Direktes Laser-Sintern zum Rapid Prototyping von form-komplizierten Bauteilen aus Stahl

At Fraunhofer IWS in Dresden, the technology of direct generating of complex-shaped parts from high mehing metals has been developed in the last years. It uses the short-time loser liquid-phase sintering of composite powders. Previous experiences have been extended on alloyed structural steel 17 CrNiMo 6, heat treating steel 42 CrMo 4 and hot working steel X38 CrMoV 5 1. The sintered parts deviated from the CAD-data no more than 0.1 mm, the surface roughness R Z was mostly < 0.05 mm. The relative density was in the area 60-70% accord. ing to the process parameters. In contrast to low melting materials, considerable increase of hardness and wear resistance were found. In order to increase density and strenght, experiments of thermal and chemical infiltrating the porous sintered parts were done with the results that up to 99% can be filled by material.