Microalloying elements Ti, Nb, V, entered into steel they influence their microstructure and mechanical properties, because formation of carbonitrides, M (C, N), which in the high temperature inhibit the austenite grains growth and during the cooling of the austenite form fine precipitates giving the dispersion precipitation effect in ferrite. Influence of carbonitrides to the microstructure and mechanical properties depends on their basic stereological parameters: volume fraction, VV, and their size, r. In this work the model of the kinetics of the carbonitrides precipitation which enable to predict the chemical composition of austenite as well as the size distribution of carbonitrides formed during isothermal annealing of supersaturated steel is presented. The model is based on the Kampmann and Wagner model developed using the classical theory of nucleation. Examples of applications of developed model are presented.Keywords: Cellular automata, precipitation, carbonitrides, microalloying elements, microalloyed steel
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