Abstract
Spalling and Scuffing are well known as the failure pattern of case-carburized gear. Micropitting was recently recognized as a failure too and already became a problem. Micropitting is very small failure on the contact surface. Despite of its size, it can lead, by accumulating, to several failures such as frosting or fatigue scuffing. In this study, the authors investigated the occurrence of micropitting and its tendency to increase in quantity. A disk machine with rolling and sliding was used. Fatigue tests were carried out with carburized SCM420 steel rollers and SCM420 steel rollers shot peened by two different methods ; ultrasonic shot peening and air shot peening. Micropitting was generated by load around 1/4 of the load that causes spalling. Quantity of micropitting increased as the number of cycles increased. Micropitting was observed in the faster test roller and its amount was less than the slower side. S-N curve was obtained from the fatigue life, which is assumed as the number of cycles in which the micropitting area reaches 5%. As a result, the influence of the surface roughness seems to be large in the fatigue life of the micropitting.
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