Effect of composition and heat treatment parameters on the characteristics of austempered ductile irons

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Abstract
The discovery of Ductile Iron (DI) in 1948 provided new growth markets to the iron foundry industry. Precipitating the graphite phase as nodules in a continuous “pseudo-steel” matrix provided the mechanical strength and impact toughness lacking in gray cast irons. This new class of engineering materials was well suited to replace steel castings, forgings and assemblies, resulting in a North American production level exceeding four million tons (including pipe) of DI in 1995. This market growth was concurrent with the development of a family of materials which found applications in most industrial fields.Austempered Ductile Irons (ADI) are the most recently developed materials of the DI family. By adapting the austempering treatment initially introduced for steels to DI, it has been shown that the resulting metallurgical structures provide properties that favorably compare to those of steel while taking advantage of a near-net-shape manufacturing process. The objectives of this paper are to review...

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