Gabe Guss

TL;DR: In this paper, the authors study the denudation of metal powders that is observed near the laser scan path as a function of laser parameters and ambient gas pressure and show that the observed depletion of metal powder particles in the zone immediately surrounding the solidified track is due to a competition between outward metal vapor flux directed away from the laser spot and entrainment of powder particles.

TL;DR: In situ X-ray imaging and finite element simulations are used to show how detrimental pores form under printing conditions and develop a strategy to suppress them and provide insight into the physics of laser-metal interaction.

TL;DR: The physics of droplet ejection under strong evaporative flow is described using simulations of the laser powder bed interactions to elucidate the experimental results and the relevance of vapor driven entrainment of metal micro-particles to similar fluid dynamic studies in other fields of science will be discussed.

TL;DR: In this article, the effective absorptivity of continuous wave 1070nm laser light has been studied for bare and metal powder-coated discs of 316L stainless steel as well as for aluminum alloy 1100 and tungsten by use of direct calorimetric measurements.

TL;DR: High-fidelity simulations are used to capture fast multitransient dynamics at the meso-nanosecond scale and discovered new spatter-induced defect formation mechanisms that depend on the scan strategy and a competition between laser shadowing and expulsion that will help improve build reliability.