Model for phase transitions during heat treatment in eutetoid steel

Steel heat treatments are very important industrial processes which involve microsctructural transformations. In the shop practice the design of these processes is conducted on empirical basis using the so called Bain curves, which cannot describe the phenomenon in its globality. Here, a two dimensional model for an eutectoid steel is proposed which takes into account either diffusive or displacive transformations. The first law of the thermodynamics as well as the dynamic equilibrium equation and an evolution equation for the diffusive phase transformations are involved in the model, together with a description of the internal energy.