304 不锈钢热变形行为及本构模型研究  

Study on thermal deformation behavior and constitutive model of 304 stainless steel

作　　者：姚硕 陈志英 张莹[2] 曹峰华[3] 孙彦 YAO Shuo;CHEN Zhiying;ZHANG Ying;CAO Fenghua;SUN Yan(School of Mechanical and Automotive Engineering,Shanghai University of Engineering Science,Shanghai 201620,China;School of Materials Science and Engineering,Shanghai University of Engineering Science,Shanghai 201620,China;School of Mechanical Engineering,Shanghai Dianji University,Shanghai 200245,China)

机构地区：[1]上海工程技术大学机械与汽车工程学院,上海201620 [2]上海工程技术大学材料科学与工程学院,上海201620 [3]上海电机学院机械学院,上海200245

出　　处：《上海工程技术大学学报》2022年第4期435-439,共5页Journal of Shanghai University of Engineering Science

摘　　要：利用Gleeble-3800热/力学模拟试验机研究304不锈钢热变形行为,通过变形温度区间为800~1200℃,应变速率区间为0.001~1 s^(-1)的热压缩试验,得到304不锈钢在此区间的真实应力-应变曲线.结果表明,304不锈钢在热变形过程中,流动应力随着温度的降低和应变速率的升高而增大.根据真实应力-应变曲线构建304不锈钢的Arrhenius本构方程,其热变形激活能为490 kJ/mol,ln Z和lnσ_(p)之间的线性相关系数为0.93,说明模型应力预测值与试验值吻合较好.Thermal deformation behavior of 304 stainless steel was investigated by utilizing Gleeble−3800 thermo-mechanical simulator.The true stress-strain curves of 304 stainless steel were obtained through the hot compression experiment with temperature range of 800~1200℃and the strain rate range of 0.001~1 s^(−1).The results show that the flow stress of 304 stainless steel increases with the reduction of temperature and the growth of strain rate during the hot deformation.According to the true stress-strain curves,the Arrhenius constitutive equation of 304 stainless steel was constructed.The hot deformation activation energy is 490 kJ/mol and the linear correlation coefficient between lnZ and ln is 0.93,which shows that the stress values predicted by the model are in good agreement with the experimental ones.

关 键 词：304不锈钢 热变形 流动应力 本构模型 

分 类 号：TG316[金属学及工艺—金属压力加工]