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...
| Main Authors: | , , , |
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| Format: | Journal Article |
| Language: | English |
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2020
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| Online Access: | https://hdl.handle.net/10356/143175 |
| _version_ | 1826127964705652736 |
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| author | Yu, Wenhui Sing, Swee Leong Chua, Chee Kai Tian, Xuelei |
| 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 |
| author_sort | Yu, Wenhui |
| collection | NTU |
| 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. |
| first_indexed | 2024-10-01T07:17:08Z |
| format | Journal Article |
| id | ntu-10356/143175 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:17:08Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-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 |
| 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 |
| title | 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_short | 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 |
| topic | Engineering::Mechanical engineering Selective Laser Melting Re-melting |
| url | https://hdl.handle.net/10356/143175 |
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