淬火温度对5Cr15MoV钢空冷淬火组织与性能的影响  

Effect of quenching temperature on microstructure and properties of 5Cr15MoV steel by air-cooling quenching

作　　者：田春英 董纪 王军 张慧星 冯天建 刘晓凡 Tian Chunying;Dong Ji;Wang Jun;Zhang Huixing;Feng Tianjan;Liu Xiaofan(School of Mechanical Engineering,Tianjin Sino-German University of Applied Sciences,Tianjin 300350,China;School of Aeronautics and Astronautics,Tianjin Sino-German University of Applied Sciences,Tianjin 300350,China;Tianjin Xintai Technology Development Co.,Ltd.,Tianjin 300383,China)

机构地区：[1]天津中德应用技术大学机械工程学院,天津300350 [2]天津中德应用技术大学航空航天学院,天津300350 [3]天津市信泰科技发展有限公司,天津300383

出　　处：《金属热处理》2022年第8期211-216,共6页Heat Treatment of Metals

基　　金：天津市企业科技特派员项目(20YDTPJC01130)。

摘　　要：通过1000~1200℃间隔50℃的系列加热温度对5Cr15MoV马氏体不锈钢进行空冷淬火试验,并采用光学显微镜、EBSD和洛氏硬度计对不同温度淬火后组织和硬度进行检测,研究了淬火温度对试验钢组织、晶粒尺寸、残留奥氏体含量以及硬度的影响。结果表明,试验钢淬火后组织为马氏体+未溶合金碳化物+残留奥氏体。随着淬火温度升高,马氏体板条尺寸增大,未溶碳化物量逐渐减少直至消失,残留奥氏体含量先增加后减少。试验钢的硬度变化趋势为先增加后显著降低,在淬火温度为1050℃达到最大值60.8 HRC。试验钢硬度主要是马氏体的含碳量、晶粒尺寸、残留奥氏体含量和碳化物含量综合作用的结果。Air cooling quenching experiment was performed on 5 Cr15 MoV martensitic stainless steel at a series of heating temperatures ranging from 1000 ℃ to 1200 ℃ at an interval of 50 ℃. The test of microstructure and hardness were performed by means of optical microscope, EBSD and Rockwell hardness tester after quenching at different temperatures. The effect of quenching temperature on microstructure, grain size, retained austenite content and hardness of the tested steel was studied. The results show that the quenched steel consists of martensite, undissolved carbide and retained austenite. With the increase of quenching temperature, the size of martensitic lath increases, the amount of undissolved carbide decreases gradually until it disappears, and the content of retained austenite increases first and then decreases. The hardness of the tested steel increases first and then decreases significantly, and reaches the maximum of 60.8 HRC at 1050 ℃. The hardness of the tested steel is mainly the result of comprehensive effect of carbon content of martensite, grain size, retained austenite content and carbide content.

关 键 词：5Cr15MoV钢 空冷淬火 淬火温度 组织 硬度 

分 类 号：TG156[金属学及工艺—热处理]