Hot rolling simulations of austenitic stainless steel

The dynamic, static and metadynamic recrystallization behavior of austeniti c stainless steel during hot rolling was analyzed. In this approach, each o f those recrystallization behaviors is described by appropriate kinetics eq uations. The critical strain for dynamic recrystallization was determined s o that a distinction could be made between static and metadynamic recrystal lization; then the amounts of strain accumulation compared with the critica l strain each pass. The effects of grain size on the fraction recrystallize d and of the latter on the flow stress were evaluated for each type recryst allization behavior. In this way, the dependence of the mean flow stress (M FS) on temperature could be analyzed in terms of the extent and nature of t he prior or concurrent recrystallization mechanisms. Finally, an example is given of an industrial process in which DRX/MDRX can play an important rol e. More grain refinement can be achieved by increasing the strain rate, dec reasing the interruption time and lowering the temperature of deformation. (C) 2001 Kluwer Academic Publishers.