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Research Papers: Melting and Solidification

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

[+] Author and Article Information
Loong-Ee Loh

School of Mechanical and
Aerospace Engineering,
Nanyang Technological University,
50 Nanyang Avenue,
Singapore 639798

Jie Song

Joining Technology Group,
Singapore Institute of
Manufacturing Technology,
73 Nanyang Drive,
Singapore 637662
e-mails: songj@simtech.a-star.edu.sg;
so0001ie@gmail.com

Fenglin Guo

School of Naval Architecture,
Ocean and Civil Engineering (State Key
Laboratory of Ocean Engineering),
Shanghai Jiao Tong University,
Shanghai 200240, China

Guijun Bi

Joining Technology Group,
Singapore Institute of
Manufacturing Technology,
73 Nanyang Drive,
Singapore 637662
e-mail: gjbi@simtech.a-star.edu.sg

1Corresponding author.

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.

J. Heat Transfer 140(8), 082302 (Jun 29, 2018) (6 pages) Paper No: HT-17-1614; doi: 10.1115/1.4040256 History: Received October 17, 2017; Revised May 06, 2018

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.

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Figures

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Fig. 1

Schematic of laser beam heating the powder layer lying above an underlying bulk (base plate)

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Fig. 2

Schematic of the double laser beam numerical modeling

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Fig. 3

Experimental and numerical results of SLM process with Aluminum alloy 6061 under laser power 150 W [7] (Reprinted with permission by Elsevier © 2015)

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Fig. 4

Maximum temperatures obtained numerically and analytically under (a) uniform and (b) Gaussian laser beam at different laser powers and its corresponding critical radius

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Fig. 5

Percentages of (a) evaporation reduction and (b) melt increment under different laser power (q1), laser beam distribution, and distance apart

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