Interrelation of wear resistance, surface roughness and carburized structural steels quenching parameters

The essential relationship of high-altitude indexes of roughness Ra, Rz Rmax of worn out surface and the relative wear resistance of the surface layers of the steels (0,27% C) and (0,55% C, 1% Mn) after carburizing and quenching by different regimes have been established. An opportunity to apply the methods of statistical analysis for evaluation of the shape roughness was shown. A correlation between the coefficient of relative durability and characteristics of the worn-out surface shape was found. The opposite effect of the heating temperature for quenching on wear resistance and surface roughness was displayed. The wear resistance of carburized steel (0,27% C) and (0,55% C, 1% Mn) is increased by quenching from 1000°C due to changes in the structural-phase state of the surface layer. Wearing out of the hardened surface is more smooth and even due to the high content of Ares in the carburized structure, that is capable of ′ strain-induced martensite trans-formation at wearing (DMTW). DMTW causes additional self-strengthening of the surface working layer as deformation martensite is more dispersed and solid as compared with quenching martensite. The interrelation between wear resistance and surface roughness has been defined. With an increase in the wear resistance of the investigated steels the roughness characteristics decrease following the linear pattern