Laser melting of powder materials with developed morphology of granules

Abstract

In this paper, we consider the possibility of increasing the efficiency of laser melting by changing the morphology of the powder. To change the absorptivity of the granules, the treatment of the material was carried out by the mechanical action of the abrasive material on the metal powder base. As a result of grinding the powder composition in a planetary mill, the surface and shape of the granules were greatly altered, and a developed microrelief was formed. This was recorded with the help of scanning electron microscopy. Experiments on the fusion of the synthesized powder material took place on an installation equipped with an iterbium fiber laser operating in a continuous mode of radiation generation. The formation of a layer in the cross section was studied. It is noted that the developed developed morphology of the powder granules absorbs laser radiation to a much greater extent than the smooth surface, thereby increasing the efficiency of laser melting. The use of this method made it possible to significantly reduce the energy of laser radiation necessary for fusing the powder.