Revealing hot tearing mechanism for an additively manufactured high-entropy alloy via selective laser melting

Revealing hot tearing mechanism for an additively manufactured high-entropy alloy via selective laser melting

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...

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Bibliographic Details
Main Authors: Sun, Zhongji, Tan, Xi Peng, Descoins, Marion, Mangelinck, Dominique, Tor, Shu Beng, Lim, Choon Seng
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2020
Subjects:
Engineering::Materials
Additive Manufacturing
High-entropy Alloy
Online Access:https://hdl.handle.net/10356/143122
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Institution: Nanyang Technological University
Language: English
Description
Summary: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.

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