A fundamental analysis of factors affecting chemical homogeneity in the laser powder bed fusion process
A fundamental analysis of factors affecting chemical homogeneity in the laser powder bed fusion process
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DOI：
10.1016/j.ijheatmasstransfer.2022.122985
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发表时间：
2022-05-07
影响因子：
5.2
通讯作者：
Smith, M. C.
中科院分区：
文献类型：
--
作者：
Flint, T. F.;Anderson, M. J.;Smith, M. C.
In this work a novel mathematical framework, that fully describes the fusion and vapourisation state transitions in multi-component systems, has been applied to assist in understanding the fundamental mechanisms of defect formation and chemical homogenisation in the laser powder bed fusion process (L-PBF). Specifically, the role of vapourisation and condensation of the multi-component metallic substrate is investigated to determine the importance of properly capturing the state transitions when understanding the substrate evolution. The framework is applied to a ternary metallic system; it is revealed that entrained vapour bubbles in chemically dissimilar flows promote greater homogenisation during the condensation and collapse of these bubbles when compared to non-condensing phases. It is further shown that as the laser power density is increased, there is a greater tendency for preferential element evaporation of the lighter elements; this preferential element evaporation is quantified numerically for the first time, and shown to be a non-linear function of power density. (C) 2022 The Author(s). Published by Elsevier Ltd.
