深冷处理后回火温度对15Cr超级马氏体不锈钢组织及耐点蚀性能的影响

doi:10.13251/j.issn.0254-6051.2020.11.012

金属热处理 ›› 2020, Vol. 45 ›› Issue (11): 62-67.DOI: 10.13251/j.issn.0254-6051.2020.11.012

深冷处理后回火温度对15Cr超级马氏体不锈钢组织及耐点蚀性能的影响

何潇¹, 李俊¹, 李绍宏¹, 赵昆渝¹, 梁建雄², 苏杰²

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:2020-04-26 出版日期:2020-11-25 发布日期:2020-12-29
通讯作者: 赵昆渝,教授,E-mail: kyzhaoy@sina.com
作者简介:何潇(1995—), 女,硕士研究生,主要研究方向为高合金轴承钢,E-mail:1542301974@qq.com。
基金资助:
国家高技术研究发展计划(863计划)(201203A503)

Effects of tempering temperature after cryogenic treatment on microstructure and pitting resistance of 15Cr super martensite stainless steel

He Xiao¹, Li Jun¹, Li Shaohong¹, Zhao Kunyu¹, Liang Jianxiong², Su Jie²

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

Received:2020-04-26 Online:2020-11-25 Published:2020-12-29

摘要/Abstract

摘要： 利用场发射扫描电镜、透射电镜以及电化学综合测试系统对15Cr超级马氏体不锈钢(SMSS)经不同热处理工艺处理后的显微组织变化和第二相碳化物及其对该钢腐蚀行为的影响进行了研究。结果表明,试验钢经不同热处理工艺处理后组织均由板条马氏体、奥氏体以及M₂₃C₆型碳化物颗粒组成,随着回火温度的增加,试验钢中逆变奥氏体含量增加,且在650 ℃回火时达到体积分数最大值41.41%。当回火温度高于600 ℃时第二相碳化物开始析出,且650 ℃回火后碳化物数量及尺寸较600 ℃增多。点蚀电位随着回火温度的增加而降低,第二相碳化物的析出降低了试验钢的点蚀电位,促进了亚稳点蚀位置的形成,从而降低了试验钢的耐腐蚀性能。

关键词: 深冷处理, 15Cr超级马氏体不锈钢(SMSS), M₂₃C₆型碳化物, 腐蚀

Abstract: Microstructure evolution and second phase carbides of 15Cr super martensitic stainless steel (SMSS) treated by different heat treatment processes and their influence on the corrosion behavior were investigated by means of field emission scanning electron microscope (SEM), transmission electron microscope (TEM) and electrochemical comprehensive testing system. The results show that the microstructure of the tested steel are composed of martensite, austenite and M₂₃C₆ carbides after different heat treatment processes. With the increase of tempering temperature, the volume fraction of reversed austenite in the tested steel increases and reaches a maximum value of 41.41% at 650 ℃. The second phase carbides appear when the tempering temperature is higher than 600 ℃, besides, the quantity and the size of carbide after tempering at 650 ℃ are larger than that at 600 ℃.The pitting potential decreases with the increase of tempering temperature, the precipitation of carbides reduces the pitting potential of the stainless steel, promotes the formation of metastable pitting, and reduces the corrosion resistance of 15Cr stainless steel.

Key words: cryogenic treatment, 15Cr super martensite stainless steel(SMSS), M₂₃C₆ carbides, corrosion

中图分类号:

TG161

何潇, 李俊, 李绍宏, 赵昆渝, 梁建雄, 苏杰. 深冷处理后回火温度对15Cr超级马氏体不锈钢组织及耐点蚀性能的影响[J]. 金属热处理, 2020, 45(11): 62-67.

He Xiao, Li Jun, Li Shaohong, Zhao Kunyu, Liang Jianxiong, Su Jie. Effects of tempering temperature after cryogenic treatment on microstructure and pitting resistance of 15Cr super martensite stainless steel[J]. Heat Treatment of Metals, 2020, 45(11): 62-67.

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深冷处理后回火温度对15Cr超级马氏体不锈钢组织及耐点蚀性能的影响

Effects of tempering temperature after cryogenic treatment on microstructure and pitting resistance of 15Cr super martensite stainless steel

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