首页|Analysis of solidification microstructure and cracking mechanism of a matrix high-speed steel deposited using directed-energy deposition
Analysis of solidification microstructure and cracking mechanism of a matrix high-speed steel deposited using directed-energy deposition
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NSTL
Elsevier
? 2022 Elsevier B.V.This study investigated the microstructure and cracking mechanism of a matrix high-speed steel fabricated by direct energy deposition. The combined effect of rapid solidification and chemical composition on microstructure and cracking mechanism during deposition were investigated. Excessive solute segregation into inter-dendritic regions due to rapid solidification caused formation of retained austenite in the inter-dendritic region and formation of α'-martensite in the dendritic region. The excess solute segregation decreased equilibrium solidification temperature and caused formation of low-melting eutectic carbides in the inter-dendritic region. These carbides increased hot-cracking susceptibility, and caused solidification cracking and liquation cracking in the inter-dendritic region. In contrast, tensile residual stress in deposited layers may have caused cold cracking in α'-martensite near the hot crack tips. Cold cracks contributed to growth of macroscopic longitudinal cracks throughout the specimen by bridging the hot cracks formed during solidification or reheating.
Additive manufacturingCrack formation mechanismDirected energy depositionMatrix high-speed steelMicrostructure
Park G.-W.、Park S.S.、Shin S.、Kim J.-Y.、Koo Y.-M.、Lee W.、Lee K.-A.、Jeon J.B.
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Department of Materials Science and Engineering Ulsan National Institute of Science and Technology
Advanced Forming Process R&D Group Korea Institute of Industrial Technology
R&D Center Fusion Technology Co. Ltd
Powder Division Changsung Corp
School of Material Science and Engineering Pusan National University
Department of Materials Science and Engineering Inha University
Department of Materials Science and Engineering Dong-A University
NSTL
Elsevier
