High Strain Rate Dynamic Deformation of ADI

Abstract

Engineering materials used in numerous applications, particularly in automotive crash loading and military ballistic purposes have to meet new demands, one of which is the resistance to dynamic loading. As the phenomena associated with such interaction is rather complex, non-static types of tests are applied to evaluate and compare between different potential materials. In this Work, different grades of ADI were produced under different austenitizing and austempering conditions different ausferrite morphologies. The effect of alloying elements such as Cu and Mo on the initial microstructure of the ductile iron was also studied. The initial amount of retained austenite was subjected to different dynamic strain rates. The hardness and strain induced martensitic transformation as a function of the microstructure and strain rate were evaluated. Extensive use of XRD and SEM was made to evaluate the high strain rate properties of the investigated grades.

Archives of Metallurgy and Materials

“…The solubility of carbon from graphite nodules also increases with temperature. Austenite becomes more homogeneous and its grains grow more [4,9,14]. However, the final shaping of the structure occurs during the next step of heat treatment -the austempering.…”