Effects of laser welding on the microstructure evolution and corrosion resistance of a novel nitrogen-containing austenitic stainless steel QN2109

Xiangyu Wang; Pei He; Qingyuan Zhou; Qingmao Kong; Chun Zheng; Yangting Sun; Jin Li; Laizhu Jiang; Yiming Jiang

Journal of Materials Research and Technology (May 2023)

Effects of laser welding on the microstructure evolution and corrosion resistance of a novel nitrogen-containing austenitic stainless steel QN2109

Xiangyu Wang,
Pei He,
Qingyuan Zhou,
Qingmao Kong,
Chun Zheng,
Yangting Sun,
Jin Li,
Laizhu Jiang,
Yiming Jiang

Affiliations

Xiangyu Wang: Department of Materials Science, State Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai, 200438, PR China
Pei He: Department of Materials Science, State Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai, 200438, PR China
Qingyuan Zhou: Department of Materials Science, State Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai, 200438, PR China
Qingmao Kong: Qing Tuo Group Co., Ltd., Ningde, 355006, PR China; Department of Materials Science and Technology, Chongqing University, Chongqing, 40044, PR China
Chun Zheng: Qing Tuo Group Co., Ltd., Ningde, 355006, PR China; Zhejiang University, Hangzhou, 310027, PR China
Yangting Sun: Department of Materials Science, State Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai, 200438, PR China
Jin Li: Department of Materials Science, State Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai, 200438, PR China
Laizhu Jiang: Qing Tuo Group Co., Ltd., Ningde, 355006, PR China
Yiming Jiang: Department of Materials Science, State Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai, 200438, PR China; Corresponding author.

Journal volume & issue: Vol. 24
pp. 303 – 317

Abstract

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After laser welding, the corrosion resistance and microstructure of a newly developed austenitic stainless steel, QN2109, were investigated. A negligible heat-affected zone was found and the segregation of Cr, Mo, Mn, Ni, and N was revealed by EPMA. In contrast to previously reported findings, the corrosion resistance of δ-ferrite obtained here was lower than that of austenite in acidic solutions revealed by SKPFM and MFM, owing to N segregation. The pitting resistance of whole welds was lower than that of base metal (BM), whereas the pitting resistance of the fusion zone was higher than that of BM, owing to the significant decrease in the number of inclusions.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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