Austemperability of Intercritically Austempered Ductile Iron (IADI)

By: R. Aristizabal, K. Hayrynen, R. Foley, J. Griffin, C. Monroe

Publication Date: February 12, 2015

Contact: Cindy Duman

Document Type: White Papers


This project focused on understanding the properties and austemperability limits that can be obtained in intercritically austenitized, austempered ductile iron (IADI). The austenitization temperature in IADI is lower when compared to conventional austempered ductile iron (ADI). The iron is
austenitized in the intercritical range and the matrix consists of a combination of proeutectoid ferrite and ausferrite. IADI has nearly twice the yield strength and similar elongation as ferritic ductile iron.

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