Abstract
Considering the phenomenon during teeth cooperation in a toothed gear and produced loads within the macro and micro areas of contact surface, one should be paying attention to the type and condition of the surface layer. Shot peening is often recommended, especially for gears particularly loaded in addition to hardening by heat treatment. Therefore, the study presents hardness changes in tooth surface layers after shot peening, when the surfaces had been previously carburized and quenched. The article presents hardness distribution over the depth of the teeth. Measurements were made on oblique polished and etched surface, which allows the identification of the microhardness near the outer surface and through the depth up to the core. Furthermore, based on data analysis obtained from X-ray diffraction, the amount of retained austenite was estimated and changes in the metallographic structure after shot peening were illustrated.
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