On the study of keyhole-mode melting in selective laser melting process

A physics-based computational fluid dynamics (CFD) model was developed to simulate selective laser melting (SLM) process. The heat source model imitates the multiple reflections of the laser beam by using the Fresnel absorption function. The model is able to simulate the fluid flow and heat transfer...

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Main Authors: Le, Kim Quy, Tang, Chao, Wong, Chee How
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/142073
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1420732021-02-01T09:01:21Z On the study of keyhole-mode melting in selective laser melting process Le, Kim Quy Tang, Chao Wong, Chee How School of Mechanical and Aerospace Engineering Singapore Centre for 3D Printing Engineering::Mechanical engineering Additive Manufacturing Selective Laser Melting A physics-based computational fluid dynamics (CFD) model was developed to simulate selective laser melting (SLM) process. The heat source model imitates the multiple reflections of the laser beam by using the Fresnel absorption function. The model is able to simulate the fluid flow and heat transfer of keyhole-mode laser melting process, which is validated by single track experiments. In addition, the simulation results show that the melt pool dynamics of the well-deep keyhole is unsteady as compared to the medium-deep keyhole. Different modes of fluid flow, such as downward flow, bottom backward flow, clockwise flow and top forward flow are noticed in the well-deep keyhole melt pool. On the other hand, the melt pool dynamics of the medium-deep keyhole is more stable with two main flows of downward flow and backward flow. Furthermore, the model brings the benefit of predicting the keyhole-induced porosity within the solidified track. Accepted version 2020-06-15T08:01:48Z 2020-06-15T08:01:48Z 2019 Journal Article Le, K. Q., Tang, C., & Wong, C. H. (2019). On the study of keyhole-mode melting in selective laser melting process. International Journal of Thermal Sciences, 145, 105992-. doi:10.1016/j.ijthermalsci.2019.105992 1290-0729 https://hdl.handle.net/10356/142073 10.1016/j.ijthermalsci.2019.105992 145 en International Journal of Thermal Sciences © 2019 Elsevier Masson SAS. All rights reserved. This paper was published in International Journal of Thermal Sciences and is made available with permission of Elsevier Masson SAS. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Mechanical engineering
Additive Manufacturing
Selective Laser Melting
spellingShingle Engineering::Mechanical engineering
Additive Manufacturing
Selective Laser Melting
Le, Kim Quy
Tang, Chao
Wong, Chee How
On the study of keyhole-mode melting in selective laser melting process
description A physics-based computational fluid dynamics (CFD) model was developed to simulate selective laser melting (SLM) process. The heat source model imitates the multiple reflections of the laser beam by using the Fresnel absorption function. The model is able to simulate the fluid flow and heat transfer of keyhole-mode laser melting process, which is validated by single track experiments. In addition, the simulation results show that the melt pool dynamics of the well-deep keyhole is unsteady as compared to the medium-deep keyhole. Different modes of fluid flow, such as downward flow, bottom backward flow, clockwise flow and top forward flow are noticed in the well-deep keyhole melt pool. On the other hand, the melt pool dynamics of the medium-deep keyhole is more stable with two main flows of downward flow and backward flow. Furthermore, the model brings the benefit of predicting the keyhole-induced porosity within the solidified track.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Le, Kim Quy
Tang, Chao
Wong, Chee How
format Article
author Le, Kim Quy
Tang, Chao
Wong, Chee How
author_sort Le, Kim Quy
title On the study of keyhole-mode melting in selective laser melting process
title_short On the study of keyhole-mode melting in selective laser melting process
title_full On the study of keyhole-mode melting in selective laser melting process
title_fullStr On the study of keyhole-mode melting in selective laser melting process
title_full_unstemmed On the study of keyhole-mode melting in selective laser melting process
title_sort on the study of keyhole-mode melting in selective laser melting process
publishDate 2020
url https://hdl.handle.net/10356/142073
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