Abstract
The hydrogen embrittlement micromechanisms and the effect of carbon interstitial on hydrogen distribution were characterized in Fe40Mn40Ni10Cr10 and Fe38Mn41Ni10Cr10C1 medium entropy alloy. Ex-situ microstructural observations revealed that the segregation of carbon on grain boundaries suppresses hydrogen from being trapped in the grain boundaries for carbon-doped alloy before deformation. However, the distribution of hydrogen was similar for both alloys after plastic strain so that the grain boundaries trapped a large fraction of hydrogen during deformation. The fully intergranular fracture mode in the hydrogen affected area of both alloys was explained by the synergy of grain boundary–dislocation reactions and hydrogen-enhanced grain boundary decohesion effects.
Published Version
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