Paper Title
Effect of Austempering Time on Microstructure and Hardness Properties of CGI

Abstract
Abstract- In the present study, the samples were extracted from as-cast piece and heat treated by austempering under austenitising temperature of 900oC for 60 min, which followed by quenching in salt-bath at 325oC for various austempering time 30, 60, 90 and 120 min. LOM, SEM and EBSD analysis confirmed the resultant ausferritic matrix in heat-treated samples. The Brinell hardness measurements of the ausferrite matrix showed a significant increase in hardness compared to the ferritic CGI. Keywords- CGI, Austempering, Ausferrite matrix, Nanoindentation.