奥氏体不锈钢的热压缩本构方程及动态再结晶行为  

Thermal Compression Constitutive Equation and Dynamic Recrystallization Behavior of Austenitic Stainless Steel

作　　者：孙文伟 张楚函 赵亚军 王均亚 赵秀明[1,3] 毛向阳 SUN Wenwei;ZHANG Chuhan;ZHAO Yajun;WANG Junya;ZHAO Xiuming;MAO Xiangyang(School of Materials Science and Engineering,Nanjing Institute of Technology,Nanjing 211167,China;Jiangsu Biaoxin Industrial Co.,Ltd.,Jingjiang 214536,China;Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology,Nanjing 211167,China)

机构地区：[1]南京工程学院材料科学与工程学院,南京211167 [2]江苏标新工业有限公司,靖江214536 [3]江苏省先进结构材料与应用技术重点实验室,南京211167

出　　处：《机械工程材料》2022年第6期49-56,63,共9页Materials For Mechanical Engineering

基　　金：江苏省高等学校自然科学研究重大项目(19KJA520003);南京工程学院大学生科技创新基金资助项目(TB20211610)。

摘　　要：利用Gleeble热力模拟试验机研究了304奥氏体不锈钢在变形温度950~1150℃、应变速率0.05~1 s^(-1)条件下的热压缩行为,根据真应力-真应变曲线,基于Arrhenius模型构建其在高温下的本构方程,并建立热加工图;基于试验数据建立动态再结晶模型,采用Deform软件对该钢的再结晶行为进行模拟,并进行试验验证。结果表明:随着应变速率的增大或变形温度的降低,不锈钢的流变应力增大;在变形温度1080~1120℃、应变速率0.05~0.2 s^(-1)和变形温度1120~1150℃、应变速率0.5~1 s^(-1)下,该钢具有良好的热加工性能;模拟得到在变形温度1000℃、应变速率0.05 s^(-1)和变形温度1100℃、应变速率0.05 s^(-1)下,试样心部再结晶晶粒体积分数和尺寸与试验结果间的相对误差小于7.62%,验证动态再结晶模型的准确性。The thermal compression behavior of 304 austenitic stainless steel under the conditions of deformation temperature of 950-1150℃and strain rate of 0.05-1 s^(-1)was studied by Gleeble thermal simulator.According to the true stress-strain curve,the constitutive equation at high temperature was constructed based on Arrhenius model,and the processing map was established.Based on the experimental data,a dynamic recrystallization model was established,and the recrystallization behavior of the steel was simulated by Deform software,and was verified by test.The results show that the flow stress of stainless steel increased with increasing strain rate or decreasing deformation temperature.When the deformation temperature was 1080-1120℃,the strain rate was 0.05-0.2 s^(-1),and the deformation temperature was 1120-1150℃,the strain rate was 0.5-1 s^(-1),the steel had good hot working properties.When the deformation temperature was 1000℃,the strain rate was 0.05 s^(-1),and the deformation temperature was 1100℃,the strain rate was 0.05 s^(-1),the relative error of the recrystallization grain volume fraction in the sample center and grain size between simulation and test results was smaller than 7.62%,which verified the accuracy of dynamic recrystallization model.

关 键 词：304不锈钢 热压缩 本构方程 动态再结晶 

分 类 号：TG142.71[一般工业技术—材料科学与工程]