Laser cladding NiCoCrAlY coating on Ti-6Al-4V

In order to improve wear resistance of titanium alloy, a process of laser cladding NiCoCrAlY coating on Ti-6Al-4V substrate with pre-placed NiCoCrAlY powder was studied. A good coating without cracks and pores was obtained in a proper laser process. The microstructure of the coating was examined using SEM and EDS. There is a metallurgical interface bonding between the coating and the substrate. The microstructure of Ni-base alloy coating is homogeneous austenite γ-Ni in cell and cell-dendrite morphology. The result of Vicker hardness tests that the average microhardness of the coating is HV800∼HV1000, and it is two times higher than that of Ti-6Al-4V substrate.