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. ^{[1
]}

Hojo M. ^{[3
]}

Yoshioka Y. ^{[3
]}

机构：

[1] Joining and Welding Research Institute, Osaka University, Osaka

[2] Graduate School of Engineering, Osaka University, Osaka

[3] Research Development Center, Nippon Steel Stainless Steel Corporation, Yamaguchi

来源：

Welding International | 2020年 / 34卷 / 4-6期

关键词：

Duplex stainless steel; heat input; nitride; nitrogen; pitting corrosion; weld metal;

D O I：

10.1080/09507116.2021.1921997

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. Thus, 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 also be affected by N content and the ferrite content due to N content and the weld heat input. The results indicated that these microstructural factors were an important index to evaluate the pitting corrosion resistance of duplex stainless steel weld metals. © 2021 Informa UK Limited, trading as Taylor & Francis Group.

引用

页码：176 / 184

页数：8

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