轧制态254SMo超级奥氏体不锈钢的热变形行为及本构方程  

Hot Deformation Behavior and Constitutive Equation Analysis of Rolled 254SMo Super Austenitic Stainless Steel

作　　者：李娜娜[1] 刘江林 张威[2] 王涛[1] 赵利平[1] Li Nana;Liu Jianglin;Zhang Wei;Wang Tao;Zhao Liping(Taiyuan University of Technology,Taiyuan 030024,China;Shanxi Taigang Stainless Steel Co.Ltd,Taiyuan 030003,China)

机构地区：[1]太原理工大学,山西太原030024 [2]山西太钢不锈钢股份有限公司,山西太原030003

出　　处：《稀有金属材料与工程》2020年第8期2712-2717,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金青年项目(51804215);山西省科技重大专项(20181102015);太原市科技重大专项(170203)。

摘　　要：为优化后续轧制工艺,利用Gleeble-3800热力模拟机,对轧制态254SMo超级奥氏体不锈钢进行等温恒应变速率压缩试验,研究了254SMo超级奥氏体不锈钢在变形温度为900~1100℃,应变速率为0.005~5 s^-1的热变形行为及微观组织演变。结果表明,随着变形温度升高及应变速率降低,峰值应力减小,且流变曲线的单峰特征变得明显,说明高温低应变速率下254SMo容易发生动态再结晶;3种形式的Arrhenius本构方程预测精度对比显示,指数形式的精度最高,相关系数达97.496%,变形激活能为546 kJ/mol。In order to optimize the subsequent rolling process,the Gleeble-3800 thermal simulator was used to test the isothermal constant strain rate compression of the as-rolled 254SMo super austenitic stainless steel.The thermal deformation behavior and microstructure evolution of 254SMo in the temperature range of 900~1100℃ under the strain rates of 0.005~5 s-1 were studied.The results show that the peak stress decreases with the deformation temperature increasing and the strain rate decreasing,and the single peak characteristic of flow curves become obvious,which indicates that 254SMo is prone to dynamic recrystallization under high temperature and low strain rate.The prediction accuracy comparison of the three forms of Arrhenius constitutive equations shows that the exponential form has the highest accuracy,the correlation coefficient is 97.496%,and the deformation activation energy is 546 kJ/mol.

关 键 词：254SMo超级奥氏体不锈钢 热压缩 本构方程 

分 类 号：TG306[金属学及工艺—金属压力加工]