Abstract
This paper reports the framework of a computer model that calculates the precipitation kinetics of MX type carbides or carbonitrides from austenite matrix in microalloyed steels during hot rolling. The kinetic model is based on the classical Johnson-Mehl-Avrami theory adapted to include the saturation of nucleation sites. The effect of deformation on precipitation kinetics is quantitatively described through its effect on flow stress, from which the number of potential nucleation sites can be estimated. The time-temperature precipitation diagram can then be calculated for a given alloy chemistry and deformation conditions. A preliminary study has been carried out to test its performance in both undeformed and deformed conditions.
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