淬火-配分处理对二次淬火时钢中残留奥氏体分解转变的影响  

Effect of quenching-partitioning process on decomposition of retained austenite in steel during secondary quenching

作　　者：历长云 张珊珊[2] 康人木 许磊 米国发 Li Changyun;Zhang Shanshan;Kang Renmu;Xu Lei;Mi Guofa(Faculty of Engineering,China University of Petroleum-Beijing at Karamay,Karamay Xinjiang 834000,China;School of Materials Science and Engineering,Henan Polytechnic University,Jiaozuo Henan 454000,China;Deyang Products Quality Supervision&Inspection Institute,Deyang Sichuan 618000,China)

机构地区：[1]中国石油大学(北京)克拉玛依校区工学院,新疆克拉玛依834000 [2]河南理工大学材料科学与工程学院,河南焦作454000 [3]德阳市产品质量监督检验所,四川德阳618000

出　　处：《金属热处理》2020年第10期11-16,共6页Heat Treatment of Metals

基　　金：中国石油大学(北京)克拉玛依校区科研启动项目(XQZX20200019,XQZX20200016)。

摘　　要：对0.26C-1.72Si-1.56Mn钢进行了不同碳配分时间的淬火-配分(Q-P)处理,并研究了其组织,特别是二次淬火中奥氏体的分解转变。结果表明:Q-P处理后都形成了板条马氏体+二次淬火组织,且二次淬火组织中都存在孪晶马氏体;碳配分时间在10~300 s范围内,Q-P处理后残留奥氏体中的C含量均高于1.0wt%,残留奥氏体的含量不低于11%(体积分数),有利于钢韧性的改善;初次淬火后未转变奥氏体的形态和尺寸是影响其稳定性的关键因素,初次马氏体板条界膜状奥氏体容易形成残留奥氏体;相对于块状未转变奥氏体,条状未转变奥氏体容易形成二次淬火马氏体及片状残留奥氏体。0.26C-1.72Si-1.56Mn steel was treated by quenching-partitioning(Q-P)with different carbon partitioning time,and the Q-P microstructure,especially the decomposition of austenite during the secondary quenching stage of the Q-P process,was investigated.The results show that the mix microstructure of lath martensite and secondary quenching microstructure is formed after Q-P treatment,with existence of twin martensite in the secondary quenching microstructure.After Q-P treatment,the C content in retained austenite is higher than 1.0 wt%and the content of retained austenite is not less than 11%(volume fraction)with the partitioning time in the range of 10-300 s,which is beneficial to the improvement of toughness.The morphologies and size of the untransformed austenite after primary quenching are the key factors affecting its stability.The film austenite between primary martensite laths is easy to become retained austenite.Compared with the block untransformed austenite,the strip-shaped untransformed austenite is easy to form secondary quenching martensite and lamellar retained austenite.

关 键 词：淬火-配分 二次淬火 残留奥氏体 二次马氏体 孪晶马氏体 

分 类 号：TG156.1[金属学及工艺—热处理]