锻压技术

12Cr-1Al-3Mn铁素体不锈钢本构方程及热加工图

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

单位：1.太原科技大学机械工程学院 2.太原科技大学材料科学与工程学院 3.山西航天清华装备有限责任公司

分类号：TG142.71

出版年,卷(期):页码：2024,49(8):224-238

摘要：

采用 Gleeble-3800 热模拟装置对12Cr-1Al-3Mn铁素体不锈钢在变形温度为 950~1100 ℃、应变速率为0.01~10 s-1条件下进行了热压缩实验。根据应力-应变曲线，基于修正的 Johnson-Cook、修正的 Zerilli-Armstrong和应变补偿Arrhenius 3种本构模型，建立了3个描述该合金高温流动应力的本构方程。通过量化分析验证了应变补偿的 Arrhenius 模型对12Cr-1Al-3Mn铁素体不锈钢的热变形行为具有较好的预测性，相关系数、平均相对误差和均方根误差分别为 0.993、3.57%和4.818。此外，建立了12Cr-1Al-3Mn铁素体不锈钢的热加工图，发现高应变速率易导致不锈钢热变形失稳的发生，结合微观组织分析发现温度的升高有利于再结晶的形核。因此，12Cr-1Al-3Mn铁素体不锈钢在变形温度为1020~1100 ℃、应变速率为0.03~0.22 s-1的变形工艺下具有较好的加工性能。

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.

基金项目：

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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