ArticleProceedings of the National Academy of Sciences of the United States of America2025
Synergistic hydrogen embrittlement in high-strength steels.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Hydrogen embrittlement (HE) remains a critical scientific challenge in building reliable infrastructure for a carbon-free hydrogen economy. Predictive models for hydrogen-induced material failure are still lacking, largely due to an incomplete understanding of hydrogen's effects on deformation behavior, especially in multiphase alloys with complex compositions and microstructures. Here, we demonstrate a synergistic hydrogen embrittlement (SHE) phenomenon in high-strength martensitic steels, where hydrogen interacts with carbon in solution to activate hydrogen-enhanced localized plasticity (HELP). Microcantilever bending tests revealed greater hydrogen susceptibility with higher carbon content, evidenced by a significant reduction in work-hardening capacity, promoting slip localization and reduced ductility. First-principles calculations and theoretical modeling revealed that carbon intensifies hydrogen-dislocation interactions and amplifies hydrogen redistribution around screw dislocations, inhibiting cross-slip. This work integrates experimental and modeling approaches to elucidate the synergistic interactions between hydrogen and solute elements, providing critical insights for designing high-strength, hydrogen-tolerant structural materials.
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