Modelling anisothermal recrystallisation in austenitic stainless steels

G. J. Hopkin and H. K. D. H. Bhadeshia


The kinetics of recrystallisation have in the past been represented using the classical Avrami theory. Some authors have used the theory empirically whereas others have incorporated proper nucleation and growth functions into the Avrami equation. In developing such models, it has commonly been assumed that there is in an initial number density of nuclei which begin growth at the instant the material reaches the isothermal heat treatment temperature. The exponent n in the Avrami equation is then obtained by fitting to experimental data. We present here an Avrami representation of recrystallisation kinetics which avoids this procedure and takes account of the nature of the nucleation sites. This allows a meaningful interpretation of the Avrami exponent; the theory is then adapted to anisothermal kinetics using the Scheil rule.

21st Riso International Symposium on Materials Science, eds N. Hansen, X. Huang, D. Juul Jensen, E. M. Lauridsen, T. Leffers, W. Pantleon, T. J. Sabin and J. A. Wert, published by Riso National Laboratory, Denmark, 2000, pp. 353-358.

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