Powder Characteristics and Selective Laser Melting Forming Properties of CoCrMoW Alloy

CoCrMoW alloy powder for 3D printing was prepared by vacuum gas atomization. Particle characteristics were studied and the Ell.Elongation, ISO Circularity and Outgrowth were introduced to characterize the particle shape. And the Selective Laser Melting (SLM) forming properties of the powders and electrochemical properties of the formed parts were studied. The results indicate that the measured D10, D50 and D90 are 12.50, 28.71 and 58.05 mu m, respectively. The majority of powder particles are spherical or nearly spherical and the mean Ell.Elongation and ISO Circularity are 0.212 and 0.607, respectively. About 74.89% of the powder particles have no adhesion on the surface. The apparent density and tap density are 4.82 and 5.71 g/cm(3), respectively, and the compressibility is 15.6%. The CoCrMoW powder is suitable for SLM and the relative density and surface roughness are 98.7% and 8.3 mu m, respectively. The microhardness. (HV), tensile strength, yield strength and elongation are 3960 MPa, 1154 MPa, 852 MPa and 8.5%, respectively. And the corrosion resistance of CoCrMoW alloy prepared by SLM is better than that of the cast alloy.