摘要
研究了860~940℃淬火与200~600℃回火对42CrMo钢显微组织的影响,并用金相截线法对奥氏体晶粒尺寸进行测量,建立了42CrMo钢奥氏体晶粒生长动力学方程。结果表明,随着淬火温度和保温时间的增加,42CrMo钢中残留碳化物数量明显减少,碳化物由片状逐渐变为颗粒状。随着淬火温度的升高,板条马氏体组织变得越来越均匀细小。随着回火温度的升高,钢的显微组织向回火屈氏体、回火索氏体转变,当回火温度为600℃时,得到的回火索氏体组织更均匀密集。基于Beck模型的42CrMo钢奥氏体晶粒生长规律的拟合结果,得出奥氏体晶粒长大激活能为2.62×10^(3)J·mol^(-1)。
Effect of 860-940 ℃ quenching and 200-600 ℃ tempering processes on microstructure of 42CrMo steel was studied, the austenite grain size of the steel was measured by using metallographic linear intercept method, and the austenite grain growth kinetic equation of the steel was established. The results show that with the increase of quenching temperature and holding time, the number of residual carbides in the 42CrMo steel decreases obviously, and the carbides gradually change from flake to granular. With the increase of quenching temperature, the lath martensite becomes more and more uniform and fine.With the increase of tempering temperature, the microstructure of the steel changes to tempered troostite and tempered sorbite. When the tempering temperature is 600 ℃, the tempered sorbite is more uniform and dense. The fitting results of austenite grain growth of the 42CrMo steel based on Beck model shows that the activation energy of austenite grain growth is 2.62×10~3J·mol-1.
作者
李鸿娟
向成功
吴琼
王正才
Li Hongjuan;Xiang Chenggong;Wu Qiong;Wang Zhengcai(Ningbo Polytechnic,Ningbo Zhejiang 315800,China;Wafangdian Bearing Group Co.,Ltd.,Wafangdian Liaoning 116300,China;Hunan University of Humanities,Science and Technology,Loudi Hunan 417000,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2023年第1期181-185,共5页
Heat Treatment of Metals
基金
宁波职业技术学院国家级科研项目培育课题(NZ22GJ012)
湖南省双一流学科建设项目(湘教通[2018]469)
湖南省教育厅优秀青年项目(21B0787)。
