EVOLUTION OF THE MICROSTRUCTURE IN THE PROCESSES OF HOT COMPRESSION AND DRAWING-ROLLING

The paper deals with the problem of the prediction of the microstructu re evolution during the hot deformation of carbon-manganese steels. Th e objective of the work is the validation of the approach which incorp orates an advanced thermal-mechanical finite-element model with the co nventional closed form equations describing processes of static recrys tallization and grain growth. Two types of the experiments are perform ed. The first is a typical multistage hot compression test for the axi symmetrical samples. The second is hot drawing of the flat samples thr ough a set of the roller dies. An influence of initial grain size, sta rting temperature, strains and interpass times is investigated. The re sults include validation of various equations describing austenite gra in size and kinetics of static recrystallization for the carbon-mangan ese steels.