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- W4377019181 abstract "Abstract Laser powder bed fusion (LPBF) is an extensively used additive manufacturing process that can build metal parts with complicated geometric designs. However, because of the rapid solidification conditions and the layer-by-layer building, its application is challenged by products having poor surface quality and reduced mechanical properties. The laser rescanning process is often used as a refinement method during LPBF to improve the quality of products. In this study, grain structure formation during the LPBF laser rescanning process is modelled by a 3D cellular automaton based microstructure model coupled with finite element analysis. The coupled model considers different nucleation mechanisms, including epitaxial growth, which are applicable to rapid solidification in melt pool. The model is adapted to reproduce the grain structure and evolution of an Al-Si alloy manufactured by LPBF utilizing a laser rescanning strategy. The effects of laser remelting on the characteristics of the grain structure (i.e., the grain size, aspect ratio and orientation) are evaluated. The mechanisms that enable unique grain structure (i.e., grain refinement) are discussed." @default.
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- W4377019181 date "2023-05-01" @default.
- W4377019181 modified "2023-09-26" @default.
- W4377019181 title "A 3D simulation of grain structure evolution during laser rescanning process of powder bed fusion additive manufacturing" @default.
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- W4377019181 doi "https://doi.org/10.1088/1757-899x/1281/1/012009" @default.
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