Columnar-to-equiaxed transition in a laser scan for metal additive manufacturing
File(s)
Published version
Author(s)
Yuan, L
Sabau, AS
StJohn, D
Prasad, A
Lee, PD
Type
Conference Paper
Abstract
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.
Date Issued
2020-06-13
Date Acceptance
2020-06-01
Citation
IOP Conference Series: Materials Science and Engineering, 2020, 861, pp.1-8
Publisher
IOP Publishing
Start Page
1
End Page
8
Journal / Book Title
IOP Conference Series: Materials Science and Engineering
Volume
861
Copyright Statement
© 2020 The Author(s). 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.
License URL
Identifier
https://iopscience.iop.org/article/10.1088/1757-899X/861/1/012007
Source
MCWASP XV: International Conference on Modelling of Casting, Welding and Advanced Solidification Processes
Publication Status
Published
Start Date
2020-06-22
Finish Date
2020-06-23
Coverage Spatial
Jönköping, Sweden
Date Publish Online
2020-06-13