Parametric representation of ttt diagrams of ADI cast iron

Abstract

The method of parametric representation of TTT diagrams on example of selected austempered ductile cast irons is presented. TTT diagrams were digitalised and n,k parameters of Johnson Mehl equation were calculated. The relationships between n,k parameters and transformation temperature were analysed for two ADI irons. Knowledge of these parameters enables to calculate the progress of austenite to bainite transformation.