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Title: Revealing hot tearing mechanism for an additively manufactured high-entropy alloy via selective laser melting
Authors: Sun, Zhongji
Tan, Xi Peng
Descoins, Marion
Mangelinck, Dominique
Tor, Shu Beng
Lim, Choon Seng
Keywords: Engineering::Materials
Issue Date: 2019
Source: Sun, Z., Tan, X. P., Descoins, M., Mangelinck, D., Tor, S. B., & Lim, C. S. (2019). Revealing hot tearing mechanism for an additively manufactured high-entropy alloy via selective laser melting. Scripta Materialia, 168, 129-133. doi:10.1016/j.scriptamat.2019.04.036
Journal: Scripta Materialia
Abstract: Hot tearing mechanisms of a high-entropy alloy CoCrFeNi additively manufactured by selective laser melting have been investigated. Intergranular hot cracks are present regardless of various parameters used, suggesting poor laser-based printability for the alloy. Elemental segregation does not exist at the grain boundary that favours the hot cracking. We find that severe residual stress induced by the large grain size is the root cause for the intergranular cracking. The classic Rappaz-Drezet-Gremaud model is used to predict the characteristic depression pressure limit beyond which hot tearing will occur for the selective laser melting of metals and alloys.
ISSN: 1359-6462
DOI: 10.1016/j.scriptamat.2019.04.036
Schools: School of Mechanical and Aerospace Engineering 
Research Centres: Singapore Centre for 3D Printing 
Rights: © 2019 Acta Materialia Inc. All rights reserved. This paper was published by Elsevier Ltd. in Scripta Materialia and is made available with permission of Acta Materialia Inc.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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