35CrMo钢控温模锻加热过程中奥氏体晶粒长大行为  

Austenite grain growth behavior of 35CrMo steel during heating process of isothermal forging

作　　者：黄元春[1,2,3] 黄雨田[2] 肖政兵[3] 王也君 许天成[2] 李文静[2] 

机构地区：[1]中南大学高性能复杂制造国家重点实验室,长沙410083 [2]中南大学轻合金研究院,长沙410083 [3]中南大学机电工程学院,长沙410083

出　　处：《粉末冶金材料科学与工程》2016年第4期645-651,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：国家重点基础研究发展规划(973计划)资助项目(2014CB046702)

摘　　要：将35CrMo钢试样在不同的加热温度和保温时间下进行等温奥氏体化处理,采用正较实验法研究加热温度与保温时间对奥氏体平均晶粒尺寸的影响,并对奥氏体晶粒长大行为进行研究。结果表明:当保温时间一定时,奥氏体晶粒尺寸随加热温度升高而增大,奥氏体晶粒的粗化温度为950℃;当加热温度一定时,奥氏体晶粒尺寸随保温时间延长而增大,保温初期晶粒快速长大,随保温时间延长,晶粒长大速率放缓。综合考虑加热温度、保温时间和初始奥氏体晶粒尺寸的影响,推导出35CrMo钢奥氏体晶粒长大模型,用该模型计算的晶粒尺寸与实验结果基本吻合。The 35CrMo steel was austenitized at different heating temperature and holding time by using of orthogonal experiment method. The effects of heating temperature and holding time on average austenite grain size and the dynamic behavior of austenite grain growth in the 35CrMo steel were studied. The results show that, the austenitic grain size increases with increasing the heating temperature, and the coarsening temperature of austenite grain is 950℃. The austenite grain size of 35CrMo steel increases with increasing holding time. The austenite grains grow up rapidly at the initial period, and the growth rate decreases with increasing holding time. The 35CrMo austenite grain growth model has been deducted by considering the influence of the heating temperature, holding time and the initial of austenite grain size. And the results of the model are in basic agreement with the experimental results.

关 键 词：正交试验 35CRMO钢 奥氏体化 晶粒长大模型 加热温度 保温时间 

分 类 号：TG161[金属学及工艺—热处理]