Model describing flow stress by means of structural processes and internal state of materials

The main aim of the paper is elaboration of model describing changes of flow stress of silicon bronzes and copper during plastic deformation. The elaborated model makes it possible not only to determine flow stress in a wide range of strain rate (0.01-10 s -1 ) and temperature (293-1073 K) variability but to take into account the deformation rate history for a whole group of materials such as silicon bronzes with different chemical compositions containing below 6% silicon. Very good correlation between experimental and calculated values was obtained in the whole above mentioned range of temperatures and strain rates with relative errors less then ±5%. Elaborated model except the factors present in the early models contains parameters describing the effect of separated structural phenomena on flow stress. The model can be used for optimum design of metal forming processes of silicon bronze from the point of view of efficiency of processes and good quality of products.