Study on Process , Structure, and Properties of Nickel Selective Laser Melting

The pure Ni samples were formed by selective laser melting technology. The influences of linear energy density on the density, microstructure, mechanical properties, and electrochemical properties of nickel solid were investigated under a certain layer thickness and hatch distance. The results indicated that under the linear laser energy density of 244.8 J/m, the comprehensive performance of formed part was the best. Under this condition, the surface of the formed parts was smooth, the surface roughness was 10. 5 mu m, the density was 99.7%, the microhardncss was 165. 1 HV0.2, the tensile strength reached 420 MPa, the yield strength was 321 MPa, the elongation was 23.2%, and the fracture was ductile. In the solution with mass fraction omega (NaOH) =20%, the self-corrosion potential of hydrogen evolution reaction was -1. 5 X 10(-6) m Lambda . cm(-2), and the polarization passivation region was from -1.038 V to 0.442 V.