Hydrogen embrittlement micromechanisms and direct observations of hydrogen transportation by dislocations during deformation in a carbon-doped medium entropy alloy

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 hy...

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Bibliographic Details
Published in:Journal of materials research and technology 2022-09, Vol.20, p.18-25
Main Authors: Kim, Dong-Han, Moallemi, Mohammad, Kim, Kyung-Shik, Kim, Sung-Joon
Format: Article
Language:English
Subjects:
Carbon segregation
Hydrogen accumulation
Hydrogen embrittlement
Hydrogen-enhanced decohesion
Hydrogen-enhanced localized plasticity
Medium entropy alloy
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Summary: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.
ISSN:2238-7854
DOI:10.1016/j.jmrt.2022.07.061