Friction Performance Analysis of WC-Reinforced IN718 Composite Material Based on SLM Process

To enhance the wear resistance of nickel-based high-temperature alloys, IN718/WC composites were prepared via selective laser melting (SLM). The optimal molding process parameters of IN718/WC composites were determined using a combination of experimental and simulation methods. Based on the SEM images of the composites, a gradient transition layer was found to form between the WC particles and the IN718 matrix, and the γ′ and γ″ reinforcing phases dispersed into the matrix, providing lubrication and reducing wear during friction. The influence of WC content on the wear resistance of the composites was investigated. When the WC content was 5%, the molded parts showed optimal wear resistance, the friction coefficient fluctuated steadily, the degree of wear was low, and the amount of wear was reduced to 0.02973 mm3. The average friction coefficient and wear volume of the molded parts with similar contents decreased by 26.95% and 4.27%, respectively, compared with the pure IN718-molded parts. This study provides a case study and guidance for further optimization of the molding process for nickel matrix high-temperature composites prepared using the SLM method.