摘要
利用JMat-Pro软件模拟了42CrMo钢的连续冷却转变曲线,并采用DIL805L相变淬火膨胀仪实测了钢的各相变点,对不同冷却速度下的组织转变和贝氏体含量进行了分析,并绘制其CCT曲线。结果表明:42CrMo钢Ac1=743℃,Ac3=792℃。冷速小于0.5℃/s时,组织为先共析铁素体与珠光体混合组织;冷速0.5~10℃/s之间,存在一定量的贝氏体,随冷速加快,贝氏体量先增后降,马氏体含量逐渐增多,使得硬度呈现较大增幅。冷速大于10℃/s,组织为基体马氏体+少量贝氏体的混合组织。
Microstructure transformation and bainite content at different cooling rates were analyzed to obtain the CCT curves of 42CrMo steel by using JMat-Pro software to simulate the continuous cooling transformation curve and by using DIL805 L thermal dilatometer to determine the phases transformation temperatures.The results show that Ac1 and Ac3 of the 42CrMo steel are 743℃ and 792℃,respectively.When the cooling rates are less than 0.5℃/s,the transformation products are proeutectoid ferrite and pearlite.In the cooling rate range of 0.5-10℃/s,a certain amount of bainite appears which increases first and then decreases with the cooling rate increasing,meanwhile the martensite content increases gradualy and resulting to a large increase of hardness.When the cooling rate is over 10℃/s,the resulted microstructure is the mixed collective composed of martensite matrix and a small amount of bainite.
作者
李凯
胡建文
石少坤
Li Kai;Hu Jianwen;Shi Shaokun(School of Materials Science and Engineering,Heibei University of Science and Technology,Shijiazhuang Hebei 050018,China;Hebei Key Laboratory of Material Near-Net Forming Technology,Shijiazhuang Hebei 050018,China;Hebei Engineering Laboratory of Aviation Lightweight Composite Materials and Processing Technology,Shijiazhuang Hebei 050018,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2020年第9期237-240,共4页
Heat Treatment of Metals
