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Computational investigation of thermal behavior and molten metal flow with moving laser heat source for selective laser melting process
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Document Title
Computational investigation of thermal behavior and molten metal flow with moving laser heat source for selective laser melting process
Author
Ninpetch P., Kowitwarangkul P., Mahathanabodee S., Chalermkarnnon P., Rattanadecho P.
Name from Authors Collection
Scopus Author ID
6505842759
Affiliations
The Sirindhorn International Thai-German Graduate School of Engineering (TGGS), King Mongkut's University of Technology North Bangkok, 1518 Pracharat 1 Road, Wongsawang, Bangsue, Bangkok, 10800, Thailand; Department of Production Engineering, Faculty of Engineering, King Mongkut's University of Technology, Bangkok, North Bangkok, Thailand; Assistive Technology and Medical Devices Research Center, National Science and Technology Development Agency, Pathum Thani, Thailand; Department of Mechanical Engineering, Faculty of Engineering, Thammasat University (Rangsit Campus), Pathumthani, Thailand
Type
Article
Source Title
Case Studies in Thermal Engineering
ISSN
2214157X
Year
2021
Volume
24
Open Access
Gold
Publisher
Elsevier Ltd
DOI
10.1016/j.csite.2021.100860
Abstract
Selective laser melting (SLM) process, which is one type of additive manufacturing (AM) processes, involves numerous complex physical phenomena such as heat transfer, molten metal flow, phase transformation, and Marangoni effect. These phenomena have significant effect on the final products quality. The aims of this research are to investigate the thermal behavior and molten metal flow characteristics, and to analyze the influence of the process parameters on scanning track formation. An integrated numerical modelling of discrete element method (DEM) and computational fluid dynamics (CFD) are applied. The results reveal that the molten metal backward flowed from the laser hot spot to the rear of the melt pool due to the surface tension gradient. The uniform tear-drop shape and high penetration scanning track occurred with laser power and scanning speed of 200 W and 1000 mm/s, 250 W and 1000 mm/s, and 250 W and 1200 mm/s. Moreover, the scanning track width and depth of all scanning speed levels, 1000 mm/s, 1200 mm/s, and 1500 mm/s, increased around 4-10 μm and 14-22 μm, respectively, with the increase in laser power of 50 W and reduced around 1-4 μm and 3-6 μm, respectively, per increasing in scanning speed of 100 mm/s. © 2021 The Authors.
Industrial Classification
Knowledge Taxonomy Level 1
Knowledge Taxonomy Level 2
Knowledge Taxonomy Level 3
Funding Sponsor
National Science and Technology Development Agency; Thailand Graduate Institute of Science and Technology; King Mongkut's University of Technology North Bangkok; Thailand Science Research and Innovation
License
CC BY or CC BY-NC-ND
Rights
Elsevier B.V.
Publication Source
Scopus
Note
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