Effect of High-Velocity Oxy-Fuel (HVOF) sprayed Tungsten Carbide Nickel (WC-Ni) Coating on the Fatigue Strength of Carbon Steel with Different Spraying Distances

This research aims to determine the impact of varied spraying distances of 200 and 250 mm for HVOF spraying of tungsten carbide-nickel (WC-Ni) coating on the fatigue strength of S50C carbon steel. The fatigue test is performed on the coated specimens using the Shimadzu Servopulsor testing machine according to ASTM E466 for axial fatigue testing. The fracture surface was analysed by scanning electron microscope (SEM). The findings showed that the fatigue strength of the coated carbon steel decreased compared to the uncoated specimen. Also, the coated carbon steel fatigue strength increased with increasing spraying distances from 200 mm to 250 mm. There are two separate zones on the shattered surface: a burnished, smooth region and a granular, rough region. The fatigue fracture developed in the area that was burnished and smooth.