Fe-Ni系金属粉末选区激光熔化成型工艺研究

Study on Selective Laser Melting Process of Fe-Ni Metal Powder

选区激光熔化(SLM)技术可用于金属粉末快速制作冶金实体,成型件致密性是SLM工艺研究的重点,也是制备金属制件的基本要求。选用铁镍系金属粉末,在不同的激光功率、扫描速度和铺粉厚度等工艺参数条件下,采用单道扫描和多层单道扫描等方式进行实验,并利用扫描电镜对不同工艺所制备的试样进行微观形貌研究和致密性分析,确定了优化的工艺参数匹配并制备出块体试样,致密度达80%以上。

Selective laser melting （SLM） technique can be used to form a metallurgical compact entity by laser beam melting metal powder. The compactness is the pursuit of the goal of selective laser melting, also is the basis of fabricating parts. The samples of Fe-Ni metal material were prepared by SLM technique, choosing iron nickel alloy powder, under different technological parameters, laser power, scanning speed, spread powder thickness, single channel scan, multilayer single channel scan and so on. By scanning electron microscopy（SEM） and compactness testing, the microstructure and density of the samples prepared under different process parameters were contrasted. On the basis of experiment, the optimized parameters are determined and the compact block is eventually fabricated. The density ratio reaches 80%, which is in high level.