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

By Zhongji Sun, X. Tan, M. Descoins, D. Mangelinck, Shu Beng Tor, C. S. Lim. Scripta Materialia, 2019

153 citations recorded by the source corpus.

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.

Subfields: Aerospace Engineering, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/9a40026a3d30abc05ddb0240659f8d778dda80b8

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In Aerospace Engineering

1. Swee Leong Sing
2. W. Y. Yeong

In Mechanical Engineering

1. W. Y. Yeong
2. Swee Leong Sing

Citations in the corpus

• Laser powder bed fusion for metal additive manufacturing: perspectives on recent developments (2020, background): “Hot tearing is also observed inCoCrFeNi regardlessof the variousprocessparameters used, suggesting poor printability of this material by L-PBF (Sun et al. 2019).”