Kinetics of ¿/a transformation of low-alloy steels

In this thesis, the orthoequilibrium and paraequilibrium are first calculated for a quaternary FeMnSiC system using a sublattice model. The chemical potential functions of the four components (Fe, Mn, Si and C) calculated from the Gibbs molar energy of the two phases ( and ) are then required to calculate the kinetics of the diffusive / -phase transformation of the steel 10MnSi7. A transformation routine based on the sharp interface approximation is then used to solve the coupled problem of finite mobility interfacial motion and C bulk diffusion during phase transformation. For the experimental determination of the diffusive transformation behavior, dilatometer tests are carried out with the thermo-mechanical testing machine Gleeble 3800. For this purpose, the isothermal transformation behavior of the steel is measured at.