Constitutive model for vanadium microalloyed steel under hot working conditions

Hot compression tests were carried out in the temperature range 850-1150degreesC at 0(.)1-60 s(-1) strain rates. The hyperbolic sine equation and neural networks were used to model the constitutive behaviour. Evaluating constitutive parameters n, Q and A using the usual log-log plots does not yield constant values. The n, Q and A values were determined simultaneously using a non-linear optimisation procedure and were fitted as functions of strain. These relations, in conjunction with the hyperbolic sine equation, describe the constitutive behaviour of the steel. A 3: 4: 1 neural network is trained using 75% of the stress-strain data. The network predicts flow stresses and peak strains with good accuracy. Vanadium increases the peak strain, peak stress, and mean flow stress of austenite significantly.