Mo含量对9Cr18Mo钢组织及耐蚀性的影响

doi:10.13251/j.issn.0254-6051.2023.12.040

金属热处理 ›› 2023, Vol. 48 ›› Issue (12): 244-249.DOI: 10.13251/j.issn.0254-6051.2023.12.040

Mo含量对9Cr18Mo钢组织及耐蚀性的影响

周健^1,2, 骈利平², 方峰¹, 迟宏宵², 马党参²

1.东南大学材料科学与工程学院, 江苏南京 211189;
2.钢铁研究总院有限公司特殊钢研究院, 北京 100081

收稿日期:2023-07-11 修回日期:2023-10-28 出版日期:2023-12-25 发布日期:2024-01-29
作者简介:周健(1983—),男,高级工程师,博士,主要研究方向为模具钢新材料,E-mail:zhou-jian-168@163.com
基金资助:
河北省重大科技成果转化专项(22281003Z)

Effect of Mo content on microstructure and corrosion resistance of 9Cr18Mo steel

Zhou Jian^1,2, Pian Liping², Fang Feng¹, Chi Hongxiao², Ma Dangshen²

1. School of Materials Science and Engineering, Southeast University, Nanjing Jiangsu 211189, China;
2. Research Institute of Special Steels, Central Iron and Steel Research Institute Co., Ltd., Beijing 100081, China

Received:2023-07-11 Revised:2023-10-28 Online:2023-12-25 Published:2024-01-29

摘要/Abstract

摘要： 采用显微组织分析、电化学试验以及中性盐雾试验等方法研究了4种不同Mo含量的9Cr18Mo钢显微组织及耐蚀性,探讨了Mo对耐蚀性的影响机理。结果表明,不同Mo含量的9Cr18Mo钢都具有大量的富铬碳化物,碳化物尺寸、数量及硬度随着Mo含量增加而增加;当Mo含量小于0.5%时,腐蚀电位随着Mo含量增加而升高,但当Mo质量达到0.7%时,腐蚀电位下降;经120 h中性盐雾试验,0.5Mo试验钢腐蚀速率较低。含0.7%Mo试样耐点蚀性能的下降与富铬碳化物的形成及碳化物与基体界面附近贫铬区的形成有关。

关键词: 9Cr18Mo钢, Mo含量, 腐蚀电位, 点蚀, 耐蚀性能

Abstract: Microstructure and corrosion resistance of the 9Cr18Mo steel with four different Mo contents were studied by microstructure analysis, electrochemical test and neutral salt spray test, then the influence mechanism of Mo on the corrosion resistance was discussed. The results show that the 9Cr18Mo steel with different Mo contents has a large number of chromium-rich carbides, and the size, quantity and hardness of carbides increase with the increase of Mo content. When the Mo content is less than 0.5%, the corrosion potential increases with the increase of Mo content, but decreases when the Mo content reaches 0.7%. After 120 h neutral salt spray test, the corrosion rate of 0.5Mo tested steel is low. The decrease of pitting corrosion resistance of the specimen containing 0.7% Mo is related to the formation of chromium-rich carbides and the formation of chromium-poor zone near the interface between the carbide and matrix.

Key words: 9Cr18Mo steel, Mo content, corrosion potential, pitting, corrosion resistance

中图分类号:

TG124.24

周健, 骈利平, 方峰, 迟宏宵, 马党参. Mo含量对9Cr18Mo钢组织及耐蚀性的影响[J]. 金属热处理, 2023, 48(12): 244-249.

Zhou Jian, Pian Liping, Fang Feng, Chi Hongxiao, Ma Dangshen. Effect of Mo content on microstructure and corrosion resistance of 9Cr18Mo steel[J]. Heat Treatment of Metals, 2023, 48(12): 244-249.

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Mo含量对9Cr18Mo钢组织及耐蚀性的影响

Effect of Mo content on microstructure and corrosion resistance of 9Cr18Mo steel

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