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To predict the kinetics of static recrystallization and the resulting grain size in
austenite of alloyed steels including additions of Nb, V, and Ti, a quantitative model is
developed. Physically motivated, the model relates the activation energy of the process with
that of bulk self-diffusion. The known dependence of the latter on the chemical composition
of austenite solid solution, established previously, essentially simplifies the modeling.
Employed empirical parameters have been fitted to relevant data covering a wide range of
chemical compositions (23 steels) and sizes of recrystallized austenite grains. The model
satisfactorily complies with experiments on steels whose apparent activation energy of
recrystallization varies from 146.1 to 308.1 kJ/mol. It is notable as well that this performance
has been achieved with no direct allowance for the pinning of grain boundaries by solute
atoms (solute drag effect).
Keywords: steels, austenite, recrystallization, recovery, precipitation, carbonitrides, kinetics, modeling |
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