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논문 기본 정보

자료유형
학술저널
저자정보
Chanmi Kim (Changwon National University) Junho Park (Changwon National University) Yunkon Joo (Changwon National University) Byeongook Kong (Changwon National University) Hyun‑Uk Hong (Changwon National University) Jong‑Ho Shin (Doosan Heavy Industries and Construction Co. LTD.) Jehyun Lee (Changwon National University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.29 No.6
발행연도
2023.6
수록면
1,786 - 1,795 (10page)
DOI
10.1007/s12540-022-01322-5

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초록· 키워드

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The effects of the heat treatment and the specimen orientation relative to the building platform on the microstructural evolutionand mechanical properties were investigated in an IN718 alloy built by the selective laser melting process. The specimenswere built in the perpendicular and the parallel directions to the building platform. Optical microscope, scanning electronmicroscope, transmission electron microscope and electron backscatter diffraction analysis of the as-built specimen showeda melt pool boundary, a very fine cellular structure, the δ-phases at the melt pool boundary and in the intercellular regionregardless of the specimen orientation. After heat treatment, the melt pool boundary and the cell boundary were hardlyobserved, and the δ-phases were still observed at the melt pool boundary and the high-speed cell boundary. The γ′- and γ′′-phases precipitated during the aging heat treatment. The application of heat treatment improved hardness, yield strength andtensile strength, but reduced the ductility. To investigate the fracture mode, an iso-stress test was performed under constantstress and temperature. It was worthwhile to note that the crack in the vertically built specimen propagated through the meltpool boundary, and that in the horizontally built specimen propagated through the high-speed cell boundary. These boundarieswere arranged perpendicular to the tensile loading direction.

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