J. Phys. IV France 09 (1999) Pr9-401-Pr9-409
Phase transformations in low-carbon steels ; modelling the kinetics in terms of the interface mobilityY. van Leeuwen, T.A. Kop, J. Sietsma and S. van der Zwaag
Laboratory of Materials Science, Rotterdamseweg 137, 2628 AL Delft, The Netherlands
The mechanical properties of steel are determined by the microstructure that develops during the production process and is a joint result of effects of chemical composition and of heat treatment. This paper deals with the kinetics of the phase transformation between the high temperature FCC-phase austenite and the low temperature BCC-phase ferrite as it occurs during controlled cooling. In order to predict the transformation kinetics, a physical model has been developed that considers both composition effects and the actual lattice transformation rate. The model is verified against experimental dilatometry data for three lean carbon-manganese steel grades. Notwithstanding the model having no adjustable parameters, it yields adequate simulations of the transformation kinetics.
© EDP Sciences 1999