淬火温度对低钴二次硬化钢组织和性能的影响

doi:10.13251/j.issn.0254-6051.2022.03.018

金属热处理 ›› 2022, Vol. 47 ›› Issue (3): 92-96.DOI: 10.13251/j.issn.0254-6051.2022.03.018

淬火温度对低钴二次硬化钢组织和性能的影响

熊金生^1,2, 宁静², 苏杰², 姜庆伟¹

1.昆明理工大学材料科学与工程学院, 云南昆明 650093;
2.钢铁研究总院特殊钢研究院, 北京 100081

收稿日期:2021-11-10 修回日期:2022-01-11 出版日期:2022-03-25 发布日期:2022-04-22
通讯作者: 苏杰,正高级工程师,E-mail: sujie@nercast.com
作者简介:熊金生(1995—),男,硕士研究生,主要研究方向为超高强度钢,E-mail: 1579549067@qq.com。

Effect of quenching temperature on microstructure and properties of a low cobalt secondary hardening steel

Xiong Jinsheng^1,2, Ning Jing², Su Jie², Jiang Qingwei¹

1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming Yunnan 650093, China;
2. Research Institute of Special Steels, Central Iron and Steel Research Institute, Beijing 100081, China

Received:2021-11-10 Revised:2022-01-11 Online:2022-03-25 Published:2022-04-22

摘要/Abstract

摘要： 采用Thermo-Calc热力学软件计算了一种新型低钴二次硬化钢高温区间的析出相种类和含量,结合光学显微镜、扫描电镜和力学检测等试验方法,研究了淬火温度对其组织和性能的影响。结果表明,在较低温度淬火时,板条马氏体基体上存在大量富W、Mo的球状M₆C析出相。升高淬火温度,M₆C相迅速回溶,并在1060 ℃时完全溶解。M₆C相的溶解使得二次硬化效果增强、冲击性能提升,同时导致原奥氏体晶粒明显粗化,进而对强韧性产生不利影响,最终试验钢经1060 ℃淬火后获得最佳力学性能配合。

关键词: 二次硬化钢, 淬火温度, 力学性能, 析出相

Abstract: Types and contents of precipitated phases in the high temperature range of a new low cobalt secondary hardening steel were calculated by Thermo-Calc thermodynamic software. Combined with the experimental methods of optical microscope (OM), scanning electron microscope (SEM) and mechanical testing, the effect of quenching temperature on the microstructure and properties of the tested steel was studied. The results show that there are a large number of spherical W/Mo-rich M₆C precipitates on the lath martensite matrix when quenching at lower temperature. With the increase of quenching temperature, M₆C precipitates dissolves rapidly and completely dissolves at 1060 ℃. The dissolution of M₆C precipitates enhances the secondary hardening effect and improves the impact properties. At the same time, it causes the prior austenite grains to be significantly coarsened, which has an adverse impact on the strength and toughness. Finally, the tested steel obtains the optimal match of comprehensive mechanical properties after quenching at 1060 ℃.

Key words: secondary hardening steel, quenching temperature, mechanical properties, precipitated phases

中图分类号:

TG156.3

熊金生, 宁静, 苏杰, 姜庆伟. 淬火温度对低钴二次硬化钢组织和性能的影响[J]. 金属热处理, 2022, 47(3): 92-96.

Xiong Jinsheng, Ning Jing, Su Jie, Jiang Qingwei. Effect of quenching temperature on microstructure and properties of a low cobalt secondary hardening steel[J]. Heat Treatment of Metals, 2022, 47(3): 92-96.

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淬火温度对低钴二次硬化钢组织和性能的影响

Effect of quenching temperature on microstructure and properties of a low cobalt secondary hardening steel

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