锻压技术

12%Cr超超临界转子钢热变形行为及高温塑性本构方程

英文标题：Hot deformation behavior and high temperature plastic constitutive equation for 12%Cr ultra-supercritical rotor steel

作者：张学忠刘建生何文武孔晓寒杨春鹏

单位：太原科技大学

关键词：12%Cr超超临界转子钢应变速率变形温度本构方程微观组织

分类号：TG115.21；TG142.7

出版年,卷(期):页码：2020,45(8):184-189

摘要：

以12%Cr超超临界转子钢作为研究对象，借助Gleeble-1500D热模拟实验机，在变形温度为900~1250 ℃，应变速率为0.005，0.05，0.5和5 s-1，变形量为50%的条件下，对试样进行热变形压缩实验。通过实验得到了该材料在不同参数下的应力-应变曲线，采用Arrhenius双曲正弦函数推导出12%Cr超超临界转子钢最大变形抗力本构方程，并分析了不同热加工条件下12%Cr超超临界转子钢的微观组织。通过实验可以得出：12%Cr超超临界转子钢对变形温度和应变速率的变化较为敏感，变形温度越高，应变速率越低，所对应的应力值越小，再结晶现象越容易发生。12%Cr超超临界转子钢的变形激活能为Q=5.266×105 J·mol-1。

For 12%Cr ultra-supercritical rotor steel, the hot deformation compression experiments were conducted by thermal simulator Gleeble-1500D under the conditions of the deformation temperatures of 900-1250 ℃, the strain rates of 0.005, 0.05, 0.5 and 5 s-1 and the deformation amount of 50%, and the stress-strain curves under different parameters were obtained. Then, the constitutive equation of the maximum deformation resistance of 12%Cr ultra-supercritical rotor steel was derived by hyperbolic sine function Arrhenius, and the microstructures of 12%Cr ultra-supercritical rotor steel under different hot working conditions were analyzed. The experimental results show that 12%Cr ultra-supercritical rotor steel is sensitive to the changes of deformation temperature and strain rate. The higher the deformation temperature is and the lower the strain rate is, the smaller the corresponding stress value is, and the more easily the recrystallization phenomenon occurs. Furthermore, the deformation activation energy Q of 12%Cr ultra-supercritical rotor steel is 5.266×105 J·mol-1.

基金项目：

国家自然科学基金资助项目 (51775361)；上海大件热制造工程技术研究中心（18DZ2253400）

张学忠(1979- )，男，博士研究生，E-mail：466945302@qq.com；通讯作者：刘建生(1958- )，男，博士，教授，博士生导师，E-mail：jiansliu@163.com

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