Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Comparative Study on the Hydrogen Embrittlement Behavior of Additively Manufactured 316L Stainless Steel and CoCrFeNi Medium-Entropy Alloy

적층제조된 316L 스테인리스강 및 CoCrFeNi 중엔트로피 합금의 수소취화 거동 비교

  • Jae Yeong Jung (Department of Materials Science and Engineering, Chungnam National University) ;
  • Ji Yoon Jung (Department of Materials Science and Engineering, Chungnam National University) ;
  • Dong-Hyun Lee (Department of Materials Science and Engineering, Chungnam National University)
  • 정재영 (충남대학교 신소재공학과) ;
  • 정지윤 (충남대학교 신소재공학과) ;
  • 이동현 (충남대학교 신소재공학과)
  • Received : 2024.09.09
  • Accepted : 2024.09.20
  • Published : 2024.09.30
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Abstract

In this study, hydrogen embrittlement was investigated for 316L stainless steel (SS316L) and CoCrFeNi medium-entropy alloy (MEA) fabricated by laser-powder bed fusion. The in-situ hydrogen charging tensile tests revealed that the reduction in ductility due to hydrogen was more significant in the CoCrFeNi MEA, compared to the SS316L. In the case of SS316L, hydrogen-assisted cracks (HACs) were observed mainly on the surface, whereas in CoCrFeNi, cracks were found not only at the edges but also in the central region. HACs analysis confirmed that transgranular (TG) cracks were predominant in SS316L, whereas only intergranular cracks were formed in the CoCrFeNi MEA. The difference in hydrogen embrittlement resistance between SS316L and CoCrFeNi was discussed in terms of the differences in deformation microstructure and hydrogen diffusivity, as investigated through electron channeling contrast imaging and nanoindentation.

Keywords

Acknowledgement

이 연구는2024년도 정부(산업통상자원부)의 재원으로 한국산업기술진흥원의 지원을 받아 수행된 연구입니다. (P0023676, 2024년 산업혁신인재성장지원사업)

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