Effect of time and temperature on microstructure and mechanical properties of an austempered ductile iron, ADI, of composition 3.6 percent C, 2.6 percent Si, 0.4 percent Cu, 0.2 percent Mn are reported. X-ray analysis and microstructural observations indicate that lowering the working temperature, aging temperature, increases the lifetime of ADI significantly. Results show that lowering the aging temperature increases the strength and reduces the ductility of ADI. DSC traces for ADI austempered at 340 deg C arc presented. Comparison of the DSC analysis and kinetic measurements demonstrates that the DSC traces can be used to predict the life time of ADI successfully.
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