Effect of 2.3 Cr% and Austempering parameters on properties of Carbidic Austempered Ductile Iron (CADI)

The objective of the present research work is to improve the wear resistance by addition 2.3% of chromium in ductile iron and examined other properties of carbidic austempered Ductile Iron (CADI) with changing austempering parameters. Two variants of CADI were austenized at 975°C temperature for the period of 1hr, quenched in salt bath at 325°C austempered temperature for the period of 2hr, 4hr respectively. The hardness of these two variants is between 44 to 46 HRc. Scanning electron microscope shows images of CADI variants at 5000X magnification and microstructure images at 500X magnification. The X-Ray diffractometer graph shows the peak value of austenite, ferrite, iron carbide, chromium iron carbide. The wear resistance was evaluated in accordance with ASTMG99 standard. It concluded that CE and chromium content increases in CADI, the volume fraction of carbides is increases which attribute to wear resistance will be more.