选区激光熔化工艺参数对Ti-6Al-4V成形质量的影响

选区激光熔化是一种利用高能束选择性熔化金属粉末进而直接制造复杂几何形状产品的增材制造技术。采用选区激光熔化成形Ti-6Al-4V样品,分析影响选区激光熔化成形质量的主要因素,采用体式显微镜、金相显微镜、扫描电子显微镜(SEM)、显微硬度计系统研究了不同工艺参数对Ti-6Al-4V合金选区激光熔化成形样品的表面形貌、致密度、组织、显微硬度的影响规律。研究得出Ti-6Al-4V合金选区激光熔化成形的优选工艺参数为:扫描功率450W,扫描速度2 500mm/s,扫描间距0.07mm,该工艺参数下打印出的样品具有较为优良的成形质量,致密度高达97.8%,显微硬度平均值为446HV。

Influence of Process Parameters of Forming Characteristics on Ti-6Al-4V Fabricated by Selective Laser Melting

Selective laser melting (SLM) is an additive manufacturing technique,through which functional, complex parts can be created directly by selectively melting metal powders. The influence of the processing parameters on the forming characteristics of metallic powder fabricated by SLM was discussed. The surface features, density, micro-hardness and microstructure were investigated by stereomicroscope, light optical microscopy, scanning electron microscope(SEM), microhardness tester in order to evaluate the forming quality of Ti-6Al-4V alloy fabricated by SLM with different scanning power (P), scanning speed (V), scanning width (S). The results indicated that Ti-6Al-4V fabricated by SLM with the parameters of P=450 W, V=2 500 mm/s, S=0.07 mm could obtain good surface quality, the density could reach 97.8%, the average micro-hardness was 446HV.