열처리공학회지 (Journal of the Korean Society for Heat Treatment)

  • 제35권4호
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  • Pages.203-210
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  • 2022
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  • 1225-1070(pISSN)
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  • 2508-4046(eISSN)
한국열처리공학회 (The Korean Society for Heat Treatment)
권호 표지
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Selective laser melting 방식으로 제작된 Inconel 718 합금의 수소취성에 미치는 응고셀 조직의 영향에 관한 연구

A Study on the Effect of Solidification Substructure on the Hydrogen Embrittlement of Inconel 718 Fabricated by Selective Laser Melting

  • 이동현 (충남대학교 신소재공학과)
  • Lee, Dong-Hyun (Department of Materials Science and Engineering, Chungnam National University)
  • 투고 : 2022.07.08
  • 심사 : 2022.07.28
  • 발행 : 2022.07.30
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초록

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.

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과제정보

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

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