扫描速率对激光熔覆镍基合金涂层性能的影响

为了提高材料表面强度和硬度，在材料的表面采用激光熔覆技术熔覆合金涂层以提高其表面性能。相同的激光功率下采用不同的激光扫描速率在材料表面激光熔覆制备镍基（Ni60）复合涂层，取得了在基材表面获得理想熔覆层的工艺参量，并对熔覆层的性能进行了检测。结果表明，随着激光扫描速率的增加，表面粗糙度变大，熔覆层的宽度、高度、基材的熔化深度都有一定程度的降低，裂纹出现增大趋势，熔覆层显微硬度高出基材显微硬度约500HV，激光熔覆技术在一定范围内可以实现对基材的表面硬化。该结果为材料表面强化的研究提供了参考。

Effect of scanning speed on the properties of laser cladding nickel-based alloy coating

In order to improve the surface strength and hardness of the material, laser cladding technology was used to clad the alloy coating on the surface of the material to improve its surface properties. Nickel-based (Ni60) composite coating was prepared by laser cladding on the surface of material under the same laser power at different laser scanning speeds, and the processing parameters for obtaining the ideal cladding layer on the surface of the substrate were obtained. The properties of the cladding layer were detected. The results show that, with the increase of the laser scanning rate, the surface roughness becomes larger, the width, height of cladding layer and the melting depth of the substrate are reduced to a certain extent. The cracks appear to increase. The microhardness of the cladding layer is about 500HV higher than that of the substrate. The laser cladding technique can realize the hardening of substrate surface in a certain range. The results provide a reference for the study of surface strengthening of materials.