Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/154124
Title: Effects of sub-atmospheric pressure on keyhole dynamics and porosity in products fabricated by selective laser melting
Authors: Tan, Pengfei
Kiran, Raj
Zhou, Kun
Keywords: Engineering::Mechanical engineering
Issue Date: 2021
Source: Tan, 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.2021.01.058
Journal: Journal of Manufacturing Processes 
Abstract: A 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.
URI: https://hdl.handle.net/10356/154124
ISSN: 1526-6125
DOI: 10.1016/j.jmapro.2021.01.058
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.
Fulltext Permission: embargo_20230401
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles
SC3DP Journal Articles

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