Abstract
In the present study, the H absorption and the H embrittlement (HE) resistance of medium (3–7 wt%) Mn martensitic steels were investigated. When the specimens were electrochemically H-charged, 7 wt% Mn specimen had the highest diffusible H content because of the highest reversible H trap density. When the diffusible H content was identical, HE resistance deterioration arose due to the Mn addition, probably caused by grain boundary decohesion and H segregation into the grain boundaries. However, this condition was improved by B addition due to the enhanced grain boundary cohesion and the suppression of H segregation into the grain boundaries.
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