Transactions of Materials and Heat Treatment

Title：Constitutive equation and hot processing map of 12Cr-1Al-3Mn ferritic stainless steel

Authors： Li Yugui1 Zhao Zhihua2 Xu Wenchao2 Song Yaohui2 Zhang Mingxin3 Tian Chuanyu2 Zhang Zhihao1

Unit： 1.School of Mechanical Engineering Taiyuan University of Science and Technology 2.School of Materials Science and Engineering Taiyuan University of Science and Technology 3.Shanxi Aerospace Tsinghua Equipment Co. Ltd.

KeyWords： ferritic stainless steel hot deformation behavior constitutive equation hot processing map metallographic structure

ClassificationCode：TG142.71

year,vol(issue):pagenumber：2024,49(8):224-238

Abstract：

The hot compression experiments of 12Cr-1Al-3Mn ferritic stainless steel at the deformation temperature of 950-1100 ℃ and the strain rate of 0.01-10 s-1 were carried out with Gleeble-3800 thermal simulation device. According to the stress-strain curve, three constitutive equations describing the high temperature flow stress of the alloy were established based on the modified Johnson-Cook, modified Zerilli-Armstrong and strain-compensated Arrhenius constitutive models. Through quantitative analysis, it is verified that the strain-compensated Arrhenius model has a good predictive effect on the hot deformation behavior of 12Cr-1Al-3Mn ferritic stainless steel, and the correlation coefficient, mean relative error and root mean square error were 0.993, 3.57% and 4.818 MPa, respectively. In addition, the hot processing map of 12Cr-1Al-3Mn ferritic stainless steel was established, and it is found that the high strain rate could easily lead to the hot deformation instability of stainless steel, and combined with microstructure analysis, it is found that the increasing of temperature is conducive to recrystallization nucleation. Therefore, 12Cr-1Al-3Mn ferritic stainless steel has good machinability under the deformation process with the deformation temperature of 1020-1100 ℃ and the strain rate of 0.03-0.22 s-1.

Funds：

国家级大学生创新创业训练计划项目（202210109001）；山西省科技成果转化引导专项项目（202204021301057）；中央引导地方科技发展资金资助项目（YDZJSX2021A036）；国家自然科学基金资助项目（52375364）；山西省基础研究计划项目（TZLH20230818001）

作者简介：李玉贵（1967-），男，博士,教授 E-mail：liyugui@tyust.edu.cn

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