Formation of SS316L Single Tracks in Micro Selective Laser Melting: Surface, Geometry, and Defects
To fabricate complex parts with a fine resolution and smooth finish, micro selective laser melting (SLM) has been developed recently by combining three attributes: small laser beam spot, fine powder size, and thin layer thickness. This paper studies the effect of the micro-SLM process parameters on...
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| Format: | Article |
| Language: | English |
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Wiley
2019-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2019/9451406 |
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| author | Zhiheng Hu Balasubramanian Nagarajan Xu Song Rui Huang Wei Zhai Jun Wei |
| author_facet | Zhiheng Hu Balasubramanian Nagarajan Xu Song Rui Huang Wei Zhai Jun Wei |
| author_sort | Zhiheng Hu |
| collection | DOAJ |
| description | To fabricate complex parts with a fine resolution and smooth finish, micro selective laser melting (SLM) has been developed recently by combining three attributes: small laser beam spot, fine powder size, and thin layer thickness. This paper studies the effect of the micro-SLM process parameters on the single track formation of 316L stainless steel. The surface morphology, geometrical features, and defects have been analyzed in detail. The results highlight that laser power and scanning velocity have a significant effect on the formation of single tracks. The single tracks fabricated through micro-SLM with varying process parameters are classified into four types: no melting, discontinuous, continuous but unstable, and continuous tracks. Besides, the top surface of the tracks is observed with “double-crest” morphology, due to the high recoil pressure gradient generated by the extremely fine spot size. In addition, molten pool geometry (width, depth, and height) has been characterized to study the mode of the molten pool in micro-SLM. Finally, the occurrence of two typical defects within the tracks, keyhole pore and cavity at the edges, has been studied. |
| format | Article |
| id | doaj-art-b0075a9160d64847b1b986d6fecb9799 |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-b0075a9160d64847b1b986d6fecb97992025-02-03T01:06:44ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422019-01-01201910.1155/2019/94514069451406Formation of SS316L Single Tracks in Micro Selective Laser Melting: Surface, Geometry, and DefectsZhiheng Hu0Balasubramanian Nagarajan1Xu Song2Rui Huang3Wei Zhai4Jun Wei5Singapore Institute of Manufacturing Technology (SIMTech), Agency for Science, Technology and Research (A∗STAR), 73 Nanyang Drive, 637662, SingaporeSingapore Institute of Manufacturing Technology (SIMTech), Agency for Science, Technology and Research (A∗STAR), 73 Nanyang Drive, 637662, SingaporeSingapore Institute of Manufacturing Technology (SIMTech), Agency for Science, Technology and Research (A∗STAR), 73 Nanyang Drive, 637662, SingaporeSingapore Institute of Manufacturing Technology (SIMTech), Agency for Science, Technology and Research (A∗STAR), 73 Nanyang Drive, 637662, SingaporeSingapore Institute of Manufacturing Technology (SIMTech), Agency for Science, Technology and Research (A∗STAR), 73 Nanyang Drive, 637662, SingaporeSingapore Institute of Manufacturing Technology (SIMTech), Agency for Science, Technology and Research (A∗STAR), 73 Nanyang Drive, 637662, SingaporeTo fabricate complex parts with a fine resolution and smooth finish, micro selective laser melting (SLM) has been developed recently by combining three attributes: small laser beam spot, fine powder size, and thin layer thickness. This paper studies the effect of the micro-SLM process parameters on the single track formation of 316L stainless steel. The surface morphology, geometrical features, and defects have been analyzed in detail. The results highlight that laser power and scanning velocity have a significant effect on the formation of single tracks. The single tracks fabricated through micro-SLM with varying process parameters are classified into four types: no melting, discontinuous, continuous but unstable, and continuous tracks. Besides, the top surface of the tracks is observed with “double-crest” morphology, due to the high recoil pressure gradient generated by the extremely fine spot size. In addition, molten pool geometry (width, depth, and height) has been characterized to study the mode of the molten pool in micro-SLM. Finally, the occurrence of two typical defects within the tracks, keyhole pore and cavity at the edges, has been studied.http://dx.doi.org/10.1155/2019/9451406 |
| spellingShingle | Zhiheng Hu Balasubramanian Nagarajan Xu Song Rui Huang Wei Zhai Jun Wei Formation of SS316L Single Tracks in Micro Selective Laser Melting: Surface, Geometry, and Defects Advances in Materials Science and Engineering |
| title | Formation of SS316L Single Tracks in Micro Selective Laser Melting: Surface, Geometry, and Defects |
| title_full | Formation of SS316L Single Tracks in Micro Selective Laser Melting: Surface, Geometry, and Defects |
| title_fullStr | Formation of SS316L Single Tracks in Micro Selective Laser Melting: Surface, Geometry, and Defects |
| title_full_unstemmed | Formation of SS316L Single Tracks in Micro Selective Laser Melting: Surface, Geometry, and Defects |
| title_short | Formation of SS316L Single Tracks in Micro Selective Laser Melting: Surface, Geometry, and Defects |
| title_sort | formation of ss316l single tracks in micro selective laser melting surface geometry and defects |
| url | http://dx.doi.org/10.1155/2019/9451406 |
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