Correlations of laser scanning parameters and porous structure properties of permeable materials made by laser-beam powder-bed fusion

Laser-beam powder bed fusion (LB-PBF) of metals is an additive manufacturing (AM) method currently being pursued in numerous industries. In this study, the effect scan strategy, laser spot size, and hatch distance on pore structure additively manufactured permeable stainless steel materials was systematically studied through analysis material permeability, size distribution, porosity, surface morphology. When wide power low, two kinds pores are formed were studied. The first one located between laser-melted tracks, second type generated inside tracks. Scan strategy have no obvious but they affect attached surface, material. Hatch plays important role controlling properties. larger than 0.13 mm, weakened, permeability increases significantly. By optimizing these parameters, with sizes ranging from 2.6 to 13.7 µm a thickness 0.89 mm fabricated. To illustrate potential method, for time planar permeable-dense metallic membrane substrate internal flow channels fabricated, which center piece new compact modular integrated reformer system.