Abstract
In this study, the effect of powder spreading direction was investigated on selectively laser-melted specimens. The results showed that the metallurgical properties of the specimens varied during fabrication with respect to their position on the build tray. The density, porosity, and tensile properties of the Co–Cr–W–Mo alloy were investigated on cuboid and tensile specimens fabricated at different locations. Two different significant positions on the tray were selected along the powder spreading direction. One set of specimens was located near the start line of powder spreading, and the other set was located near the end of the building tray. The main role in the consequences of powder layering was played by the distribution of powder particle sizes and the packing density of the layers. As a result, laser penetration, melt pool formation, and fusion characteristics varied. To confirm the occurrence of variations in sample density, an additional experiment was performed with a Ti–6Al–4V alloy. Furthermore, the powders were collected at two different fabricating locations and their size distribution for both materials was investigated.
Highlights
Several studies have been carried out on the properties of products made with the powder bed additive manufacturing processes, in particular the selective laser melting (SLM) process [1,2,3]
The analyses of density, porosity, and tensile properties of the specimens produced indicate that the location of the specimens in relation to the spreading direction of the powder has a significant influence on SLM product quality
The authors have investigated and reported the occurrence of different densities, porosities, and tensile properties of the selectively laser-melted specimens fabricated at different locations on the build tray
Summary
Several studies have been carried out on the properties of products made with the powder bed additive manufacturing processes, in particular the selective laser melting (SLM) process [1,2,3]. These investigations were based on employing different processing parameters [4,5,6], scanning strategies [7], and different build-up directions due to different angular orientations of the part [8, 9]. The powder is spread by a raking mechanism utilizing the weight force of the powder accumulated by the re-coater over the intended powder layer. It may happen that the powder is unevenly distributed across the build tray from the starting
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