氮含量及固溶温度对21-6-9奥氏体不锈钢组织和硬度的影响

doi:10.13251/j.issn.0254-6051.2021.12.012

金属热处理 ›› 2021, Vol. 46 ›› Issue (12): 76-80.DOI: 10.13251/j.issn.0254-6051.2021.12.012

氮含量及固溶温度对21-6-9奥氏体不锈钢组织和硬度的影响

闫治坤^1,2, 陈海涛², 郎宇平², 屈华鹏², 冯翰秋², 刘荣佩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所, 北京 100081

收稿日期:2021-09-19 出版日期:2021-12-25 发布日期:2022-02-18
通讯作者: 刘荣佩,教授,硕士,E-mail:522439273@qq.com
作者简介:闫治坤(1996—),男,硕士研究生,主要研究方向为不锈钢及耐蚀合金,E-mail:1986917421@qq.com。

Effects of nitrogen content and solution treatment temperature on microstructure and hardness of 21-6-9 austenitic stainless steel

Yan Zhikun^1,2, Chen Haitao², Lang Yuping², Qu Huapeng², Feng Hanqiu², Liu Rongpei¹

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:2021-09-19 Online:2021-12-25 Published:2022-02-18

摘要/Abstract

摘要： 为了探讨氮含量及固溶温度对21-6-9不锈钢组织和硬度的影响,分别在950、1000、1050和1100 ℃对3种不同氮含量的热轧态21-6-9不锈钢进行1 h固溶处理,通过光学显微镜观察其组织结构,结合Thermo-Calc热力学计算对试验钢的微观组织进行分析,并对其进行硬度测试。结果表明,0.20%~0.28%N的21-6-9不锈钢热轧后沿轧制方向析出铁素体,且钢中铁素体经950~1100 ℃固溶处理可消除,当N含量达到0.34%时,试验钢中不再出现铁素体。随着固溶处理温度的升高,21-6-9不锈钢的晶粒组织长大,硬度降低。N含量的增加可显著提高固溶态21-6-9不锈钢的硬度,其增加程度随固溶处理温度的升高而减弱。

关键词: 21-6-9不锈钢, 固溶处理, 显微组织, 硬度

Abstract: In order to investigate the effect of nitrogen content and solution treatment temperature on microstructure and hardness of 21-6-9 stainless steel, three kinds of hot rolled 21-6-9 stainless steel with different nitrogen contents were solution treated at 950, 1000, 1050, and 1100 ℃ for 1 h, respectively, of which the microstructure was observed by optical microscope. Combined with Thermo-Calc thermodynamic calculation, the microstructure of the tested steel was analyzed and the hardness was tested. The results show that ferrite precipitates in the 21-6-9 stainless steel with 0.20%-0.28%N along the rolling direction after hot rolling, and the ferrite in the steel with 0.20%-0.28%N can be eliminated by solution treatment at 950-1000 ℃. When the N content reaches 0.34%, the ferrite no longer appears in the tested steel. With the increase of solution treatment temperature, grain growth occurs in the 21-6-9 stainless steel and the hardness decreases. With the increase of N content, the hardness of the 21-6-9 stainless steel in solution treated state can be significantly increased, while the increasing degree decreases with the increase of solution treatment temperature.

Key words: 21-6-9 stainless steel, solid solution treatment, microstructure, hardness

中图分类号:

TG161

闫治坤, 陈海涛, 郎宇平, 屈华鹏, 冯翰秋, 刘荣佩. 氮含量及固溶温度对21-6-9奥氏体不锈钢组织和硬度的影响[J]. 金属热处理, 2021, 46(12): 76-80.

Yan Zhikun, Chen Haitao, Lang Yuping, Qu Huapeng, Feng Hanqiu, Liu Rongpei. Effects of nitrogen content and solution treatment temperature on microstructure and hardness of 21-6-9 austenitic stainless steel[J]. Heat Treatment of Metals, 2021, 46(12): 76-80.

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氮含量及固溶温度对21-6-9奥氏体不锈钢组织和硬度的影响

Effects of nitrogen content and solution treatment temperature on microstructure and hardness of 21-6-9 austenitic stainless steel

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