Influence of Microstructure and Phase Distribution on the Hydrogen Embrittlement of Multicomponent Alloys Fe20Mn20Cr20Ni20Co19.2N0.8 and Fe20Mn20Cr20Ni20Co18.6N1.4

Abstract—The hydrogen embrittlement of Fe20Mn20Cr20Ni20Co20–xNx alloys (x = 0.8, 1.4 at %) with disperse Cr2N particles is studied. The formation of grain-boundary nitrides is shown to favor a decrease in the hydrogen embrittlement index, unlike a fine-grained structure with homogeneously distributed particles. The influence of the interfaces formed during precipitation hardening of the alloys on the fracture micromechanisms in the hydrogen-induced brittle surface zone is described.