DefinePK

Abstract

Rotary elements exhibit the fatigue failure due to the insufficiency of fatigue strength. EN8 steel was investigated through various heat treatment processes for its fatigue behavior as it finds core application on the production of transmission shafts, crankshafts and gear. Nitriding was influenced to base metal specimens at the temperature of 5600C in cyanide salt bath. The specimens undergone with induction hardening experienced the electrical input of 32kW at 1800C. As combined heat treatment exhibits better output in fatigue strength, the nitrided specimens were introduced induction hardening with 80 KHz frequency. Hardness test and Tensile test were carried out. Rotary Fatigue testing was done in Cantilever type Fatigue testing Machine. Results indicate that Improved fatigue strength was attainable by the combined heat treatment process of Nitriding followed by Induction hardening. Fracture study was done using SEM.