In situ hydrogen embrittlement behavior of Fe-based medium entropy alloys with varying microstructures

초록

To identify hydrogen-compatible alloys for use in hydrogen-related industries, this study investigated the hydrogen embrittlement (HE) behavior of Al/C doped Cr12Ni12Mn16Fe60 medium entropy alloys, focusing on the influence of various microstructural factors on hydrogen-induced failure. Varying microstructures were obtained by altering the cooling conditions following heat treatment processes, such as water quenching, air cooling, and furnace cooling. Subsequently each sample was tensile-tested at a slow strain rate of 10-5 s- 1 under in situ electrochemical hydrogen charging to evaluate their hydrogen-assisted failure mechanisms. Based on the combined microstructural characterization and thermal desorption analysis, it was concluded that the air-cooled sample demonstrated superior intrinsic resistance to HE owing to the prevention of hydrogen accumulation at the boundaries. Overall, the new understanding derived from this study may provide guidelines for the design of alloys resistant to HE.

키워드