工艺参数对选区激光熔化成形可降解纯锌相对密度及力学性能的影响

Effect of Processing Parameters on Relative Density and MechanicalProperties of Selective Laser Melted Biodegradable Pure Zinc

摘要: 采用选区激光熔化（SLM）技术制备纯锌，研究了激光功率和扫描速度对其相对密度和力学性能的影响。结果表明：随激光功率增大或扫描速度减小，SLM成形纯锌的相对密度和硬度增大，显微组织均为平行于成形方向生长的柱状晶；SLM成形纯锌的最佳工艺参数为激光功率100 W、扫描速度300 mm·s^-1，所得试样的相对密度达99.86%，硬度为（44.7±1.2） HV，弹性模量、断后伸长率、抗拉强度、屈服强度分别为（48.6±2.4） GPa、（8.9±0.7）%、（95.5±3.3） MPa、（67.1±0.4） MPa。

Abstract: The pure zinc was manufactured by selective laser melting (SLM) technique,and the effect of laser power and scanning speed on the density and mechanical properties of the pure zinc was studied. The results show that with increasing laser power or decreasing scanning speed, the relative density and hardness of the SLM formed pure zinc increased, and the microstructure was columnar crystals with growth direction parallel to the building direction. The optimal parameters for the SLM formed pure zinc were the laser power of 100 W and scanning speed of 300 mm·s^-1; the relative density of the obtained sample reached 99.86%, the hardness was (44.7 ±1.2) HV, and the elastic modulus, elongation after fracture, tensile strength and yield strength were (48.6±2.4) GPa, (8.9±0.7)%, (95.5±3.3) MPa, (67.1±0.4) MPa, respectively.