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Material characterization, thermal analysis, and mechanical performance of a laser-polished Ti alloy prepared by selective laser melting

Material characterization, thermal analysis, and mechanical performance of a laser-polished Ti alloy prepared by selective laser melting
Material characterization, thermal analysis, and mechanical performance of a laser-polished Ti alloy prepared by selective laser melting
The laser polishing technique offers an adaptable, accurate, and environmentally friendly solution to enhance the surface quality of additive manufactured metallic components. Recent work has shown that the surface roughness of laser additive manufactured metallic alloys can be significantly reduced via the laser polishing method. This paper examines the mechanical performances of a laser polished surface fabricated by selective laser melting (SLM). Compared with the original SLM surface, systematic measurements revealed that the surface roughness of the laser polished surface can be effectively reduced from 6.53 μm to 0.32 μm, while the microhardness and wear resistance increased by 25% and 39%, respectively. Through a thermal history analysis of the laser polishing process using the finite element model, new martensitic phase formation in the laser polished layer is carefully explained, which reveals significant effects on residual stress, strength, and fatigue. These findings establish foundational data to predict the mechanical performance of laser polished metallic components fabricated by additive manufacturing methods, and pave the way for functional surface design with practical application via the laser process.
laser polishing, additive manufacturing, selective laser melting, thermal kinetics, mechanical properties
2075-4701
1-11
Li, Yu-hang
66cc275f-bde9-4da4-aa4e-a1936189351e
Wang, Bing
8412bb47-9857-48d5-a3c4-858052f562bc
Ma, Cheng-peng
4504aa04-6e3b-4237-9bd1-c4585c164c0d
Fang, Zhi-hao
0833004d-2d98-46b1-9f51-dca5a88e69f4
Chen, Long-fei
64337dff-11bd-4526-abd2-33b93f331c3d
Guan, Ying-chun
e3645e7b-126f-47c6-9c15-299b533e54af
Yang, Shoufeng
e0018adf-8123-4a54-b8dd-306c10ca48f1
Li, Yu-hang
66cc275f-bde9-4da4-aa4e-a1936189351e
Wang, Bing
8412bb47-9857-48d5-a3c4-858052f562bc
Ma, Cheng-peng
4504aa04-6e3b-4237-9bd1-c4585c164c0d
Fang, Zhi-hao
0833004d-2d98-46b1-9f51-dca5a88e69f4
Chen, Long-fei
64337dff-11bd-4526-abd2-33b93f331c3d
Guan, Ying-chun
e3645e7b-126f-47c6-9c15-299b533e54af
Yang, Shoufeng
e0018adf-8123-4a54-b8dd-306c10ca48f1

Li, Yu-hang, Wang, Bing, Ma, Cheng-peng, Fang, Zhi-hao, Chen, Long-fei, Guan, Ying-chun and Yang, Shoufeng (2019) Material characterization, thermal analysis, and mechanical performance of a laser-polished Ti alloy prepared by selective laser melting. Metals, 9 (2), 1-11. (doi:10.3390/met9020112).

Record type: Article

Abstract

The laser polishing technique offers an adaptable, accurate, and environmentally friendly solution to enhance the surface quality of additive manufactured metallic components. Recent work has shown that the surface roughness of laser additive manufactured metallic alloys can be significantly reduced via the laser polishing method. This paper examines the mechanical performances of a laser polished surface fabricated by selective laser melting (SLM). Compared with the original SLM surface, systematic measurements revealed that the surface roughness of the laser polished surface can be effectively reduced from 6.53 μm to 0.32 μm, while the microhardness and wear resistance increased by 25% and 39%, respectively. Through a thermal history analysis of the laser polishing process using the finite element model, new martensitic phase formation in the laser polished layer is carefully explained, which reveals significant effects on residual stress, strength, and fatigue. These findings establish foundational data to predict the mechanical performance of laser polished metallic components fabricated by additive manufacturing methods, and pave the way for functional surface design with practical application via the laser process.

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metals-09-00112-v2 - Version of Record
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Accepted/In Press date: 19 January 2019
Published date: 22 January 2019
Keywords: laser polishing, additive manufacturing, selective laser melting, thermal kinetics, mechanical properties

Identifiers

Local EPrints ID: 435636
URI: http://eprints.soton.ac.uk/id/eprint/435636
ISSN: 2075-4701
PURE UUID: 8bff56f7-ee52-4975-bd20-03a602a4e0d4
ORCID for Shoufeng Yang: ORCID iD orcid.org/0000-0002-3888-3211

Catalogue record

Date deposited: 15 Nov 2019 17:30
Last modified: 18 Feb 2021 17:15

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