Effect of hatch distance on CuSn10 specimens by selective laser melting

Selective laser melting SLM is one of promising additive manufacturing methods especially for precision parts Its application in copper alloys is of significance However there is rare research achievements about the effect of fabrication parameters on the microstructure and quality of copper alloy parts In this paper tin bronze CuSn bars were fabricated with different hatch distance from mm to mm and different scanning speed from mm s to mm s but same area laser energy density Porosity is mainly dependent on hatch distance instead of scanning speed The porosity decreases with the decrease of hatch distance Their microstructure was rose like fine grain cluster growing from melt pool border to pool center in which fine columnar grain is about mu m times mu m and equi axed grains is about mu m in diameter The formed specimens achieved high hardness HRB at hatch distance mm Fine microstructure leads to the improvement of mechanical properties