Abstract
Carburizing and fatigue properties of plasma carburized SCM 420 have been studied. During plasma carburizing the surface carbon content rapidly reaches to the carbon solubility of austenite phase, and the carburizing rate is larger in plasma carburizing than in conventional gas carburizing. The high surface carbon content obtained by plasma carburizing results in low case hardness due to its large amount of retained austenite and in carbides precipitation. Therefore it is nessesary to add the diffusion period after carburizing to optimize the surface carbon content. It is confirmed that carbon content and case depth are controlled by the combination of carburizing and diffusion time.Gear and rotating bending fatigue tests, furthermore, prove that plasma carburized steel shows higher fatigue strength than conventionally carburized one. It is considered due to internal oxidation free surfase micro structure.
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