A computational study on porosity evolution in parts produced by selective laser melting

Selective laser melting (SLM) is a powder-bed additive manufacturing process that uses laser to melt powders, layer by layer to generate a functional 3D part. There are many different parameters, such as laser power, scanning speed, and layer thickness, which play a role in determining the quality o...

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Main Authors: Tan, Jie Lun, Tang, Chao, Wong, Chee How
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2019
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Online Access:https://hdl.handle.net/10356/102487
http://hdl.handle.net/10220/47679
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1024872021-08-16T00:27:40Z A computational study on porosity evolution in parts produced by selective laser melting Tan, Jie Lun Tang, Chao Wong, Chee How School of Mechanical and Aerospace Engineering Singapore Centre for 3D Printing Engineering::Materials Modelling Selective Laser Melting Selective laser melting (SLM) is a powder-bed additive manufacturing process that uses laser to melt powders, layer by layer to generate a functional 3D part. There are many different parameters, such as laser power, scanning speed, and layer thickness, which play a role in determining the quality of the printed part. These parameters contribute to the energy density applied on the powder bed. Defects arise when insufficient or excess energy density is applied. A common defect in these cases is the presence of porosity. This paper studies the formation of porosities when inappropriate energy densities are used. A computational model was developed to simulate the melting and solidification process of SS316L powders in the SLM process. Three different sets of process parameters were used to produce 800-µm-long melt tracks, and the characteristics of the porosities were analyzed. It was found that when low energy density parameters were used, the pores were found to be irregular in shapes and were located near the top surface of the powder bed. However, when high energy density parameters were used, the pores were either elliptical or spherical in shapes and were usually located near the bottom of the keyholes. Accepted version 2019-02-15T06:09:27Z 2019-12-06T20:55:42Z 2019-02-15T06:09:27Z 2019-12-06T20:55:42Z 2018 Journal Article Tan, J. L., Tang, C. & Wong, C. H. (2018). A computational study on porosity evolution in parts produced by selective laser melting. Metallurgical and Materials Transactions A. https://dx.doi.org/10.1007/s11661-018-4697-x 1073-5623 https://hdl.handle.net/10356/102487 http://hdl.handle.net/10220/47679 10.1007/s11661-018-4697-x en Metallurgical and Materials Transactions A Metallurgical and Materials Transactions A © 2018 The Minerals, Metals & Materials Society and ASM International. All rights reserved. This paper was published by Springer in Metallurgical and Materials Transactions A and is made available with permission of The Minerals, Metals & Materials Society and ASM International. 29 p. 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::Materials
Modelling
Selective Laser Melting
spellingShingle Engineering::Materials
Modelling
Selective Laser Melting
Tan, Jie Lun
Tang, Chao
Wong, Chee How
A computational study on porosity evolution in parts produced by selective laser melting
description Selective laser melting (SLM) is a powder-bed additive manufacturing process that uses laser to melt powders, layer by layer to generate a functional 3D part. There are many different parameters, such as laser power, scanning speed, and layer thickness, which play a role in determining the quality of the printed part. These parameters contribute to the energy density applied on the powder bed. Defects arise when insufficient or excess energy density is applied. A common defect in these cases is the presence of porosity. This paper studies the formation of porosities when inappropriate energy densities are used. A computational model was developed to simulate the melting and solidification process of SS316L powders in the SLM process. Three different sets of process parameters were used to produce 800-µm-long melt tracks, and the characteristics of the porosities were analyzed. It was found that when low energy density parameters were used, the pores were found to be irregular in shapes and were located near the top surface of the powder bed. However, when high energy density parameters were used, the pores were either elliptical or spherical in shapes and were usually located near the bottom of the keyholes.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Tan, Jie Lun
Tang, Chao
Wong, Chee How
format Article
author Tan, Jie Lun
Tang, Chao
Wong, Chee How
author_sort Tan, Jie Lun
title A computational study on porosity evolution in parts produced by selective laser melting
title_short A computational study on porosity evolution in parts produced by selective laser melting
title_full A computational study on porosity evolution in parts produced by selective laser melting
title_fullStr A computational study on porosity evolution in parts produced by selective laser melting
title_full_unstemmed A computational study on porosity evolution in parts produced by selective laser melting
title_sort computational study on porosity evolution in parts produced by selective laser melting
publishDate 2019
url https://hdl.handle.net/10356/102487
http://hdl.handle.net/10220/47679
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