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Research on the Thermal Behaviour of a Selectively Laser Melted Aluminium Alloy: Simulation and Experiment

A 3D Finite Element (FE) model was developed to investigate the thermal behaviour within the melt pool during point exposure to Selective Laser Melting (SLM) processed AlSi10Mg powder. The powder–solid transition, temperature-dependent thermal properties, melt pool convection, and recoating phase we...

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Autores principales: Li, Zhonghua, Li, Bao-Qiang, Bai, Peikang, Liu, Bin, Wang, Yu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6073931/
https://www.ncbi.nlm.nih.gov/pubmed/29987242
http://dx.doi.org/10.3390/ma11071172
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author Li, Zhonghua
Li, Bao-Qiang
Bai, Peikang
Liu, Bin
Wang, Yu
author_facet Li, Zhonghua
Li, Bao-Qiang
Bai, Peikang
Liu, Bin
Wang, Yu
author_sort Li, Zhonghua
collection PubMed
description A 3D Finite Element (FE) model was developed to investigate the thermal behaviour within the melt pool during point exposure to Selective Laser Melting (SLM) processed AlSi10Mg powder. The powder–solid transition, temperature-dependent thermal properties, melt pool convection, and recoating phase were taken into account. The effects of Exposure Time (ET) and Point Distance (PD) on SLM thermal behaviour were also investigated and showed that the short liquid phase time and high cooling rate of the melt pool reduced the viscosity of the melt pool at a lower ET or a higher PD. This resulted in poor wettability and the occurrence of balling and micropores. At a higher ET or lower PD the melt pool became unstable and allowed for easy formation of the self-balling phenomenon, as well as further partial remelting in the depth direction resulting in the creation of larger pores. The proper melt pool width (119.8 μm) and depth (48.65 μm) were obtained for a successful SLM process using an ET of 140 μs and a PD of 80 μm. The surface morphologies and microstructures were experimentally obtained using the corresponding processing conditions, and the results aligned with those predicted in the simulation.
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spelling pubmed-60739312018-08-13 Research on the Thermal Behaviour of a Selectively Laser Melted Aluminium Alloy: Simulation and Experiment Li, Zhonghua Li, Bao-Qiang Bai, Peikang Liu, Bin Wang, Yu Materials (Basel) Article A 3D Finite Element (FE) model was developed to investigate the thermal behaviour within the melt pool during point exposure to Selective Laser Melting (SLM) processed AlSi10Mg powder. The powder–solid transition, temperature-dependent thermal properties, melt pool convection, and recoating phase were taken into account. The effects of Exposure Time (ET) and Point Distance (PD) on SLM thermal behaviour were also investigated and showed that the short liquid phase time and high cooling rate of the melt pool reduced the viscosity of the melt pool at a lower ET or a higher PD. This resulted in poor wettability and the occurrence of balling and micropores. At a higher ET or lower PD the melt pool became unstable and allowed for easy formation of the self-balling phenomenon, as well as further partial remelting in the depth direction resulting in the creation of larger pores. The proper melt pool width (119.8 μm) and depth (48.65 μm) were obtained for a successful SLM process using an ET of 140 μs and a PD of 80 μm. The surface morphologies and microstructures were experimentally obtained using the corresponding processing conditions, and the results aligned with those predicted in the simulation. MDPI 2018-07-09 /pmc/articles/PMC6073931/ /pubmed/29987242 http://dx.doi.org/10.3390/ma11071172 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Li, Zhonghua
Li, Bao-Qiang
Bai, Peikang
Liu, Bin
Wang, Yu
Research on the Thermal Behaviour of a Selectively Laser Melted Aluminium Alloy: Simulation and Experiment
title Research on the Thermal Behaviour of a Selectively Laser Melted Aluminium Alloy: Simulation and Experiment
title_full Research on the Thermal Behaviour of a Selectively Laser Melted Aluminium Alloy: Simulation and Experiment
title_fullStr Research on the Thermal Behaviour of a Selectively Laser Melted Aluminium Alloy: Simulation and Experiment
title_full_unstemmed Research on the Thermal Behaviour of a Selectively Laser Melted Aluminium Alloy: Simulation and Experiment
title_short Research on the Thermal Behaviour of a Selectively Laser Melted Aluminium Alloy: Simulation and Experiment
title_sort research on the thermal behaviour of a selectively laser melted aluminium alloy: simulation and experiment
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6073931/
https://www.ncbi.nlm.nih.gov/pubmed/29987242
http://dx.doi.org/10.3390/ma11071172
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