Abstract
To clarify the relationship between fatigue properties and fusing methods, using vacuum furnace and induction heating system, rotational bending fatigue tests were performed on a medium carbon-steel(S35G) coated with thermally sprayed Ni-based self-fluxing alloy, under the condition of a fixed fusing temperature of 1010℃. As a result of these fatigue tests, the specimens fused by vacuum furnace (fusing time:30minutes to 10hours) did not show any delamination under cyclic loading. And a gradual reduction in fatigue strength was observed with the increase of fusing time. This is caused by the formation of inhomogenety in the coating layer with the increase of fusing time. On the contrary, the specimens fused by induction heating system(fusing time:200 seconds to 4hours)showed nearly the same fatigue strength as substrate did, because every specimen of these series showed delamination between substrate and coating layer. But formation of inhomogenety in the coating layer did not observed as specimens fused by vacuum furnace.
