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Columnar-to-equiaxed transition in a laser scan for metal additive manufacturing

Yuan, L; Sabau, AS; Stjohn, D; Prasad, A; Lee, PD; (2020) Columnar-to-equiaxed transition in a laser scan for metal additive manufacturing. In: IOP Conference Series: Materials Science and Engineering,. IOP: Jönköping, Sweden. Green open access

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Abstract

© Published under licence by IOP Publishing Ltd. In laser powder bed fusion additive manufacturing (LPBFAM), different solidification conditions, e.g., thermal gradient and cooling rate, can be achieved by controlling the process parameters, such as laser power and laser speed. Tailoring the behaviour of the columnar to equiaxed transition (CET) of the printed alloy during fabrication can facilitate the production of highly customized microstructures. In this study, effective analytical solutions for both thermal conduction and solidification are employed to model solidifying melt pools. Microstructure textures and solidification conditions are evaluated for numerous combinations of laser power and laser speed under bead-on-plate conditions. This analytical-based high-throughput tool was demonstrated to select specific process parameters that lead to desired microstructures. Two selected process conditions were examined in detail by a highly parallelized microstructural solidification model to reveal both nucleation and grain growth. Both numerical solutions agree well with experiments that are performed based on bead-on-plate conditions, indicating that these numerical models aid evaluation of the nucleation parameters, providing insights for controlling CET during the LPBFAM processing.

Type: Proceedings paper
Title: Columnar-to-equiaxed transition in a laser scan for metal additive manufacturing
Event: MCWASP XV: International Conference on Modelling of Casting, Welding and Advanced Solidification Processes
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/1757-899X/861/1/012007
Publisher version: https://doi.org/10.1088/1757-899X/861/1/012007
Language: English
Additional information: Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Published under licence by IOP Publishing Ltd. For more information see: https://creativecommons.org/licenses/by/3.0/
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10104323
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