Influence of re-melting on surface roughness and porosity of AlSi10Mg parts fabricated by selective laser melting

Re-melting strategies with same and opposite directions to the first scanning routine were performed in AlSi10Mg parts by selective laser melting (SLM) technology. Surface roughness and porosity were investigated with confocal microscopy, micro-computed tomography (CT) and optical microscopy (OM). R...

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Main Authors: Yu, Wenhui, Sing, Swee Leong, Chua, Chee Kai, Tian, Xuelei
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/143175
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1431752023-03-04T17:22:04Z Influence of re-melting on surface roughness and porosity of AlSi10Mg parts fabricated by selective laser melting Yu, Wenhui Sing, Swee Leong Chua, Chee Kai Tian, Xuelei School of Mechanical and Aerospace Engineering Singapore Centre for 3D Printing Engineering::Mechanical engineering Selective Laser Melting Re-melting Re-melting strategies with same and opposite directions to the first scanning routine were performed in AlSi10Mg parts by selective laser melting (SLM) technology. Surface roughness and porosity were investigated with confocal microscopy, micro-computed tomography (CT) and optical microscopy (OM). Re-melting facilitates the top surface finish with Ra value decreasing from 20.67 μm to 11.67 μm (same direction) and 10.87 μm (opposite direction), almost at the same level. On side surface there is a contradictory trend. Pores at SLM parts include spherical pores due to entrapped gases, irregular pores for lack of fusion, and keyhole pores because of laser movement. The former two kinds form in the central areas while the latter one is located at edges of melting tracks and exhibits different distribution at both sides. Re-melting allows more chances for pores (spherical and keyhole pores) to escape from the melting pools. Irregular pores decrease because smoother surface allows powders to be fully melted. Porosity decrease of both re-melting strategies in central areas of the SLM parts is almost on the same level while same directional re-melting exhibits superior ability to release porosity at edges because of the porosity distribution difference at the head and wake of the melting tracks. National Research Foundation (NRF) Accepted version This research is supported by National Natural Science Foundation of China (Project No. 51371109) and National Research Foundation, Prime Minister's Office, Singapore under its Medium-Sized Centre funding scheme. Wenhui Yu appreciates the sponsorship from China Scholarship Council (Sponsorship No.201706220205). 2020-08-11T01:52:01Z 2020-08-11T01:52:01Z 2019 Journal Article Yu, W., Sing, S. L., Chua, C. K., & Tian, X. (2019). Influence of re-melting on surface roughness and porosity of AlSi10Mg parts fabricated by selective laser melting. Journal of Alloys and Compounds, 792, 574-581. doi:10.1016/j.jallcom.2019.04.017 0925-8388 https://hdl.handle.net/10356/143175 10.1016/j.jallcom.2019.04.017 2-s2.0-85064093994 792 574 581 en Journal of Alloys and Compounds © 2019 Elsevier B.V. All rights reserved. This paper was published in Journal of Alloys and Compounds and is made available with permission of Elsevier B.V. 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
Selective Laser Melting
Re-melting
spellingShingle Engineering::Mechanical engineering
Selective Laser Melting
Re-melting
Yu, Wenhui
Sing, Swee Leong
Chua, Chee Kai
Tian, Xuelei
Influence of re-melting on surface roughness and porosity of AlSi10Mg parts fabricated by selective laser melting
description Re-melting strategies with same and opposite directions to the first scanning routine were performed in AlSi10Mg parts by selective laser melting (SLM) technology. Surface roughness and porosity were investigated with confocal microscopy, micro-computed tomography (CT) and optical microscopy (OM). Re-melting facilitates the top surface finish with Ra value decreasing from 20.67 μm to 11.67 μm (same direction) and 10.87 μm (opposite direction), almost at the same level. On side surface there is a contradictory trend. Pores at SLM parts include spherical pores due to entrapped gases, irregular pores for lack of fusion, and keyhole pores because of laser movement. The former two kinds form in the central areas while the latter one is located at edges of melting tracks and exhibits different distribution at both sides. Re-melting allows more chances for pores (spherical and keyhole pores) to escape from the melting pools. Irregular pores decrease because smoother surface allows powders to be fully melted. Porosity decrease of both re-melting strategies in central areas of the SLM parts is almost on the same level while same directional re-melting exhibits superior ability to release porosity at edges because of the porosity distribution difference at the head and wake of the melting tracks.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Yu, Wenhui
Sing, Swee Leong
Chua, Chee Kai
Tian, Xuelei
format Article
author Yu, Wenhui
Sing, Swee Leong
Chua, Chee Kai
Tian, Xuelei
author_sort Yu, Wenhui
title Influence of re-melting on surface roughness and porosity of AlSi10Mg parts fabricated by selective laser melting
title_short Influence of re-melting on surface roughness and porosity of AlSi10Mg parts fabricated by selective laser melting
title_full Influence of re-melting on surface roughness and porosity of AlSi10Mg parts fabricated by selective laser melting
title_fullStr Influence of re-melting on surface roughness and porosity of AlSi10Mg parts fabricated by selective laser melting
title_full_unstemmed Influence of re-melting on surface roughness and porosity of AlSi10Mg parts fabricated by selective laser melting
title_sort influence of re-melting on surface roughness and porosity of alsi10mg parts fabricated by selective laser melting
publishDate 2020
url https://hdl.handle.net/10356/143175
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