金属热处理 ›› 2020, Vol. 45 ›› Issue (9): 237-239.DOI: 10.13251/j.issn.0254-6051.2020.09.044

• 测试与分析 • 上一篇    下一篇

42CrMo钢连续冷却转变曲线的测定与分析

李凯1, 胡建文1,2,3, 石少坤1   

  1. 1.河北科技大学 材料科学与工程学院,河北 石家庄 050018;
    2.河北省材料近净成形技术重点实验室,河北 石家庄 050018;
    3.航空轻质复合材料与加工技术河北省工程实验室,河北 石家庄 050018
  • 收稿日期:2020-03-12 出版日期:2020-09-25 发布日期:2020-12-29
  • 通讯作者: 胡建文,教授,博士,E-mail:hujianwen05@163.com
  • 作者简介:李凯(1995—),女,硕士研究生,主要研究方向为金属材料及热处理,E-mail:1305847629@qq.com

Measurement and analysis of continuous cooling transformation curves for 42CrMo steel

Li Kai1, Hu Jianwen1,2,3, Shi Shaokun1   

  1. 1. School of Materials Science and Engineering,Heibei University of Science and Technology,Shijiazhuang Hebei 050018,China;
    2. Hebei Key Laboratory of Material Near-Net Forming Technology,Shijiazhuang Hebei 050018,China;
    3. Hebei Engineering Laboratory of Aviation Lightweight Composite Materials and Processing Technology,Shijiazhuang Hebei 050018,China
  • Received:2020-03-12 Online:2020-09-25 Published:2020-12-29

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。

关键词: 42CrMo钢, CCT曲线, 冷却速度, 贝氏体, JMat-Pro软件

Abstract: 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 DIL805L 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.

Key words: 42CrMo steel, CCT curves, cooling rate, bainite, JMat-Pro software

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