AN INVESTIGATION OF RETAINED AUSTENITE CONTENTS IN CARBURIZED SAE 8620 STEEL
In this study, retained austenite contents in carburized SAE 8620 (21NiCrMo2) steel were investigated. Carburizing programs were carried out in gas atmosphere at 940°C. X-ray diffraction was used to determine retained austenite contents in the case-hardened microstructures of the carburized specimens. Test results indicated that maximum retained austenite contents at the microstructures of the carburized specimens that carburized 45 minute, 3 h and 5 h carburizing times at 940°C were 35.8%, 19.4% and 15%, respectively.
Key Words : Carburizing, Retained austenite, X-ray diffraction