期刊
MATERIALS & DESIGN
卷 113, 期 -, 页码 369-376出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2016.10.031
关键词
Grain structure; Cellular Automata; Finite Element; Selective Laser Melting; Additive Manufacturing
资金
- EPSRC Centre for Innovative Manufacturing - Liquid Metal Engineering [EP/H026177/1]
- National Council of Science and Technology, Mexico (CONACyT)
- Engineering and Physical Sciences Research Council [EP/H026177/1] Funding Source: researchfish
- EPSRC [EP/H026177/1] Funding Source: UKRI
A two-dimensional Cellular Automata (CA) - Finite Element (FE) (CA-FE) coupled model has been developed to predict the microstructures formed during the laser melting of a powdered AA-2024 feedstock using the Additive Manufacturing (AM) process Selective Laser Melting (SLM). The presented CA model is coupled with a thermal FE model, which computes the heat flow characteristics of the SLM process. The developed model considers the powder-to-liquid-to-solid transformation, tracks the interaction between several melt pools within a melted track, and several tracks within various layers. It was found that the calculated temperature profiles as well as the simulated microstructures bared close resemblance with SLM fabricated AA-2024 samples. The developed model was capable of predicting melt pool cooling and solidification rates, the type of microstructure obtained, the size of the melt pool (with 14% error) and the heat affected zone, average grain size number (with 12% error) and the growth competition present in microstructures of components manufactured via SLM. (C) 2016 The Authors. Published by Elsevier Ltd.
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