HIGH SPEED VIDEO IMAGING OF OVERHANG SURFACES IN BEAM SHAPED LASER POWDER BED FUSION OF 316L STAINLESS STEEL

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Date

2023

Authors

Vanmunster, L.
Dejans, A.
Van Hooreweder, B.
Vrancken, B.

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University of Texas at Austin

Abstract

Beam shaping has seen rising interest in the AM industry and research field because of the increased level of control over the spatial distribution of the thermal input during Laser Powder Bed Fusion, allowing for faster build rates. This report investigates if the more uniform heat input offers benefits to the scanning of unsupported overhanging structures. In-situ high speed video imaging is combined with post process surface characterization to derive a relation between the scan parameters and quality of the overhang surface. The best results were achieved at low energy densities, but no clear advantage of top-hat shaped laser spots over the standard Gaussian beams is observed.

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