Describing the isothermal bainitic transformation in structural steels by a logistical function

Abstract

A new analytical description for the bainitic transformations in steel on isothermal holding is proposed, on the basis of a logistical function of the holding time (in logarithmic form). The model is characterized by the parameters a and b, which are constant in the given experimental conditions (austenitization temperature, isothermal holding temperature and time, chemical composition of the steel, etc.). The calculated temperature dependence of a and b is in good agreement with experimental data. In further research, the physical significance of coefficients a and b in the logistical function should be refined.