Laser Powder Bed Fusion of Water-Atomized Iron-Based Powders: Process Optimization
AbstractThe laser powder bed fusion (L-PBF) technology was adapted for use with non-spherical low-cost water-atomized iron powders. A simplified numerical and experimental modeling approach was applied to determine—in a first approximation—the operation window for the selected powder in terms of laser power, scanning speed, hatching space, and layer thickness. The operation window, delimited by a build rate ranging from 4 to 25 cm3/h, and a volumetric energy density ranging from 50 to 190 J/mm3, was subsequently optimized to improve the density, the mechanical properties, and the surface roughness of the manufactured specimens. Standard L-PBF-built specimens were subjected to microstructural (porosity, grain size) and metrological (accuracy, shrinkage, minimum wall thickness, surface roughness) analyses and mechanical testing (three-point bending and tensile tests). The results of the microstructural, metrological and mechanical characterizations of the L-PBF-built specimens subjected to stress relieve annealing and hot isostatic pressing were then compared with those obtained with conventional pressing-sintering technology. Finally, by using an energy density of 70 J/mm3 and a build rate of 9 cm3/h, it was possible to manufacture 99.8%-dense specimens with an ultimate strength of 330 MPa and an elongation to failure of 30%, despite the relatively poor circularity of the powder used. View Full-Text
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Letenneur, M.; Brailovski, V.; Kreitcberg, A.; Paserin, V.; Bailon-Poujol, I. Laser Powder Bed Fusion of Water-Atomized Iron-Based Powders: Process Optimization. J. Manuf. Mater. Process. 2017, 1, 23.
Letenneur M, Brailovski V, Kreitcberg A, Paserin V, Bailon-Poujol I. Laser Powder Bed Fusion of Water-Atomized Iron-Based Powders: Process Optimization. Journal of Manufacturing and Materials Processing. 2017; 1(2):23.Chicago/Turabian Style
Letenneur, Morgan; Brailovski, Vladimir; Kreitcberg, Alena; Paserin, Vladimir; Bailon-Poujol, Ian. 2017. "Laser Powder Bed Fusion of Water-Atomized Iron-Based Powders: Process Optimization." J. Manuf. Mater. Process. 1, no. 2: 23.
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