以纯镍粉末为原料,通过激光选区熔化探究制备镍实体的优化工艺参数,研究了在一定铺粉层厚和扫描间距下,线能量密度对镍实体的致密度、显微组织、力学性能以及电化学性能的影响。结果显示:在线能量密度为244.8 J/m参数下,激光选区熔化(SLM)成形镍实体的综合性能最佳。该条件下成形件表面平整,表面粗糙度为10.5 μm,致密度为99.7%,维氏硬度为165.4 HV0.2,抗拉强度为420 MPa,屈服强度为321 MPa,伸长率为23.2%,断口为韧性断口。在质量分数ω (NaOH)=20%溶液中析氢反应自腐蚀电位为-1.5×10 -6 mA·cm -2,其极化钝化区域为-1.038~0.442 V。

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 μm, the density was 99.7%, the microhardness was 165.4 HV_0.2, 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 ω (NaOH)=20%, the self-corrosion potential of hydrogen evolution reaction was -1.5×10 ^-6 mA·cm ^-2, and the polarization passivation region was from -1.038 V to 0.442 V.