MATHEMATICAL MODELLING AND PHYSICAL SIMULATION OF THE HOT PLASTIC DEFORMATION AND RECRYSTALLIZATION OF STEEL WITH MICRO-ADDITIVES

摘要

This paper deals with the possibility of optimizing the parameters for a thermomechanical treatment of structural steel with micro-additives, particularly in the processes of the controlled rolling of economical profiles type [240E by means of mathematical modelling of the flow stress (sigma(p)) and the physical simulation of this process based on the results of investigations obtained by plastometric hot-torsion tests. In the description of the flow stress the rheological model suggested by C. M. Sellars is applied in the paper, in the form sigma(p) = f(epsilon,(epsilon)over dot,T). Based on this model, the cause of the experimental and theoretical flow stress-strain curves was verified, applying the minimum of the goal function in order to determine most accurately the matching of the analysed curves of the investigated steels. It was found that the applied rheological model achieves a good matching of the experimental and theoretical curves, whereas a physical simulation permits a complementary verification of the optimal parameters of the controlled rolling of the manufactured products.