Mo对4Cr5Mo2V型热作模具钢热稳定性能的影响

doi:10.13251/j.issn.0254-6051.2022.12.029

金属热处理 ›› 2022, Vol. 47 ›› Issue (12): 168-174.DOI: 10.13251/j.issn.0254-6051.2022.12.029

Mo对4Cr5Mo2V型热作模具钢热稳定性能的影响

沈俞涛^1,2, 左鹏鹏^1,2,3, 吴晓春^1,2,3

1.省部共建高品质特殊钢冶金与制备国家重点实验室, 上海 200444;
2.上海大学材料科学与工程学院, 上海 200444;
3.上大鑫仑材料科技(广东)有限公司, 广东肇庆 526105

收稿日期:2022-07-23 修回日期:2022-10-23 出版日期:2022-12-25 发布日期:2023-01-05
通讯作者: 吴晓春,博士生导师,教授, E-mail:xcwu@staff.shu.edu.cn
作者简介:沈俞涛(1996—),男,硕士研究生,主要研究方向为模具钢材料研发与应用,E-mail:18058633818@163.com。
基金资助:
广东省重点领域研发计划(2020B010184002);上海市钢铁冶金新技术开发应用重点实验室自主课题(SKLASS2021-Z13);上海市科学技术委员会(19DZ2270200,20511107700)

Effect of Mo on thermal stability of 4Cr5Mo2V hot-work die steel

Shen Yutao^1,2, Zuo Pengpeng^1,2,3, Wu Xiaochun^1,2,3

1. State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200444, China;
2. School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China;
3. Shangda Xinlun Material and Technology Co., Ltd., Zhaoqing Guangdong 526105, China

Received:2022-07-23 Revised:2022-10-23 Online:2022-12-25 Published:2023-01-05

摘要/Abstract

摘要： 研究了Mo对4Cr5Mo2V型热作模具钢热稳定性能的影响,并利用扫描电镜(SEM)和透射电镜(TEM)等方法分析材料的微观组织。结果表明,含1.9%Mo和含2.4%Mo试验钢在600 ℃时的热稳定性能差异较小;在650 ℃时,相比于含2.4%Mo试验钢,含1.9%Mo试验钢经过48 h保温后硬度值低了2.3 HRC,马氏体基体的回复程度更大,出现较多的富Cr的大颗粒球状M₂₃C₆型碳化物,尺寸在150~200 nm之间,而2.4%Mo钢中弥散析出了数量更多的细小M₂C型二次碳化物,阻碍了富Cr型碳化物的长大,因此其碳化物的平均粒径更小,具有更好的热稳定性。

关键词: 热作模具钢, 热稳定性, 碳化物, Mo元素

Abstract: Effect of Mo on the thermal stability of 4Cr5Mo2V hot-work die steel was investigated, and the microstructure evolution was characterized by means of scanning electron microscope (SEM) and transmission electron microscope (TEM). The results show that the difference of thermal stability between the tested steels containing 1.9%Mo and 2.4%Mo at 600 ℃ is small. After holding at 650 ℃ for 48 h, the hardness of the 1.9%Mo steel is lower by 2.3 HRC than that of the 2.4%Mo steel, the recovery in the martensite matrix is more obvious, and there are more Cr-rich large-sized spherical M₂₃C₆ carbides with the size between 150-200 nm. While in the 2.4%Mo steel, more fine M₂C type secondary carbides are precipitated which hinder the Cr-rich carbides growth, the average particle size of carbides is smaller, so that the 2.4% Mo steel has better thermal stability.

Key words: hot-work die steel, thermal stability, carbides, Mo element

中图分类号:

TG142.45

沈俞涛, 左鹏鹏, 吴晓春. Mo对4Cr5Mo2V型热作模具钢热稳定性能的影响[J]. 金属热处理, 2022, 47(12): 168-174.

Shen Yutao, Zuo Pengpeng, Wu Xiaochun. Effect of Mo on thermal stability of 4Cr5Mo2V hot-work die steel[J]. Heat Treatment of Metals, 2022, 47(12): 168-174.

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Mo对4Cr5Mo2V型热作模具钢热稳定性能的影响

Effect of Mo on thermal stability of 4Cr5Mo2V hot-work die steel

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