Selective laser melting (SLM) has received increasing attention in recent years as an innovative manufacturing technique. The present SLM process only uses a single laser beam to melt and consolidate the powder, which may result in excessive evaporation. In this paper, a double beam scanning strategy is investigated in which the first laser beam preheats the powder just below the sintering point while the second laser beam completely melts the powder. An analytical solution on the temperature distribution heated by a moving laser beam in the powder-bulk domain is derived and is used to determine the critical radius of the first laser beam. The single and double beam scanning strategies are compared numerically and it is found that double beam scanning can effectively reduce material evaporation and increase the amount of powder melted in the SLM process.
Analytical Solution of Temperature Distribution in a Nonuniform Medium Due to a Moving Laser Beam and a Double Beam Scanning Strategy in the Selective Laser Melting Process
Nanyang Technological University,
50 Nanyang Avenue,
Ocean and Civil Engineering (State Key
Laboratory of Ocean Engineering),
Shanghai Jiao Tong University,
Shanghai 200240, China
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received October 17, 2017; final manuscript received May 6, 2018; published online June 29, 2018. Assoc. Editor: Ali Khounsary.
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Loh, L., Song, J., Guo, F., and Bi, G. (June 29, 2018). "Analytical Solution of Temperature Distribution in a Nonuniform Medium Due to a Moving Laser Beam and a Double Beam Scanning Strategy in the Selective Laser Melting Process." ASME. J. Heat Transfer. August 2018; 140(8): 082302. https://doi.org/10.1115/1.4040256
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