Abstract
A model of isothermal pearlite reaction kinetics in high-carbon ternary Fe–Cr–C alloys (cast irons) containing (Cr, Fe)7C3 carbide phase is presented. The model is based on traditional Avrami approach completed with a simple type temperature dependence of K coefficient. The model parameters for individual alloys were determined from F. Maratray and R. Usseglio-Nanot’s experimental data covering composition range from 2.1 to 4.3 %C and from 12 to 26 %Cr. The dependence of parameters (Avrami exponent n, activation energy U and time-scale constant C) on gamma phase composition by the end of austenitization (calculated with account for kinetics of carbide dissolution) is determined. The model thus permits to calculate the isothermal pearlite Ccurve (TTT diagram) for an alloy of arbitrary composition after given austenitization regime. The comparison of calculation results to experimental data shows their sufficient correlation.
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