Wear Resistance of Different Bionic Structure Manufactured by Laser Cladding on Ti6Al4V

In this study, the laser cladding system with an IPG YLS-6000 fiber laser was used, and the WC-Ti6Al4V powder reinforced composite coatings on Ti6Al4V titanium alloy with various bionic structures were innovatively fabricated. The microstructures and surface damage behavior of the coatings were characterized by scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffraction. Additionally, the wear resistance of different bionic structures was evaluated, which had not been comprehensively explored in the published literature. The results indicated that the un-melted WC particles in the coatings act as a hard reinforcement, avoiding serious wear of the coating. In addition, the hard coatings exhibit excellent deformation resistance and the soft substrate cushion the shear stress. So when the "Ratio", which refers to the laser cladding area to sample area, is between 0.25 and 0.3, the sample has the highest wear resistance. Furthermore, the "Dot + Line" bionic structure has the best wear resistance compared with other structures. The separated line units and the addition of dot units can improve the stress concentration state of bionic structure are conducive to release the stress to the substrate under the cladding layer. Graphic