Bearing surface cracks

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Fatigue failure of the bearing surface of the failure of one of the forms, and the failure of the metal in the long-term effect of the alternating load, mainly as a fatigue crack initiation, propagation and fracture process. The generatio n of cracks in two ways:thin ball bearings
First: generated from the surface, i.e. in contact with the process, a rolling bearing, because the role of the external loading on the work surface to cause a periodic variation of the contact stress generated in the surface of plastic deformation and deformation hardening, the last minor cracks appear in the work surface by the surface development, the crack formed between the two surfaces, so that the crack due to the lubricant wedged into wall opening force, to force the crack to move forward to the inside;
Second: crack generated from the surface, i.e., in surface contact stress under repeated, cracks originally generated at a certain depth, and development, reaching a certain depth from the surface along with the direction of the surface of the angled away from the contact surface after , and beyond to the surface up the final formation of pitting spalling, left behind on the contact surface under a pits.
Crack is generated from the surface or from the surface, these two cases are objective (parts after carburizing, surface hardening heat treatment such as, if there is uneven hardness inhomogeneity and an unfavorable internal stress, in the contact stress under the effect of the crack is generally generated from the subsurface. Conversely, if processing poor quality of the surface of the part, there is a defect (oxidation, decarburization), friction or lubrication is poor, and the crack generated from the surface.machine bearing