Nitrriding is a one of the processes which is used to increase material surface hardness. Nitrogen supersaturated layer on the material surface significantly decreases its friction coefficient. With decreasing friction coefficient an improvement of material wear resistance should be expected. It was proved in a numerous research works on sliding wear of nitrided layer. The changes of the microstructure in the surface of the nitrided material resulted in increasing its fatigue resistance, mostly due to residual compressive stresses introduced into the material surface during nitriding process. In this research the mechanism of one specific case of fatigue wear is described. The performed studies allowed to observe two different mechanisms of pitting wear initiation at the nitrided layer. One of them began with the formation of the pervious fatigue cracking at the material surface and in the case of second one the pitting wear was initiated at the subsurface area.Keywords: Nitriding, surface layer, pitting wear, cracking, steel
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