锻压技术

新型Fe-22Cr-25Ni奥氏体耐热钢的热变形和动态再结晶行为

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

单位：1.安徽冶金科技职业学院 2.安徽工业大学材料科学与工程学院 3 安徽工业大学冶金减排与资源综合利用教育部重点实验室

分类号：TG142

出版年,卷(期):页码：2024,49(6):227-238

摘要：

采用等温压缩实验研究了一种新型Fe-22Cr-25Ni奥氏体耐热钢在950~1150 ℃、0.01~10 s-1条件下的热变形和动态再结晶行为。结果表明：新型奥氏体耐热钢的动态再结晶程度随着变形温度的升高明显增大。在0.01~1 s-1应变速率范围内，动态再结晶程度随着应变速率的增大而减小；而在1~10 s-1应变速率范围内，动态再结晶程度随着应变速率的增大而增大。建立了新型奥氏体耐热钢的峰值应力本构模型和应变补偿本构模型，其热变形激活能Q为624.253 kJ·mol-1，高于传统的奥氏体耐热钢。利用应变补偿本构模型预测了新型奥氏体耐热钢的热变形流变应力，计算的相关系数r值为0.985，平均绝对相对误差AARE值为6.07%，表明该本构模型能够准确描述耐热钢的热变形行为。

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.

基金项目：

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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