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dc.contributor.authorYao, Limingen_US
dc.contributor.authorHuang, Shengen_US
dc.contributor.authorRamamurty, Upadrastaen_US
dc.contributor.authorXiao, Zhongminen_US
dc.identifier.citationYao, L., Huang, S., Ramamurty, U. & Xiao, Z. (2021). On the formation of “Fish-scale” morphology with curved grain interfacial microstructures during selective laser melting of dissimilar alloys. Acta Materialia, 220, 117331-.
dc.description.abstractFor successful fabrication of components using additive manufacturing techniques such as powder bed fusion (PBF), directed energy deposition, and laser cladding of an alloy on to a substrate of a dissimilar one, an interpenetrating interface morphology is essential for a good interface strength. The physical mechanisms behind the formation of different solidified interface morphologies after single track laser PBF of Inconel 718 powders on to the 316L austenitic stainless stress substrate were investigated by recourse to numerical simulations, which combine micron-scale fluid dynamics and solidification protocols with nanosecond-level thermal diffusion processes. These were complemented with parametric experiments to verify the simulations. Results show that an interface with the “fish scale” morphology can occur under certain combinations of process parameters, and because of the combined actions of recoil pressure, Marangoni forces, surface tension and melt pool shape. Three distinct morphologies that depend on the melt pool width and depth are identified and the interfacial areas for each of them are computed. The influence of the processing conditions that not only dictate the geometric parameters of the melt pool but also the degree of alloying and the resulting grain morphology within the interface microstructure were elucidated.en_US
dc.description.sponsorshipAgency for Science, Technology and Research (A*STAR)en_US
dc.relation.ispartofActa Materialiaen_US
dc.rights© 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.en_US
dc.subjectEngineering::Mechanical engineeringen_US
dc.titleOn the formation of “Fish-scale” morphology with curved grain interfacial microstructures during selective laser melting of dissimilar alloysen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Mechanical and Aerospace Engineeringen_US
dc.contributor.organizationInstitute of Materials Research and Engineering, A*STARen_US
dc.subject.keywordsAdditive Manufacturingen_US
dc.subject.keywordsLaser Depositionen_US
dc.description.acknowledgementFunding for this work was provided by A∗STAR SERC AME Programmatic Fund for the “Structural Metal Alloys Programme” (A18B1b0061).en_US
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