Abstract
A new method of determining the softening ratio X was evaluated by comparing stress‐strain curves over the yield point. A widely executed experimental program on the computer‐controlled torsion plastometer allowed us to provide the mathematical description of the X‐value as a function of the deformation temperature T and time t between deformations, temperature of austenitization Ta, strain e and strain rate ∊̇ of the previous pass, respectively. The picture in words refers to a microalloyed steel base of C–Mn–Mo–Nb–V which is recovered in the temperature range from 700 to 900°C.
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