Atomic scale understanding of the role of hydrogen and oxygen segregation in the embrittlement of grain boundaries in a twinning induced plasticity steel

2023/02/13 by Heena Khanchandani, Baptiste Gault, Khanchandani, Heena +1
Engineering · Materials Science · #FOS: Physical sciences #Hydrogen embrittlement and corrosion behaviors in metals #Materials Science (cond-mat.mtrl-sci) #Microstructure and Mechanical Properties of Steels #Welding Techniques and Residual Stresses

paper · pdf · doi:10.48550/arxiv.2302.06317

openalex publication_date 2023/02/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Twinning induced plasticity (TWIP) steels are high strength metallic materials with potential for structural components in e.g. automotive applications. However, they are prone to hydrogen embrittlement (HE) and galvanic corrosion. We investigated the susceptibility of a model Fe 27Mn 0.3C (wt%) TWIP steel towards HE and oxidation at the sub-nanometer scale by atom probe tomography. We measured segregation of hydrogen and oxygen at grain boundaries, which appears to be associated to a strong manganese depletion. Our study suggests a correlation between HE and oxidation mechanisms in TWIP steels, which we argue can combine to favor the previously reported hydrogen enhanced decohesion (HEDE) of grain boundaries.

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