Determination of flow stress under hot deformation conditions

In order to predict the flow stress curves up to peak under the hot working conditions two crucially modified models are presented. The modification is done by considering the effects of both temperature and strain rate. Besides, the ability of prediction at very low strains is added to them. Furthermore a new mathematical model has been developed to estimate the stress–strain curves beyond the peak via a secant hyperbolic function. The predicted results are found to be in accord with empirical values.