International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

A non-equilibrium thermodynamic model of the austenite non-diffusion transformation in iron and alloys based on it is developed, taking into account internal stresses in the system. Onsager motion equations are found for a model thermodynamic system describing a non-diffusion transformation and kinetic equations for changing deformations and growth rates of the α-phase. A scheme of austenitic non-diffusion transformations is constructed, including normal and martensitic transformations, as limiting cases.

The studies are represented of phase and structure transformations during the process of multi-stage heat treatment of large-scale rolls. Adapted analytical models are introduced and applied to the calculation of phase transformations together with the finiteelement models of rolls. The results show phase components distribution over the hardened layer of rolls of the special alloy steels 50CrMnMoV and 45Cr3MnNiMoV at different stages of the manufacturing process.

The non-equilibrium thermodynamics analysis of the eutectoid transformation is executed into carbon steel. Onsager’s equations of motion are built for the model thermodynamics system describing eutectoid transformation. Dependences of basic kinetic pa-rameters of process are expected are speeds of height of pearlite and inter-plates distance from the size of subcooling became for the sta-tionary process of eutectoid transformation.