Prediction of no-recrystallization temperature by simulation of multi-pass flow stress curves from single-pass curves

In this investigation an algorithm is given to simulate the flow stress curves for multi-pass hot deformation processes simply from the data obtained from single-pass hot torsion test. Using the obtained multi-pass curves the value of no-recrystallization temperature (Tnr) is calculated. This method is examined on a Nb-microalloyed steel. Maximum error in calculation of Tnr with this method and the values obtained from empirical tests was 1.5% which is a very low value. The predicted results are found to be in accord with the experimental data.