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Meeting 2026 TMS Annual Meeting & Exhibition
Symposium Chemistry and Physics of Interfaces
Presentation Title Roles of Σ3 grain boundary in hydrogen embrittlement of steels
Author(s) Motomichi Koyama, Hiroshi Kakinuma
On-Site Speaker (Planned) Motomichi Koyama
Abstract Scope Σ3 grain boundaries are resistant to hydrogen embrittlement in both austenitic and martensitic steels. According to crystallographic analysis, Σ3 grain boundary segments of martensitic steels possess similar hydrogen embrittlement resistance to that of low-angle grain boundaries. In case of austenitic steels such as high-Mn steels, Σ3 grain boundaries show hydrogen-assisted cracking, which is related to the fact that austenitic steels show hydrogen embrittlement fracture after significant plastic deformation (over 30% tensile strain). The large plastic deformation disturbs the coherency of Σ3 grain boundary (twin boundary). The distorted portion of Σ3 grain boundary can act as a hydrogen localization site. To further prove this fact, we recently carried out hydrogen mapping using polyaniline for pure Ni which is a model material of austenitic steels. This experiment clarified that the incoherent portion of Σ3 twin boundaries acted as a hydrogen localization site while the coherent portion did not.
Proceedings Inclusion? Planned:
Keywords Iron and Steel, Mechanical Properties, Environmental Effects

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