Analysis and optimization of laser cladding Ti-B4C composite coatings based on the interaction and GABP-NSGAII algorithm
Dingding Xiang, Di Wang, Shu Wang, Liang Yan, Yu Chen
Abstract
Laser cladding process parameters are important to the quality of cladding layer , but the interaction between parameters is not clear. In this work, the effects of parameters, especially interaction, on laser cladding of Ti-B 4 C coating were studied by orthogonal experiments. And the optimal process parameters were obtained by GABP-NSGAII multi-objective optimization algorithm. The results show that the interaction (B 4 C content and laser power) had the greatest effect on the coating aspect ratio, cladding angle, and dilution rate . The microhardness of the coatings prepared with the optimum parameters of 15 wt%, 2200 W, and 800 mm/min is 434 HV 0.5 , which consists of columnar, dendritic, and equiaxial structures from the interface to the surface, respectively. The interaction affects the molten pool flow and the distribution of unfused B 4 C particles, and influences the concentration and distribution of reinforcing phases in the coating, as well as the heat input and phase transitions in the heat affected zone . This paper provides a reference for the preparation of high-performance and high-quality titanium matrix composite coatings by laser cladding.