Austempering of Spheroidal Graphite (SG) Cast Iron

Abstract

As the spheroidal shape of graphite can not be fu1ther improved, the subsequent thrust on research and development has, therefore, been towards the modification of the•• matrix structure of ductile iron.

Austempering treatment applied to ductile iron provides a quantum leap in mechanical properties - almost doubling its strength while retaining its toughness. The combination of diverse properties such as strength, toughness, ductility, good machinability and low cost has made austempered ductile iron (ADI) substitute forged steel in many industrial applications.