THE COMPARISON OF THE RESIDUAL STRESSES BETWEEN CARBURIZED AND ONLY QUENCHED STEELS

Abstract

In this study, the residual stresses developing in carburized and only quenched steel of SAE 8620 (21NiCrMo2) which is widely used as a carburized steel (shafts, gears etc.) was investigated. Carburizing programs was carried out in gas atmosphere for 45 minute at 940 °C. X-ray analysis was used to determine residual stress in the microstructures of the only quenched and carburized specimens. The results of x-ray analysis have shown that while the carburized specimens have a residual compressive stress at the surface -551N/mm 2 , the only quenched specimens have a residual compressive stress at the surface -125 N/mm 2 .

Keywords

• Sementasyon, Artık gerilme, X-ray diffraction