6Cr21Mn10MoVNbN钢热变形显微组织研究  

Hot deformation microstructure of steel 6Cr21Mn10MoVNbN

作　　者：余式昌[1] 吴申庆[2] 宫友军[3] 宫元生[3] 练明生[3] 

机构地区：[1]宝山钢铁股份有限公司技术中心,上海201900 [2]东南大学材料科学与工程系,江苏南京210096 [3]江苏申源特钢有限公司,江苏兴化225722

出　　处：《金属热处理》2008年第3期23-27,共5页Heat Treatment of Metals

基　　金：2006江苏省科技攻关项目(BE2006093)

摘　　要：采用Gleeble 2000热模拟试验机研究了不同变形条件对6Cr21Mn10MoVNbN气阀钢热变形后显微组织的影响。结果表明,6Cr21Mn10MoVNbN钢试样热变形时随变形温度升高动态再结晶晶粒尺寸增大,M7C3相数量先减少后增加;随着变形速率升高或变形后冷却速度加快,再结晶晶粒尺寸和M7C3相数量减小。动态再结晶未完成时,再结晶晶粒随变形量的增加而细化,而M7C3相难以析出;动态再结晶完成后,随变形量的加大,再结晶晶粒粗化和M7C3相数量逐步增多。M7C3相析出是在热变形结束后的冷却过程中进行的,主要在晶界上形核,析出机制为γ0→γ1+M7C3的胞状脱溶。The influence of different deformation conditions on hot deformation microstructure of 6Cr21Mn10MoVNbN valve steel was investigated by Gleeble 2000 thermomechanical simulation tester. The results show that, with increasing the deformation temperature, the grain size of dynamic recrystallization increases during hot deformation of 6Cr21 Mn10MoVNbN steel ,whereas the amounts of MTC3 phase firstly decrease and then increase. The grain size of dynamic recrystallization and the amounts of M7C3 phase decrease with the increase of deformation velocity or cooling velocity. The grain size of dynamic recrystallization decreases with increasing the deformation strain and M7C3 phase fails to precipitate before the completion of dynamic recrystallization. After completing dynamic recrystallization, the grain size of dynamic recrystallization and the amounts of M7C3 phase increase with increasing the deformation strain. The M7C3 phase nucleating mainly in grain boundary precipitates during cooling process after hot deformation of 6Cr21Mn10MoVNbN steel. The precipitated mechanism is cellular reaction,which is expressed as γ0→γ1＋ M7C3.

关 键 词：6Cr21Mn10MoVNbN钢 热变形 动态再结晶 M7C3相 胞状脱溶 

分 类 号：TG142.7[一般工业技术—材料科学与工程]