深冷处理对440C马氏体不锈钢组织和耐蚀性的影响

doi:10.13251/j.issn.0254-6051.2022.08.025

金属热处理 ›› 2022, Vol. 47 ›› Issue (8): 152-157.DOI: 10.13251/j.issn.0254-6051.2022.08.025

深冷处理对440C马氏体不锈钢组织和耐蚀性的影响

李慧东^1,2, 张覃轶^1,2, 刘伟³, 孙伟¹, 伍冬^1,2

1.武汉理工大学材料科学与工程学院, 湖北武汉 430070;
2.阳江合金材料实验室, 广东阳江 529500;
3.阳江拓必拓工业技术研究院有限公司, 广东阳江 529500

收稿日期:2022-03-09 修回日期:2022-06-08 出版日期:2022-08-25 发布日期:2022-09-19
通讯作者: 张覃轶,副教授,博士,E-mail:zhqy@whut.edu.cn
作者简介:李慧东(1995—),男,硕士研究生,主要研究方向为热处理工艺及耐蚀性评价,E-mail:lhdazy@163.com。
基金资助:
阳江市科技计划(SDZX2019041)

Effect of deep cryogenic treatment on microstructure and corrosion resistance of 440C martensitic stainless steel

Li Huidong^1,2, Zhang Qinyi^1,2, Liu Wei³, Sun Wei¹, Wu Dong^1,2

1. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan Hubei 430070, China;
2. Yangjiang Advanced Alloys Laboratory, Yangjiang Guangdong 529500, China;
3. Yangjiang Tuobituo Industrial Technology Research Institute Co., Ltd., Yangjiang Guangdong 529500, China

Received:2022-03-09 Revised:2022-06-08 Online:2022-08-25 Published:2022-09-19

摘要/Abstract

摘要： 研究了深冷处理对440C马氏体不锈钢组织和耐蚀性的影响。研究表明,液氮深冷处理后440C不锈钢硬度可提高2.3 HRC,残留奥氏体含量降低了11.7%,72 h中性盐雾试验表面无明显点蚀。440C不锈钢淬火后室温停留2 h以上残留奥氏体含量明显增加,硬度值、耐蚀性下降。实际生产中,淬火与液氮深冷处理时间间隔应不超过2 h。

关键词: 440C马氏体不锈钢, 深冷处理, 残留奥氏体, 耐蚀性

Abstract: Effect of deep cryogenic treatment on microstructure and corrosion resistance of 440C martensitic stainless steel was investigated. The results show that the hardness of the 440C stainless steel can be increased by 2.3 HRC after liquid nitrogen cryogenic treatment, the retained austenite content is reduced by 11.7%, and there is no obvious pitting on the surface after 72 h neutral salt spray test. The retained austenite content of the 440C stainless steel increases significantly when the room temperature retention time is more than 2 h after quenching, and the hardness and corrosion resistance decrease. It is suggested that the retention time at room temperature after quenching is less than 2 h if the 440C steel is subjected to liquid nitrogen cryogenic treatment.

Key words: 440C martensitic stainless steel, deep cryogenic treatment, retained austenite, corrosion resistance

中图分类号:

TG156

李慧东, 张覃轶, 刘伟, 孙伟, 伍冬. 深冷处理对440C马氏体不锈钢组织和耐蚀性的影响[J]. 金属热处理, 2022, 47(8): 152-157.

Li Huidong, Zhang Qinyi, Liu Wei, Sun Wei, Wu Dong. Effect of deep cryogenic treatment on microstructure and corrosion resistance of 440C martensitic stainless steel[J]. Heat Treatment of Metals, 2022, 47(8): 152-157.

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深冷处理对440C马氏体不锈钢组织和耐蚀性的影响

Effect of deep cryogenic treatment on microstructure and corrosion resistance of 440C martensitic stainless steel

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