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This work examined the effects of a TiN coating on the high-cycle-fatigue (HCF) and very-high-cycle-fatigue (VHCF) properties of the Ti-6Al-4V alloy using a three-point bending ultrasonic fatigue testing machine. Three different TiN coatings with total thicknesses of 5, 15 and 25 μm were deposited on a Ti-6Al-4V alloy substrate. Scanning electron microscopy was used to examine the fracture surface. Fatigue results indicate that there is no traditional fatigue limit, and  S–N  curves show a continuously decreasing trend for uncoated and coated specimens. Fractography analysis shows a change from the surface to the subsurface initiations for the uncoated specimens and nucleation at the defects of the coatings for the coated specimens. A TiN coating can decrease the fatigue strength of the substrate, and the fatigue life decreases with increasing total thickness. Furthermore, delamination can be observed at the interface in the HCF regime.

Effects of TiN coating on the high-cycle-fatigue and very-high-cycle-fatigue properties of Ti-6Al-4V alloy