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논문 기본 정보

자료유형
학술저널
저자정보
Seulbi Lee (Pusan National University) Jaewoong Kim (Pusan National University) Do‑Sik Shim (Korea Maritime and Ocean University) 박상후 (부산대학교) 최윤석 (부산대학교)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.26 No.5
발행연도
2020.1
수록면
708 - 718 (11page)

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초록· 키워드

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Single track and multi-layers of medium-carbon steel (AISI H13) powders were additively deposited on gray cast ironusing a directed energy deposition (DED) technique. Multi-scale microstructure characterization using a scanning electronmicroscopy, an electron probe micro-analyzer and a scanning transmission electron microscopy, and the thermal analysisusing finite element method were performed to understand the mechanism for the micro-crack formation, which was foundat the single, double and triple layers of medium-carbon steel powders, except for the single track, deposited on a cast ironsubstrate. The crack formation mechanism was thoroughly investigated by combining the layer-by-layer chemistry variationsand the resulting microstructural evolution upon exposure to thermal cycles during the DED process. It was concluded thatmicro-cracking was accompanied by the initiation of the local graphitization and the formation of plate martensite in thevicinity, which seemed to be kinetically facilitated by an indirect exposure to multiple heating–cooling thermal cycles, notby a direct exposure to a melting-cooling (solidification) cycle.

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