Abstract
During hot metal working, strain, strain rate, temperature, microstructure and chemistry along with associated metallurgical phenomena such as strain hardening, dynamic recovery and recrystallization are known to have a significant effect on the flow stress of the metal. Simple flow stress models such as the power law were found to be inadequate for the accurate prediction of leads and metal flow using numerical simulation. In this study, a microstructure dependent flow stress model was developed by performing uniaxial compression tests on the Gleeble test machine. This model was implemented, using a computationally efficient procedure, into the finite element method based metal flow simulation model for hot rolling. Reasonably good agreements were obtained in comparing predicted rolling loads and rod geometry with those measured on a multi-pass production mill.
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