Francesco Gaetano Esposito
On the correlation between the Laser Powder Bed Fusion process parameters and residual stress in the AISI 316L stainless steel.
Rel. Luca Iuliano, Abdollah Saboori. Politecnico di Torino, Corso di laurea magistrale in Ingegneria Gestionale, 2022
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Abstract
Additive manufacturing is an innovative manufacturing technique, allowing a virtually infinite number of designs, as there are no constraints given by conventional manufacturing methods. Novel techniques require study and additive manufacturing is no exception. This work sets itself to investigate the effect of process parameters in parts produced through Laser Powder Bed Fusion (L-PBF). Samples were manufactured by keeping hatch distance and laser power constant whereas scanning speed, volumetric energy density (VED) were varied along with two different scanning strategies (30° and 60° shift by layer rotation). Outcomes were analyzed to test the effects on density, porosity, mechanical properties, surface roughness and residual stress.
The results yielded from this study suggest that as confirmed by literature increasing VED makes for more dense parts, along with low scanning speed by facilitating melting of the metal powder
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