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Effect of δ-ferrite on susceptibility to hydrogen embrittlement of 304 austenitic stainless steel in high-pressure hydrogen atmosphere

Fan Bao (College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou, China)
Kaiyu Zhang (College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou, China)
Zhengrong Zhou (College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou, China)
Wenli Zhang (College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou, China)
Xiao Cai (Shanghai Geely Company Limited, Shanghai, China)
Lin Zhang (Zhejiang University of Technology, Hangzhou, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 28 May 2021

Issue publication date: 2 July 2021

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Abstract

Purpose

The purpose of this paper is to demonstrate the effect of δ-ferrite on the susceptibility to hydrogen embrittlement of type 304 stainless steel in hydrogen gas environment.

Design/methodology/approach

The mechanical properties of as-received and solution-treated specimens were investigated by the test of tensile and fatigue crack growth (FCG) in 5 MPa argon and hydrogen.

Findings

The presence of δ-ferrite reduced the relative elongation and the relative reduction area (H2/Ar) of 304 stainless steel, indicating that δ-ferrite increased the susceptibility of hydrogen embrittlement in 304 stainless steel. Moreover, δ-ferrite promoted the fatigue crack initiation and propagation at the interface between δ-ferrite and austenite. The FCG tests were used to investigate the effect of δ-ferrite on the FCG rate in hydrogen gas environment, and it was found that δ-ferrite accelerated the FCG rate, which was attributed to rapid diffusion and accumulation of hydrogen around the fatigue crack tip through δ-ferrite in high-pressure hydrogen gas environment.

Originality/value

The dependence of the susceptibility to hydrogen embrittlement on δ-ferrite was first investigated in type 304 steel in hydrogen environment with high pressures, which provided the basis for the design and development of a high strength, hydrogen embrittle-resistant austenitic stainless steel.

Keywords

Acknowledgements

This research was supported by the National Key Research and Development Program of China (2019YFB150530202), the National Natural Science Foundation of China (51971204) and the Zhejiang Provincial Natural Science Foundation of China (LY19E010006).

Citation

Bao, F., Zhang, K., Zhou, Z., Zhang, W., Cai, X. and Zhang, L. (2021), "Effect of δ-ferrite on susceptibility to hydrogen embrittlement of 304 austenitic stainless steel in high-pressure hydrogen atmosphere", Anti-Corrosion Methods and Materials, Vol. 68 No. 3, pp. 202-208. https://doi.org/10.1108/ACMM-11-2020-2403

Publisher

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Emerald Publishing Limited

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