Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/154124
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dc.contributor.authorTan, Pengfeien_US
dc.contributor.authorKiran, Rajen_US
dc.contributor.authorZhou, Kunen_US
dc.date.accessioned2021-12-15T07:06:36Z-
dc.date.available2021-12-15T07:06:36Z-
dc.date.issued2021-
dc.identifier.citationTan, P., Kiran, R. & Zhou, K. (2021). Effects of sub-atmospheric pressure on keyhole dynamics and porosity in products fabricated by selective laser melting. Journal of Manufacturing Processes, 64, 816-827. https://dx.doi.org/10.1016/j.jmapro.2021.01.058en_US
dc.identifier.issn1526-6125en_US
dc.identifier.urihttps://hdl.handle.net/10356/154124-
dc.description.abstractA powder-scale multi-physics model is developed to investigate the keyhole dynamics and porosity in products fabricated by selective laser melting (SLM) under the sub-atmospheric pressure. The effects of the sub-atmospheric pressure on the plume attenuation of the laser beam, vaporization temperature and vapor recoil pressure are taken into account. The thermo-fluid behaviour in the melt pool under the atmospheric and sub-atmospheric ambient pressure is analysed in the SLM process. The simulation results suggest that the reduction of the sub-atmospheric pressure can increase the melt pool depth, whereas the effects are insignificant under the low sub-atmospheric pressure. As compared with the atmospheric pressure, the sub-atmospheric pressure leads to the decrease of the average temperature and the increase of the average recoil pressure on the keyhole surface, which is in favour of increasing keyhole stability and maintaining keyholes open. Consequently, the sub-atmospheric pressure can help to improve the keyhole stability and thus minimize pore defects in SLM-built products.en_US
dc.description.sponsorshipNational Research Foundation (NRF)en_US
dc.language.isoenen_US
dc.relation.ispartofJournal of Manufacturing Processesen_US
dc.rights© 2021 The Society of Manufacturing Engineers. All rights reserved. This paper was published by Elsevier Ltd.in Journal of Manufacturing Processes and is made available with permission of The Society of Manufacturing Engineers.en_US
dc.subjectEngineering::Mechanical engineeringen_US
dc.titleEffects of sub-atmospheric pressure on keyhole dynamics and porosity in products fabricated by selective laser meltingen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Mechanical and Aerospace Engineeringen_US
dc.contributor.researchSingapore Centre for 3D Printingen_US
dc.identifier.doi10.1016/j.jmapro.2021.01.058-
dc.description.versionAccepted versionen_US
dc.identifier.scopus2-s2.0-85101241711-
dc.identifier.volume64en_US
dc.identifier.spage816en_US
dc.identifier.epage827en_US
dc.subject.keywords3D Printingen_US
dc.subject.keywordsSelective Laser Meltingen_US
dc.description.acknowledgementThe authors would like to acknowledge the financial support from the National Research Foundation Medium Sized Center, Singapore through the Marine and Offshore Program.en_US
item.grantfulltextembargo_20230401-
item.fulltextWith Fulltext-
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