利用激光熔覆技术, 在45#钢板上制备Ti/YCF104合金涂层, 利用激光共聚焦显微镜和显微硬度计分别对熔层组织和显微硬度进行了测试。结果表明, 随着Ti含量的增加, 熔层稀释率逐渐增大。Ti有助于细化晶粒, 当Ti含量在1%左右时, 组织最均匀。随着Ti含量增加, 组织生长驱动力变大, 晶粒长大, 组织变粗大。Ti含量在1%左右时, 熔层显微硬度变化不大, 但由于组织均匀化程度提高, 显微硬度波动小。随着Ti含量增加, 显微硬度值明显减小。在一定Ti含量范围内, 熔层显微硬度对Ti含量不敏感。

Ti/YCF104 alloy coating was fabricated on the surface of 45# steel plate by laser cladding technology. The microstructure and microhardness of the cladding layer were measured by laser confocal microscopy and microhardness tester, respectively. The results show that the dilution rate of the cladding layer increases gradually with the increase of Ti content. Ti helps to refine the grains. When the content of Ti is about 1%, the microstructure is the most uniform. With the increase of the Ti content, the driving force for particles growth has been promoted, and the grain grows and the structure becomes coarser. When the content of Ti is about 1%, the microhardness of the cladding layer has little change, but the fluctuation of microhardness is small which is caused by the homogenization degree of the microstructure. The microhardness is obviously decreased with the increase of Ti content. In a certain range of Ti content, the microhardness of the cladding layer is insensitive to the content of Ti.