The effects of locations on the build tray on the quality of specimens in powder bed additive manufacturing

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.

3D Printing Optimization for Environmental Sustainability: Experimenting with Materials of Protective Face Shield Frames

“… Infill density [%]: Infill provides internal support for top layers, which would otherwise have to bridge over the empty space. Most products can be printed with 10-15% infill [ 48 ]. Nozzle temperature [°C]: Temperature for melting filament.…”

Selective laser melting of CoCrMo: an evaluation of part density distribution across the build plate

“…During the powder layer deposition, the weight force of the powder decreases above the current powder layer as the recoater arm moves along the build platform. As this weight force decreases, the powder layer being deposited may be unevenly distributed across the build platform resulting in different packing efficiencies [9]. Moreover, when deciding on a layer thickness to be used, the upper threshold of the powder's particle size distribution (PSD) should be considered.…”

“…The PBD distribution was measured across the build platform and showed that the PBD increased as the distance from the powder supply chamber increased. In terms of part density distribution across the build platform, Pal et al [9] analysed the density, porosity and tensile properties of specimens produced at different build plate locations. Part densities of specimens manufactured nearest to the powder supply chamber were higher than those of the specimens manufactured nearest to the overflow chamber.…”

Metallurgical and Geometric Properties Controlling of Additively Manufactured Products using Artificial Intelligence

“…The emerging field of multidisciplinary for design, simulation, and manufacturing optimization is providing technologies that are changing the way designers design [9]. In the medical, aerospace, and automotive fields, the design community is showing great interest in manufacturing many components using AM technology [10,11]. This article has addressed the integration of design and manufacturing problems.…”