Effect of Process Parameters on Forming Quality and Hardness of TA32 Titanium Alloy Formed by Selective Laser Melting

TA32 titanium alloy samples were prepared by laser selective melting (SLM), and the effects of laser power (200—400 W), scanning speed (800—1 200 mm·s^-1) and scanning distance (90—130 μm) on the forming quality and hardness were studied. The results show that as the scanning speed increased, the surface roughness of SLM formed TA32 titanium alloy decreased first and then increased, and the relative density and Vickers hardness gradually decreased. As the scanning distance increased, the surface roughness of the titanium alloy decreased first and then increased, and the relative density and Vickers hardness decreased and then increased. As the laser power increased, the surface roughness of the titanium alloy decreased first and then increased, and the relative density and Vickers hardness increased first and then decreased. The laser energy density range suitable for SLM forming of TA32 titanium alloy was 45—75 J·mm^-3.