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Ozsoy, Andac
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document
The Laser Powder Bed Fusion Process Development of 17-4 PH Stainless Steels with Pulsed-Wave Lasers
Abstract
The main advantage of using Laser Powder Bed Fusion is its unique capability to produce highly complex geometries with intricate features. Besides other differences in powder coating and gas circulation among various LPBF machines, the type of laser (continuous or pulsed wave) is the most critical one. In addition to several process parameters to be optimized for a specific material, pulsed-wave lasers bring extra factors to consider. In this work, a pulsed-wave laser was used to develop process parameters for 17-4 PH stainless steel while keeping volumetric energy density, laser power and velocity constant to understand the effect of pulse related parameters on the outputs. As the point distance (PD) between consecutive laser spots was increased, the exposure time was also raised to keep the scan speed constant. This enabled achieving PDs with one extreme end approaching CW-lasers while the other end aiming at keyhole effect.