冷却速度对超高强马氏体钢的马氏体相变起始温度和硬度的影响

doi:10.13251/j.issn.0254-6051.2022.07.032

金属热处理 ›› 2022, Vol. 47 ›› Issue (7): 183-189.DOI: 10.13251/j.issn.0254-6051.2022.07.032

冷却速度对超高强马氏体钢的马氏体相变起始温度和硬度的影响

李春辉^1,2, 李晓源², 尉文超², 王毛球², 吴润¹

1.武汉科技大学材料与冶金学院, 湖北武汉 430081;
2.钢铁研究总院有限公司特殊钢研究院, 北京 100081

收稿日期:2022-02-12 修回日期:2022-05-17 出版日期:2022-07-25 发布日期:2022-08-12
通讯作者: 李晓源,正高级工程师,博士,E-mail:lixiaoyuan@nercast.com
作者简介:李春辉(1994—),男,硕士研究生,主要研究方向为先进钢铁材料,E-mail:lichunhui10234@163.com。

Effect of cooling rate on martensitic transformation initiation temperature and hardness of super high strength martensitic steel

Li Chunhui^1,2, Li Xiaoyuan², Yu Wenchao², Wang Maoqiu², Wu Run¹

1. School of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan Hubei 430081, China;
2. Research Institute of Special Steel, Central Iron and Steel Research Institute Co., Ltd., Beijing 100081, China

Received:2022-02-12 Revised:2022-05-17 Online:2022-07-25 Published:2022-08-12

摘要/Abstract

摘要： 采用热膨胀法测量了马氏体试验钢在20~70 ℃/s冷却速度下的马氏体相变起始温度(Ms点温度),并研究了其对试验钢硬度的影响。结果表明,冷却速度的提高可增加奥氏体强度、提高奥氏体的热稳定性,进而降低马氏体相变起始温度。同时,更高的冷却速度容易造成晶格畸变,增大位错密度,还会提高过冷度,细化有效晶粒尺寸,使试验钢的硬度提高。

关键词: 马氏体钢, 冷却速度, Ms点温度, 硬度

Abstract: Martensite transformation initiation temperature (Ms temperature) of martensitic steel with cooling rate of 20-70 ℃/s was measured by thermal expansion method, and its effect on hardness of the tested steel was studied. The results show that the increase of cooling rate enhances the strength of austenite, improves the thermal stability of austenite, and then decreases the initiation temperature of martensite transformation. At the same time, a higher cooling rate is more likely to cause lattice distortion, increase the dislocation density, increase the degree of undercooling and refine the effective grain size, which increases the hardness of the tested steel.

Key words: martensitic steel, cooling rate, Ms point temperature, hardness

中图分类号:

TG156

李春辉, 李晓源, 尉文超, 王毛球, 吴润. 冷却速度对超高强马氏体钢的马氏体相变起始温度和硬度的影响[J]. 金属热处理, 2022, 47(7): 183-189.

Li Chunhui, Li Xiaoyuan, Yu Wenchao, Wang Maoqiu, Wu Run. Effect of cooling rate on martensitic transformation initiation temperature and hardness of super high strength martensitic steel[J]. Heat Treatment of Metals, 2022, 47(7): 183-189.

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冷却速度对超高强马氏体钢的马氏体相变起始温度和硬度的影响

Effect of cooling rate on martensitic transformation initiation temperature and hardness of super high strength martensitic steel

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