Multi-physics modelling of molten pool development and track formation in multi-track, multi-layer and multi-material selective laser meelting

被引:132
作者
Gu, Heng [1 ]
Wei, Chao [2 ]
Li, Lin [2 ]
Han, Quanquan [1 ]
Setchi, Rossitza [1 ]
Ryan, Michael [1 ]
Li, Qian [2 ]
机构
[1] Cardiff Univ, Cardiff Sch Engn, Cardiff CF24 3AA, Wales
[2] Univ Manchester, Sch Mech Aerosp & Civil Engn, Laser Proc Res Ctr, Manchester M13 9PL, Lancs, England
关键词
Selective laser melting (SLM); Multi-material; Heat transfer; Discrete element method (DEM); Computational fluid dynamics (CFD); Additive manufacturing; 316L STAINLESS-STEEL; SOLIDIFICATION MICROSTRUCTURE; INTERFACIAL CHARACTERIZATION; FLUID-DYNAMICS; POWDER LAYER; SLM PARTS; SIMULATION; COPPER; MECHANISMS; HEAT;
D O I
10.1016/j.ijheatmasstransfer.2020.119458
中图分类号
O414.1 [热力学];
学科分类号
摘要
Selective laser melting (SLM) is a promising powder-based additive manufacturing technology due to its capability to fabricate metallic components with complex geometries. While most previous investigations focus on printing with a single material, recent industry-orientated studies indicate the need for multi-material SLM in several high-value manufacturing sectors including medical devices, aerospace and automotive industries. However, understanding the underlying physics in multi-material SLM remains challenging due to the difficulties of experimental observation. In this paper, an integrated modelling framework for multi-track, multi-layer and multi-material SLM is developed to advance the in-depth understanding of this process. The main novelty is in modelling the molten pool evolvement and track morphology of multiple materials deposited on the same and across different layers. Discrete element method (DEM) is employed to reproduce the powder deposition process of multiple materials in different deposition patterns, with particle size distribution imported from a particle size analyser. Various phenomena including balling effect, keyhole depression, and lack of fusion between layers are investigated with different laser energy inputs. As a result of the different thermal properties, several process parameters including energy density and hatch spacing are optimised for different powder materials to obtain a continuous track profile and improved scanning efficiency. The interface between two layers of different materials is visualised by simulation; it was found that the phase migration at the interface is related to the convection flow inside the molten pool, which contributes to the mixing of the two materials and elemental diffusion. This study significantly contributes to the challenging area of multimaterial additive manufacturing by providing a greater in-depth understanding of the SLM process from multi-material powder deposition to laser interaction with powders across multiple scanning tracks and different building layers than can be achieved by experimentation alone. Crown Copyright (C) 2020 Published by Elsevier Ltd. All rights reserved.
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页数:16
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