INVESTIGATION OF WEAR PRODUCTS OF HIGH-NITROGEN MANGANESE STEELS

The wear rate of hydrogenated specimens of high-nitrogen cold-worked manganese steels is five times larger than that of nonhydrogenated ones. In the absence of hydrogenation, the size of the wear products ranges from 25 to 40 mu m at P = 400 N and from 40 to 100 mu m at P = 500 N. For hydrogenated specimens, the size of the wear products is above 350 mu m under a load of 250 N and ranges from 600 to 1000 mu m at P = 400 N. The morphology of the wear products demonstrates an excellent microrelief, which indicates that fracture occurs by different mechanisms of fracture during the formation of a particle under friction conditions. On the products, we detected dimples in which, probably, particles containing sigma-type intermetallics, carbides, and nitrides, which cause the initiation of cracks under both sliding friction and rolling friction, spalled.