Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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A Study on the Effect of Solidification Substructure on the Hydrogen Embrittlement of Inconel 718 Fabricated by Selective Laser Melting

Selective laser melting 방식으로 제작된 Inconel 718 합금의 수소취성에 미치는 응고셀 조직의 영향에 관한 연구

  • Lee, Dong-Hyun (Department of Materials Science and Engineering, Chungnam National University)
  • 이동현 (충남대학교 신소재공학과)
  • Received : 2022.07.08
  • Accepted : 2022.07.28
  • Published : 2022.07.30
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Abstract

In this study, hydrogen embrittlement in Inconel 718 fabricated by selective laser melting (SLM) was investigated. To focus on the effect of the SLM-induced solidification substructure, hydrogen embrittlement behavior of SLM as-built (SLM-AB) sample and that of conventionally produced (Con-S) sample were systematically compared. The detailed microstructural characterization showed that the SLM-AB sample exhibited a solidification substructure including a high density of dislocations and Laves phase, while the Con-S sample showed completely recrystallized grains without any substructure. Although the intrinsic strength in the SLM-AB sample was higher than the Con-S sample, the resistance to hydrogen embrittlement was higher in the SLM-AB sample. Nevertheless, a statistical analysis of the hydrogen-assisted cracks (HACs) revealed that the predominant HAC type of SLM-AB and Con-S samples was similar, i.e., intergranular HAC. The difference in the resistance to hydrogen embrittlement between the SLM-AB and Con-S samples were discussed in terms of the relation between the microstructural feature and its effect on hydrogen accumulation.

Keywords

Acknowledgement

이 연구는 2022년도 정부(산업통상자원부)의 재원으로 한국산업기술진흥원의 지원을 받아 수행된 연구(P0002019, 2022년 산업전문인력역량강화사업)입니다.

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