Stellite3-Ti3SiC2-Cu composite coatings on IN718 by laser cladding towards improved wear and oxidation resistance

To improve the wear and oxidation resistance of IN718 (Inconel 718) superalloy under severe conditions, a series of Stellite3 matrix composite coatings containing Ti 3 SiC 2 /Cu were prepared by laser cladding. Further, the phase compositions, microstructure, microhardness , oxidation and tribological behaviors were systematically studied. The results indicated that the coatings' microhardness is 1.8–2.5 times higher than the IN718, and the wear rates decreased obviously at room temperature, with the Stellite3–5%Ti 3 SiC 2 –10%Cu coating performing the best wear resistance. In addition, under high temperatures, the oxidation rate constant and wear rate of Stellite3–10%Ti 3 SiC 2 coating are 2.7065 mg 2 ·cm −4 ·h −1 and 6.09 × 10 −5 mm 3 /N·m with better oxidation resistance and wear resistance, where oxidation wear and slight abrasive wear predominating. This work explored the feasibility and detailed effects of Ti 3 SiC 2 and Cu for enhancing the Stellite3 composite coatings. • The Stellite3-Ti 3 SiC 2 -Cu composite coatings were successfully prepared on Inconel 718 superalloy by laser cladding. • The MAX phase Ti 3 SiC 2 elevated the oxidation resistance of composite coatings. • The Cu element is uniformly distributed in the Stellite3–5%Ti 3 SiC 2 –10%Cu composite coating to improve its toughness. • The MAX phase Ti 3 SiC 2 and soft metal Cu played lubrication and protection roles in the coatings, which improve the tribological properties. • The wear mechanisms were investigated from the morphology of surface and wear affected zone respectively.