Crevice induced pitting – The failure was due to pitting induced by crevice between the sliding surfaces. The pitting occurred is a localized one. The formation of differential aeration cell in the crevice between the mating surfaces lead to the formation of pits.

The initiation of pitting is mostly confined to the pitch lines or areas above and below the pitch line. Pitting caused by surface contact is the consequence of surface contact fatigue. The cumulative effect of fatigue cracks results in the surface damage leading to pitting, which is accelerated by crevice.

Use AMS 632 Steel, carburize, harden and temper to specifications for application.