A series of experiments were carried out with direct metal laser sintering (DMLS) for the 316 stainless steel powders.During the laser sintering,due to the large liquid phase viscosity and surface tension,the balling effect occurred when the molten did not wet the solid metal particle and the underlying substrate.This resulted in a rough and bead-shaped surface,obstructing a smooth layer deposition.The balling effect of 316 stainless steel powder was studied,and the effects of process parameters,such as laser power,scan rate,and layer thickness,on the success of laser sintering were discussed.The results showed that increasing scan rate and decreasing laser power can minish balling effect to a certain extent.
Key words
direct metal laser sintering /
metal powder /
balling effect /
process parameter
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