Abstract
Austempered Ductile Iron (ADI) is being used in highly stressed components, particularly in the automotive industry. It therefore becomes essential to understand the factors influencing the ductile and fatigue properties of this material.
In the present paper, to obtain basic data of ADI, dynamic fracture toughness test and static fracture toughness test were conducted. And then X-ray fractographic technique was applied on the fracture surface made by these fracture toughness tests. The plastic zone size was determined from the distribution of the half value and residual stress near the fracture surface. These data obtained in the laboratory tests were used to estimate the dynamic fracture toughness parameter KId at actual fracture of machine parts.
