Effect of Processing Parameters on Hardness and Microstructure of Austempered Ductile Iron

Abstract

In the present investigation the effect of copper along with the process variables (austempering temperature and austempering time) on hardness and microstructure of ductile iron is studied. With increasing austempering time hardness is increasing but with increasing austempering temperature it is decreasing. Austempered ductile iron with copper is showing some higher hardness than the austempered ductile iron without copper. In microstructure ferrite is increasing with increasing austempering time and austenite is increasing with increasing austempering temperature in both the grades