An investigation on thecladdinglayeron thepuretitanium surfacebylasermelting

In this paper, Ti+B₄C cladding layer was prepared on pure Ti surface to improve the surface hardness by laser melting. By comparing the appearance of samples with 12 different process parameters, four laser cladding processes in them were selected for further evaluation. In other words, when the laser power is not less than 1050W and the content of B₄C powder is not less than 15%, a smooth and uniform cladding layer could be obtained. Following, microstructure analysis and hardness test were employed to evaluate the quality of the cladding layer. The results show that when the content of B₄C powder is 15%, the fusion layer of the specimen is well bonded to the substrate. And the hardness of the cladding layer increases with the distance from the interface. And when the laser power is 1200W, the highest hardness reaches 1240Hv. However, when the B₄C content is 20%, a continuous transition layer appears between the cladding layer and the substrate. The hardness test results show that the hardness of the transition layer is low. It would affect the bonding quality. Therefore, the best process for preparing a high hardness cladding layer on the surface of TA2 using laser cladding technology is: laser power is 1200W, and B₄C content is 15%.