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This study compares the effects of nitriding and carburizing processes applied to gears subjected to contact\udstresses below 1300 MPa. The manufacturing cost, as well the depth of hardened layer and the distortion produced\udby two processes are analyzed. AISI 4140 gears quenched, tempered, liquid and gas nitriding and AISI 8620 gears after\udliquid carburizing, quenching and tempering are analyzed. The dimensional control of the gears was carried out before\udand after heat and thermochemical treatments. It is concluded that liquid or gas nitriding processes are about 30% more\udeconomical than liquid carburizing an also they reduce the dimensional changes. By the other hand liquid carburizing\udachieves greater case depth. Liquid nitriding process presents the lowest cost, dimensional changes and case depth

EFEITOS DA CEMENTAÇÃO E DA NITRETAÇÃO NO CUSTO E NA QUALIDADE DE ENGRENAGENS PRODUZIDAS COM AÇOS ABNT 4140 E 8620