基于激光的金属粉末床熔融过程中的微观结构演变

Venkata K Nadimpalli, Tianbo Yu
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引用次数: 0

摘要

基于激光的金属粉末床熔融(LPBF)为逐个体素创建微观结构提供了独特的可能性。每个方向的最小体素尺寸取决于材料配料精度和激光加工参数。LPBF 过程中的快速凝固条件会导致材料的异质性以及分层和非平衡微结构。本文深入探讨了目前用于控制 LPBF 中微观结构的两种不同途径,即:通过材料分布进行原位微观结构控制,以形成具有复杂界面的功能分级组件;应用后处理热机械处理来控制微观结构。与传统制造方法不同的是,LPBF 中的每个体素在第一道融合工序后都可以进行多次进一步加工。这种原位加工为定制每个三维体素的微观结构提供了更多机会。因此,我们可以从未来的角度来看待在金属中控制和设计 LPBF 微结构的机会。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Microstructure evolution in laser-based powder bed fusion of metals
Laser-based powder bed fusion (LPBF) of metals offers the unique possibility of creating the microstructure voxel-by-voxel. The minimum voxel size in each direction is dependent on material dosing accuracy coupled with laser processing parameters. The rapid solidification conditions during LPBF lead to material heterogeneity coupled with hierarchical and non-equilibrium microstructures. The current paper delves into two different pathways available currently to control microstructure in LPBF, namely: in-situ microstructure control through material distribution to form functionally graded components with complex interfaces; application of post-processing thermo-mechanical treatments to control the microstructure. Unlike traditional manufacturing methods, each voxel in LPBF can be further processed multiple times after the first fusion process. Such in-situ processing presents further opportunity for tailoring the microstructure of each voxel in 3D. A future perspective is thus offered on the opportunities to control and engineer LPBF microstructures in metals.
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