Effect of nitrogen on microstructure and corrosion resistance of Cr15 super martensitic stainless steel

被引：12
作者：
Chang, Ruijin [1 ]
Li, Jingyuan [1 ]
Gu, Jinbo [1 ]
机构：
[1] Univ Sci & Technol, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
来源：
CORROSION ENGINEERING SCIENCE AND TECHNOLOGY | 2019年 / 54卷 / 03期
基金：
国家重点研发计划; 中国国家自然科学基金;
关键词：
Super martensitic stainless steel; nitrogen; austenite; galvanic corrosion; DELTA-FERRITE; BEHAVIOR; EROSION;
D O I：
10.1080/1478422X.2019.1567028
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
To investigate the influence of nitrogen on structure and corrosion resistance of Cr15 super martensitic stainless steels (SMSS), two types (N-free and N-0.12%) of specimens were quenched at 1050 degrees C and tempered at different temperatures, and then, optical microscope, transmission electron microscopy, X-ray diffraction, potentiodynamic polarisation, immersion experiments and Kelvin Probe Force Microscope were used to characterize its microstructures and corrosion properties. The experimental results show that the microstructure in the N-free Cr15 super martensitic stainless steel is a biphasic tissue with alternating martensite and austenite distribution while quenched at 1050 degrees C and tempered between 600 and 700 degrees C. The nitrogen addition increases the content of austenite, and changes the austenite morphology significantly into the coarse block and strip distribution. What's more, micro-galvanic corrosion is formed between austenite and martensite, which deteriorates the corrosion resistance of the SMSS.
引用
收藏
页码：225 / 232
页数：8
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