This publication attempts to investigate the effect of heat treatment parameters on the impact strength of ADI. Ductile iron was tempered with isothermal transformation according to two variants. Both variants of heat treatment consisted of two-stage austenitizing. Iron was cured at tA = 9500C, then gradually cooled to a temperature of the supercritical tA'= 850, or 8000C (in the latter variant). Isothermal transformation was carried out under the same conditions. Isothermal hardening was carried out at 300 or 4000C and resisting the time of from 7.5 to 240 min. During these studies, the impact energy of the sample was notched. The results were compared with values given in the standard PN EN 1564 : 2012.Keywords: ADI, impact test, isothermal transformation, austempered parameters
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