<span style="mso-fareast-font-family: SimSun;">Optimization of Response Surface Methodology Based on Finite Element Analysis for Laser Cladding of Highly Hardened WC (Co, Ni) Coatings<span style="mso-bidi-font-size: 12.0pt; mso-fareast-font-family: SimSun;">

The present work, optimization of ceramic-based composite WC (Co, Ni) welds by laser cladding through the response surface methodology based on finite element analysis. The heat distribution and temperature field of laser melted WC(Co,Ni) ceramic coatings were simulated using ANSYS software which allowed the computation of the distribution of residual stresses. The results show that the isotherms in the simulation of the temperature field are elliptical in shape, and the isotherms in front of the moving heat source are dense with a larger temperature gradient, and the isotherms behind the heat source are sparse with a smaller temperature gradient. In addition, the observed microstructural evolution shows that the domains of the melting zone of WC(Co,Ni) are mainly composed of unmelted carbides, dendritic, rod-like, leaf-like, net-like, and smaller agglomerates of carbides in which the W content of unmelted carbides exceeds more than 80%, and the C content is about 1.5-3.0%, while the grey areas are composed of WC, Co, and Ni compounds. Based on the regression model, a quadratic model was successfully constructed. A three-dimensional profile model of the residual stress behavior was further explored. The predicted values of RSM-based FEA model for residual stress are very close to the experimental data, which proves the effectiveness of model in improving the residual stress by laser cladding .