Influence of Austempering Heat Treatment on Ductile Iron
Abstract
In this present work the influence of austempering heat treatment was studied on ductile iron. Medium frequency induction furnace was used to make casting samples. Austempered Ductile Iron (ADI), which is a relatively new material is produced by the process of austempering heat treatment. ADI material is a very valuable. The properties of ADI are equivalent to forged steel. This study was done to develop Austempered Ductile Iron and to find out the effect of heat treatment temperature. In this study samples were treated, one with higher heat treatment temperature i.e. 370 0C and other in lower range of temperature i.e. 285 oC were used. For austenitizing of samples the furnace temperature was maintained at 900 oC and the samples were heated for one hour. After austenitizing, the samples were dipped in a salt bath at temperatures i.e. 285 oC and 370 oC for one hour. The researcher found encouraging result. Almost double tensile strength was achieved with the same composition of the samples only with the heat treatment at lower temperature.
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