Journal
JOURNAL OF MANUFACTURING PROCESSES
Volume 26, Issue -, Pages 280-289Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jmapro.2017.02.009
Keywords
Selective laser melting; Point exposure; Heat transfer; Fluid flow; Simulation
Categories
Funding
- National Natural Science Foundation of China [51405467]
- Chongqing Research of Application Foundation and Advanced Technology [cstc2016jcyj A0008, cstc2016jcyjA0059]
- Key Programs of the Chinese Academy of Sciences [KGZD-EW-T0]
- State Key Lab of Advanced Welding and Joining, Harbin Institute of Technology [AMJ-M16-03]
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Numerical simulation of heat transfer and fluid flow during selective laser melting (SLM) under point exposure scan of AlSi10Mg powder is performed. The influence of exposure time and point distance on temperature field, velocity field, liquidus duration and dimension of molten pool is investigated. The results show that exposure time has negligible effect on heat transfer and fluid flow and it leads to little change of the dimension of molten pool. With the increase of point distance, the simulated temperature and dimension of molten pool increases. Moreover, the duration of liquidus molten pool changes little with exposure time and point distance. For verifying the accuracy of simulated results, experiments are performed. Compared the dimension of molten pool in simulated results with experimental ones, good agreement is obtained. In addition, when the combination of exposure time and point distance is optimized at 140 mu s and 130 mu m, a pretty dense and smooth surface free of apparent pores, cracks and balling effect could be acquired. Meanwhile, both the maximum density and microhardness are obtained. (C) 2017 The Society of Manufacturing Engineers. Published by Elsevier Ltd. All rights reserved.
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