加热温度对2.25Cr-1Mo-0.25V钢晶粒度的影响  

Effect of Heating Temperature on Grain Size of 2.25Cr-1Mo-0.25V Steel

作　　者：陈振宇[1] 胡传顺[1] 秦华[1] 朱健 

机构地区：[1]辽宁石油化工大学机械工程学院,辽宁抚顺113001 [2]抚顺市特种设备监督检验所,辽宁抚顺113006

出　　处：《热加工工艺》2013年第4期23-25,共3页Hot Working Technology

基　　金：辽宁省教育厅科学技术研究项目(LS2010098)

摘　　要：通过金相观察研究了加热温度对2.25Cr-1Mo-0.25V钢奥氏体晶粒长大规律的影响。结果表明,在1000℃以下晶粒长大不明显,加热温度超过1000℃晶粒快速长大,在1300℃晶粒完全粗化,这种钢的晶粒粗化温度为1000℃。第二相粒子在较低加热温度下不溶解,这些未溶解的第二相质点可起到对晶界迁移的钉扎作用。随着加热温度的升高,部分第二相粒子开始溶解,使其阻碍奥氏体晶粒长大的钉扎作用减弱。第二相质点的尺寸和体积分数的比值决定了奥氏体晶粒的粗化程度,一旦发生解钉现象,奥氏体晶粒快速长大。The effect of heating peak temperatures on the microstructure of 2.25Cr- 1Mo-0.25V steel was investigated by optical metallography. The results show that the size of the grains change little below 1000℃. When temperature exceeds 1000 ℃, the grains grow fast and completely coarse at 1300℃. The grain coarsening temperature of the steel is 1000℃. The second phase particles dissolves at a lower heating temperature.The undissolved second phase particles can play a pinning effect on the grain boundary migration. With the heating temperature increasing, part of the second phase particles begin to dissolve, and the pinning effect of hindering austenite grain growth becomes weaker. The grade of austenitic grain is determined by the ratio between particle size and volume fraction of the second phase particles. Once the the pinning force disappears, the austenite grain size grows fast.

关 键 词：2 25Cr-1Mo-0 25V钢 晶粒粗化温度 晶粒度 晶粒长大 

分 类 号：TG115.21[金属学及工艺—物理冶金]