Super304H奥氏体耐热钢的热变形特性研究  

Study on characteristics of hot deformation in Super304H austenitic heat-resistant steel

作　　者：古美蓉 曹延峰 彭玲玲 余红星 欧平 王和斌 李乘波 刘小明 容昇 李玲[1] Gu Meirong;Cao Yanfeng;Peng Lingling;Yu Hongxing;Ou Ping;Wang Hebin;Li Chengbo;Liu Xiaoming;Rong Sheng;Li Ling(School of Materials and Environment,Guangxi Minzu University,Nanning 530105,Guangxi,China;College of Rare Earths,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China;School of Materials Science and Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China;Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization,Nanning 530105,Guangxi,China;Guangxi Colleges and Universities Key Laboratory of Environmental-friendly Materials and New Technology for Carbon Neutralization,Nanning 530105,Guangxi,China)

机构地区：[1]广西民族大学材料与环境学院,广西南宁530105 [2]江西理工大学稀土学院,江西赣州341000 [3]江西理工大学材料科学与工程学院,江西赣州341000 [4]广西先进结构材料与碳中和重点实验室,广西南宁530105 [5]广西高校环境友好材料及碳中和新技术重点实验室,广西南宁530105

出　　处：《钢铁钒钛》2024年第2期162-170,共9页Iron Steel Vanadium Titanium

基　　金：江西省自然科学基金(20202BABL204010);江西省重点研发计划(20223BBE51017)。

摘　　要：利用MMS-100型热力模拟试验机在温度为900~1200℃和应变速率为0.1~10 s^(-1)的条件下对Super304H奥氏体钢进行热压缩试验,根据获得的真应力-真应变试验数据,采用应变补偿法建立了该钢的Zener-Hollomon本构模型,基于动态材料理论绘制了该钢在0.02~0.7真应变下的热加工图。结果表明,在热变形过程,高的温度和低的应变速率有利于Super304H奥氏体钢发生动态再结晶;流变应力的本构模型预测值与试验值之间的相关系数及平均相对误差分别为0.989和7.007%,反映了建立的模型较为准确,可用于描述Super304H奥氏体钢热压缩的流变行为;Super304H奥氏体钢变形屈服且应变量达到一定程度后,继续变形将具有良好的热加工稳定性,由热加工图确定的Super304H奥氏体钢最佳热加工参数范围为1160~1200℃/0.1~0.55 s^(-1)。Hot compression test of Super304H austenitic steel was carried out by using a MMS-100thermal mechanical simulator at 900~1200℃and 0.1~10 s^(-1).Based on the true stress-true strain test data,the Zener-Hollomon constitutive model of the studied steel was established by using a strain compensation method,and the hot processing maps under a true strain range of 0.02~0.7 was drawn according to the dynamic material theory.The results show that high temperature and low strain rate are conducive to the occurrence of dynamic recrystallization in Super304H austenitic steel during the hot deformation process.The correlation coefficient and average relative error between the values of flow stress predicted by the constitutive model and experimental values are 0.989 and 7.007%,respectively,reflecting that the established model is relatively accurate and can be used to predict the flow behavior of Super304H austenitic steel under hot compression.Super304H austenitic steel will have a good hotworking stability after deformation reaching a certain degree.The optimal hot working parameter ranges of Super304H austenitic steel determined by the hot processing maps are 1160~1200℃/0.1~0.55 s^(-1).

关 键 词：Super304H奥氏体耐热钢 热变形 本构模型 热加工图 

分 类 号：TF76[冶金工程—钢铁冶金] TG115[金属学及工艺—物理冶金]