1Cr12Ni3Mo2VN耐热钢的回火工艺  

Temper technics of heat-resistant steel 1Cr12Ni3Mo2VN

作　　者：谢学林[1] 杨钢[2] 陈庚[1] 傅骏[1] 雍歧龙[2] XIE Xue-lin YANG Gang CHEN Geng FU Jun YONG Qi-long(Department of Materials Engineering, Sichuan Engineering Technical College, Deyang 618000, Sichuan, China Institute for Special Steel, Central Iron and Steel Research Institute, Beijing 100081, China)

机构地区：[1]四川工程职业技术学院材料工程系,四川德阳618000 [2]钢铁研究总院特殊钢研究所,北京100081

出　　处：《钢铁研究学报》2017年第2期156-160,共5页Journal of Iron and Steel Research

摘　　要：利用金相显微镜、扫描电镜和透射电镜等研究了1Cr12Ni3Mo2VN耐热钢的回火工艺,结果指出试验钢产生第一类回火脆性的主要原因是马氏体板条界存在聚集长大的Fe_3C及M_3C脆性相,导致冲击韧性显著下降。Mo_2C与基体处于共格状态,使基体周围晶格产生很大的静畸变是次要原因;产生第二类回火脆性的原因,一是由于碳化物M_(23)C_6沿原奥氏体晶界和马氏体板条界迅速聚集并粗化,二是板条间残余奥氏体膜因碳贫化而发生热失稳分解。结合技术协议要求,为了有利于组织的稳定性,本试验钢的最佳回火工艺为580℃×2h空冷。The temper technics of heat-resistant steel 1Cr12Ni3Mo2 VN was investigated by metalloscopy,SEM and TEM.The results show that a large number of carbide Fe_3 C and M_3C growing along the martensite lath border is the main reason that caused No.1temper embrittlement,the static distortion caused by Mo_2C and matrix in a coherent state is secondary reason;a large number of carbide M_（23）C_6 growing together along austenitic grain boundary and the martensite lath border and the thermal decomposition of retained austenite are the main reasons for the No.2temper embrittlement.Combined with the technical agreement requirements,in order to benefit the stability of organization,the optimal temper technics is 580 ℃×2hby air cooling.

关 键 词：耐热钢 1Cr12Ni3Mo2VN 回火工艺 回火脆性 

分 类 号：TG161[金属学及工艺—热处理]