A novel approach to assess hydrogen embrittlement (HE) susceptibility and mechanisms in high strength martensitic steels

A rapid fracture test in four-point bending is proposed to assess hydrogen embrittlement (HE) susceptibility of high strength martensitic steels. The novelty of this technique is the rapid rate of loading, whereas conventional approaches require prolonged slow strain rate testing. The essential frac...

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Bibliographic Details
Published in:arXiv.org 2020-12
Main Authors: Das, Tuhin, Brahimi, Salim V, Song, Jun, Yue, Stephen
Format: Article
Language:English
Subjects:
Finite element method
Fracture testing
High strength
Hydrogen
Hydrogen embrittlement
Martensitic stainless steels
Mathematical analysis
Mechanical tests
Quenching and tempering
Slow strain rate
Stress concentration
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Summary:A rapid fracture test in four-point bending is proposed to assess hydrogen embrittlement (HE) susceptibility of high strength martensitic steels. The novelty of this technique is the rapid rate of loading, whereas conventional approaches require prolonged slow strain rate testing. The essential fractographic features required to identify the mechanisms of HE failure remain evident, despite the fast loading conditions. To demonstrate these attributes, two quenched and tempered steels at two different strength levels were tested, with and without pre-charging of hydrogen. Stress coupled hydrogen diffusion finite element analysis (FEA) was performed to calculate both stress and hydrogen concentration distributions. In addition to fractographic analysis, a mechanistic description rooted in hydrogen enhanced decohesion (HEDE) mechanism was used to corroborate the mechanical test data. The study shows that the approach is capable of quantifying HE susceptibility by being responsive to key factors affecting hydrogen induced fracture, thus developing further understanding on the HE of martensitic steels.
ISSN:2331-8422
DOI:10.48550/arxiv.2012.10112