新型奥氏体耐热不锈钢C-HRA-5的热变形行为  

Hot deformation behavior of C-HRA-5 new austenitic heat resistant stainless steel

作　　者：王伟聪 杜华云[1] 侯利锋[1] 卫欢[1] 刘笑达 卫英慧[1] WANG Weicong;DU Huayun;HOU Lifeng;WEI Huan;LIU Xiaoda;WEI Yinghui(School of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China)

机构地区：[1]太原理工大学材料科学与工程学院,山西太原030024

出　　处：《钢铁研究学报》2022年第5期496-503,共8页Journal of Iron and Steel Research

基　　金：山西省重大专项资助项目(20181101014,20191102006)。

摘　　要：为了获得C-HRA-5钢轧制生产的最佳工艺参数,采用Gleeble-3800热力模拟试验机对C-HRA-5钢进行了双道次热压缩实验。实验在变形温度范围为900~1 100℃,应变速率范围为0.01~1 s^(-1),道次间隙时间分别为1、5、15、30 s的条件下获得C-HRA-5钢的真应力-应变曲线。采用0.2%补偿法计算得到了软化分数,且软化分数随变形温度的升高和应变速率的增大而增加。通过线性回归分析得到了MDRX的动力学方程。建立的C-HRA-5钢热加工图表明材料在1 000~1 100℃的范围内变形稳定。此外,道次间隙时间为5 s时,C-HRA-5钢在较低温度下进行第2道次压缩的过程中不会出现失稳。To obtain the optimum process parameters for rolling production of C-HRA-5 steel, a series of double-hit hot compression experiments were conducted on the C-HRA-5 steel by a Gleeble-3800 thermal simulation tester. The true stress-strain curves of C-HRA-5 steel were obtained under the conditions that the deformation temperature range is 900-1 100 ℃, the strain rate range is 0.01-1 s^(-1), and the interval time is 1, 5, 15, and 30 s, respectively. The 0.2% offset method was used to calculate softening fraction, and the softening fraction increases with the increase of deformation temperature and strain rate. The kinetic equations of MDRX were obtained by linear regression analysis. The established hot processing maps of C-HRA-5 steel show that the deformation of the material in the range of 1 000-1 100 ℃ is stable. In addition, the C-HRA-5 steel will be no instability during the second channel compression at a lower temperature when the interval time is 5 s.

关 键 词：C-HRA-5钢 亚动态再结晶 动力学方程 热加工图 热变形 

分 类 号：TG335.11[金属学及工艺—金属压力加工]