Transactions of Materials and Heat Treatment

Title：Hydrogen embrittlement behavior on solid solution 304 austenitic stainless steel

Authors： Zhang Huiyun1 Sun Xiaosi1 Sun Ying1 Zheng Liuwei2

Unit： 1. Department of Metallurgical Engineering Shanxi Engineering Vocational College 2. School of Materials Science and Engineering Taiyuan University of Technology

KeyWords： austenitic stainless steel hydrogen embrittlement α′-martensite grain boundary twin boundary

ClassificationCode：TG142.71

year,vol(issue):pagenumber：2024,49(11):189-201

Abstract：

The interaction between the static and dynamic microstructure evolution of solid solution 304 austenitic stainless steel (ASS) with homogeneous austenitic structure and hydrogen was studied. The results show that solid solution ASS has low sensitivity to hydrogen embrittlement and good resistance to hydrogen embrittlement, but low strength, making it suitable for situations where high resistance to hydrogen embrittlement is required, but low strength is not. Then, through in-situ tensile experiments, it is revealed that tensile deformation promoted α′-martensite transformation, while hydrogen is used as a defect to reduce the layer fault energy, further promoting α′-martensite transformation, which nucleates at the twin boundary and slip bands. After the hydrogen charging and tensile fracture of solid solution ASS, the brittle fracture at the edge is river shaped cleavage fracture and tearing edge quasi-cleavage fracture. On the one hand, hydrogen promotes the martensitic transformation, and enhances the stress concentration and the strain localization at the twin boundary of the material on the other hand. During the tensile process, micro-cracks initiates and propagate along the nucleation position of α′-martensite, that is, the twin boundary, while promoting the dislocation movement at the crack tip, leading to the material fracture.

Funds：

山西省高等学校科技创新项目（2024L592）；山西工程职业学院2024年度揭榜挂帅课题（KY2024-1）；山西省科技计划青年科学研究项目（202303021212306）；2023 年山西省职业教育教学改革与实践研究项目（202301005）；山西工程职业学院校企合作课题（XQ2022-01）

作者简介：张慧云（1987-），女，博士，副教授 E-mail：245883278@qq.com

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