文摘
As the laser energy input increases from 0.32 × 105 W/cm3 to 1.30 × 105 W/cm3, the intensity and the quantity of spattering increases, the metal liquid jetted out and reached to the height of 11 cm. Spattering included three types mainly caused by recoil pressure, Marangoni effect and heat effect in molten pool, these three different sources of spattering leading to three types of spattering morphology correspondingly. The compositions of spattering powers are almost the same as the original powders, but the contents of O, Si and C increase dramatically. Spattering particles have an average size of approximately 162 µm compared with the original powder size of 32 µm. The spattering particles are embedded into the surface and interior of the SLM-fabricated parts to deteriorate the finial fabricated parts.
