic heat-resistant steel thermal deformation dynamic recrystallization rheology stress constitutive model

ClassificationCode：TG142

year,vol(issue):pagenumber：2024,49(6):227-238

Abstract：

The thermal deformation and dynamic recrystallization behavior of a new Fe-22Cr-25Ni austenitic heat-resistant steel were studied by isothermal compression experiment at the temperature of 950-1150 ℃ and the strain rate of 0.01-10 s-1. The results show that the dynamic recrystallization degree of the new austenitic heat-resistant steel increases obviously with the increasing of deformation temperature. In the strain rate range of 0.01-1 s-1, the dynamic recrystallization degree decreases with the increasing of strain rate, while in the strain rate range of 1-10 s-1, the dynamic recrystallization degree increases with the increasing of strain rate. The peak stress constitutive model and the strain compensation constitutive model of the new austenitic heat-resistant steel are established, and the thermal deformation activation energy Q of the new austenitic heat-resistant steel is 624.253 kJ·mol-1, which is higher than that of traditional austenitic heat-resistant steel. The thermal deformation rheology stress of the new austenitic heat-resistant steel is predicted by the strain compensation constitutive model, the value of correlation coefficient r is 0.985, and the value of average absolute relative error AARE is 6.07%, indicating that the constitutive model can accurately describe the thermal deformation behavior of the heat-resistant steel.

Funds：

国家自然科学基金资助项目（51774006,U1860105）；安徽省重点研发计划资助项目（202304a05020026）；安徽省自然科学基金资助项目（2008085QE279）；安徽工业大学省级大学生科研训练计划资助项目（S202310360186）

作者简介：魏海莲（1988-），女，博士，讲师，E-mail：whl0403@126.com；通信作者：潘红波（1978-），男，博士，教授，E-mail：20130007@ahut.edu.cn

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