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在激光近净成形过程中,为了改善熔覆层组织形态,提高熔覆层力学性能,通过实验研究了激光功率、扫描速度和送粉速率对Ni60粉末成形组织和力学性能的影响。研究结果表明,成形组织形态随着激光功率增大变得粗大,随着扫描速度、送粉速率的增大变得细小;从基体到热影响区再到熔覆层,其硬度值明显增加;显微硬度随着激光功率的增大而减小,随着扫描速度和送粉速率的增加而增加。研究为多孔金属生物材料的制备提供了优化工艺参数组合的依据。
In the process of laser near net forming, in order to improve the microstructure of cladding layer and improve the mechanical properties of cladding layer, the effects of laser power, scanning speed and powder feeding rate on the microstructure and mechanical properties of Ni60 powder were investigated experimentally. The results show that the shape of the formed microstructure becomes coarse with the increase of the laser power, and the increase of the powder feed rate becomes small with the increase of the scanning speed. The hardness value increases obviously from the matrix to the heat affected zone to the cladding layer. The microhardness decreases with the increase of laser power and increases with the increase of scanning speed and powder feeding rate. The research provided the basis for optimizing the combination of process parameters for the preparation of porous metal biomaterials.