COMPARISON OF HIGH TEMPERATURE PROPERTIES AND THERMAL SHOCK OF AUSTEMPERED DUCTILE IRONS (ADI) WITH THOSE OF PEARLITIC DUCTILE CAST IRONS

Abstract: Strength at elevated temperatures and thermal shock resistance of austempered ductile irons at high temperatures has been less intentioned, because of instability of ausferrite phase. In this research the tensile properties of this iron and pearlitic ductile cast iron have been investigated by short time high temperature tensile tests. Also thermal shock tests were done at the molten lead bath at ۱۰۰۰ 􀁱C . In these experiments, at first samples were immersed partially in the molten lead bath for ۲۵ seconds and then either cooled in air or quenched in water. Results of short time high temperature tensile and thermal shock tests showed that ADI samples have higher strength and shock resistance than the pearlitic ductile samples.

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Keywords: austempered ductile iron ، thermal shock ، strength.