摘要
对经淬火+回火后的P92钢进行650℃不同时间时效处理。利用光学显微镜、扫描电子显微镜、透射电子显微镜对淬火和不同时间时效处理试样进行组织及析出相观察及分析;采用洛氏硬度计对其进行硬度测试。结果表明,P92钢淬火组织为板条马氏体+残留奥氏体+M_(23)C_6+MC。经不同时间时效处理后的基体组织均为回火托氏体,同时存在有M_3C、MC、M_(23)C_6等碳化物。时效150 h时Laves相开始析出沮随着时效时间延长,析出物尺寸增大,P92钢的硬度不断降低。时效初始硬度约为24 HRC,时效250 h后硬度约为20 HRC。
Quenched and tempered P92 steel was aged at 650℃ for different time.Microstructure and precipitates of P92 steel quenched and aged at 650℃ for different time were observed and analyzed by OM,SEM and TEM,hardness（HRC） test was investigated.The results show that the microstructure of quenched P92 steel is lath martensite ＋ retained austenite ＋ M23C6 ＋ MC.After aged for different time,the microstructure of P92 steel is tempered troostite,and M3C,MC and M23C6 carbides exist at the same time.Laves phase begin to precipitate during aging for 150 h.The size of precipitates in P92 steel increases and the hardness of P92 steel decreases with the prolonging of aging time.The aging initial hardness is about 24 HRC,the hardness of sample after 250 h aging is about 20 HRC.
出处
《金属热处理》
CAS
CSCD
北大核心
2015年第12期66-70,共5页
Heat Treatment of Metals
基金
内蒙古自治区高等院校科学研究项目(NJZY13137)
关键词
P92钢
时效处理
析出相
硬度
P92 steel
aging treatment
precipitate
hardness
