新型Fe-22Cr-25Ni奥氏体耐热钢的热变形和动态再结晶行为  

Thermal deformation and dynamic recrystallization behavior of newFe-22Cr-25Ni austenitic heat-resistant steel

作　　者：魏海莲 邓笑举 蔡勇 彭浩东 王健[2] 端强[1] 潘红波[3] Wei Hailian;Deng Xiaoju;Cai Yong;Peng Haodong;Wang Jian;Duan Qiang;Pan Hongbo(Department of Metallurgical Engineering,Anhui College of Metallurgy and Technology,Maanshan 243000,China;School of Materials Science and Engineering,Anhui University of Technology,Maanshan 243002,China;Key Laboratory of Metallurgical Emission Reduction and Resources Recycling of Ministry of Education,Anhui University of Technology,Maanshan 243002,China)

机构地区：[1]安徽冶金科技职业学院冶金工程系,安徽马鞍山243000 [2]安徽工业大学材料科学与工程学院,安徽马鞍山243002 [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,安徽马鞍山243002

出　　处：《锻压技术》2024年第6期227-238,共12页Forging & Stamping Technology

基　　金：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)。

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℃、0.01~10s^(-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0.01~1s^(-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1~10s^(-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624.253kJ·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 stud-ied by isothermal compression experiment at the temperature of 950-1150 C 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 tempera-ture.In the strain rate range of 0.O1-1 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%,indica-ting that the constitutive model can accurately describe the thermal deformation behavior of the heat-resistant steel.

关 键 词：奥氏体耐热钢 热变形 动态再结晶 流变应力 本构模型 

分 类 号：TG142[一般工业技术—材料科学与工程]