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Analytical solution of temperature distribution in a non-uniform 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, Singapore
deniselle_@hotmail.com

JIe Song

Joining Technology Group, Singapore Institute of Manufacturing Technology, 73 Nanyang Drive, Singapore 637662
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
flguo@sjtu.edu.cn

Guijun Bi

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

1Corresponding author.

ASME doi:10.1115/1.4040256 History: Received October 17, 2017; Revised May 06, 2018

Abstract

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 pre-heats 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.

Copyright (c) 2018 by ASME
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