오스템퍼드 구상흑연주철의 기계적 성질과 감쇠능의 관계

Abstract

This study was carried out to investigate the relationship of tensile properties and damping capacity in austempered ductile cast iron. The results obtained from this study are as follow . Tensile strength an elongation of ductile cast iron increased by austempering treatment, but strength and elongation decreased with on increase of austempering temperature. Damping capacity of ductile cast iron decreased by austempering treatment, and damping capacity was affected by austempering temperature. Mechanical properties of austempered ductile cast iron was controlled by bainite and retained austenite structure, but damping capacity was controlled by transformation from ferrite to bainite. Damping capacity un-changed with increasing of tensile strength and elongation. Thus, there was no propertional relationship between damping capacity and strength, elongation in austempered ductile cast iron.