Effect of nitrogen content on microstructure, mechanical properties, and corrosion behaviour of coarse-grained heat-affected zone of nitrogen-containing austenitic stainless steel

Jianguo Li; Huan Li; Zhangyin Xu; Jichun Yang; Lijun Yang

doi:10.3139/146.111823

Article

Effect of nitrogen content on microstructure, mechanical properties, and corrosion behaviour of coarse-grained heat-affected zone of nitrogen-containing austenitic stainless steel

Jianguo Li , Huan Li , Zhangyin Xu , Jichun Yang and Lijun Yang

Published/Copyright: October 4, 2019

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From the journal International Journal of Materials Research Volume 110 Issue 10

Abstract

The microstructures and properties of austenitic stainless steel with varying nitrogen content after welding thermal simulation were investigated. The results indicate that the nitrogen fraction has a considerable influence on the phase composition and properties. Low nitrogen fraction leads to formation of δ-ferrite. After a welding thermal cycle, the number of annealing twins of high nitrogen-containing steel decreases, M₂₃C₆ precipitates, and fine M₂₃C₆ are observed. For low nitrogen-containing steel, large-size M₂₃C₆ and elongated δ-ferrite are formed, which deteriorate the ductility. Meanwhile, equilibrium phase calculations also reveal the inhibiting effect of nitrogen on M₂₃C₆ and δ-ferrite. Furthermore, susceptibility to intergranular attack by 10 % oxalic acid solution was detected, and the synergistic effect of coherent twin boundaries, M₂₃C₆, and δ-ferrite leads to low resistance to corrosion for low nitrogen-containing steel.

Keywords: Nitrogen-containing austenitic stainless steel; Welding thermal simulation; Mechanical properties; Corrosion behaviour

∗Correspondence address, Professor Lijun Yang, Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, No. 135, Yaguan Road, Jinnan District, Tianjin, 300072, P.R. China, Tel: +8613622152352, e-mail: yljabc@tju.edu.cn, Web: http://mse.tju.edu.cn/teacher/detail/212

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Received: 2018-12-06

Accepted: 2019-05-10

Published Online: 2019-10-04

Published in Print: 2019-10-16

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https://doi.org/10.3139/146.111823

Keywords for this article

Nitrogen-containing austenitic stainless steel; Welding thermal simulation; Mechanical properties; Corrosion behaviour