Fatigue Properties of Austempered Ductile Iron in Dependence on Transformation Temperature
Keywords:austempered ductile iron, isothermal transformation, fatigue behaviour, stabilized austenite
Austempered ductile iron (ADI) belongs to structural materials with continuously increasing level of production. Using various conditions of heat treatment, its properties can be changed in rather wide extend according to the purpose of ADI application. The aim of the paper consists in a study of interrelations among the conditions of isothermal transformation, resulting structure of ADI matrix and its static as well as fatigue behaviour. The transformation temperature was changed in the range from 380 °C to 500 °C and fatigue properties of obtained structure were studied in detail determining S-N curves in high-cycle region. Static mechanical properties were compared with fatigue limits obtained by the fit of the whole S-N curves and with the content of stabilized austenite. Optimum fatigue properties were obtained for transformation temperature of 400 °C when ADI matrix obtained the highest content of stabilized austenite.
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