Influence of microstructural morphology on pitting corrosion resistance of duplex stainless steel weld metals

被引：0
作者：
KADOI K. [1 ]
TAKADA S. [2 ]
INOUE H. [2 ]
HOJO M. [3 ]
YOSHIOKA Y. [3 ]
机构：
[1] Joining and Welding Research Institute, Osaka University
[2] Graduate School of Engineering, Osaka University
来源：
Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society | 2021年 / 38卷 / 04期
关键词：
Duplex stainless steel; Heat input; Nitride; Nitrogen; Pitting corrosion; Weld metal;
D O I：
10.2207/QJJWS.38.263
中图分类号：
学科分类号：
摘要：
The formation mechanism of microstructure of duplex stainless steel weld metals with different N content and heat input and the effects of microstructural factors on pitting corrosion resistance of them were investigated. As N content of weld metal increased, ferrite content decreased and Cr nitride content increased. However, once N content exceeded a certain value, Cr nitride content decreased. As the ferrite content of the weld metal decreased, the critical pitting temperature (CPT) increased, and as N content increased, CPT increased. Thud, the pitting corrosion resistance of duplex stainless steel weld metals must be affected by both of N content and Cr nitride, and the precipitation of Cr nitride must be also affected by N content and the ferrite content due to N content and the weld heat input. The results indicated that these microstructural factors was important index to evaluate the pitting corrosion resistance of duplex stainless steel weld metals. © 2020 Japan Welding Society. All rights reserved.
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页码：263 / 268
页数：5
相关论文
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