Effects of Particle Size on Density and Properties of 3D Printing TC4 Titanium Alloy
TC4 titanium alloys with different powder sizes were printed,cured and sintered by binder jetting 3D print-ing technology.Microstructure and mechanical properties of TC4 titanium alloys were investigated by metallographic microscope,SEM and mechanical properties test.The results indicate that the sintered density of TC4 titanium alloy is increased with the decrease of powder particle size.The sintering density reaches the maximum of 4.43 g/cm3 with powder particle size distribution D50 of 8.49 μm,and relative density reaches up to 98.2％.Considering the optimum matching of tensile strength and plasticity of binder jetting 3D printing TC4 titanium alloy after sintering,the optimal powder particle size distribution is D10=6.45 μm,D50=12.60 μm,D90=22.10 μm,where the tensile strength,elonga-tion and hardness of sintered TC4 titanium alloy is(935±12)MPa,(12.7±0.6)％,and(341±4)HV,respectively.
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