铜磷合金粉末选区激光熔化成型研究

为了应用选区激光熔化技术直接制造金属零件,采用Dimetal 240快速成型机对平均直径为75μm的铜磷合金粉末进行了工艺试验。成型机配备200W半导体抽运Nd:YAG激光器,激光功率为103W～117W,内部扫描速度为0.25m/s～0.41m/s,边框扫描速度为0.15m/s,铺粉厚度为0.2mm。所得试样用扫描电镜和光学显微镜进行了微观组织分析。试样层问结合为冶金结合,致密度达到90%以上,层内组织为细长枝晶,层问组织为细小等轴晶。结果表明,通过设定合适的工艺参量,选区激光熔化技术可以直接成型金属零件。

Selective laser melting of CuP alloy powder

For the sake of fabricating metal parts directly, experimental study on rapid manufacturing metal parts from CuP powder with a average particle size of 75μm was applied using selective laser melting technology. Experiments were carried out on Dimetal 240 machine equipped with a 200W CW Nd-YAG laser. The sample was made under optimized processing parameters as follows: laser power 103-117W, scanning speed 0.25-0.41m/s (inner), 0.15m/s (frame), powder thickness 0.2mm. The scanning electron microscope (SEM) and the metalloscope were used to analyze the microstructure and the molten pool of the sample. The results show that a complete metallurgical bonding is obtained by selective laser melting process, and the density reaches 90%. The intralayer microstructure is slender arborescent crystal, while microstructure between layers is small isometric crystal.