The mechanical behaviour of ferrite has been studied in the warm working range using compression tests. The goal is to predict the mechanical behaviour of a microalloyed C-Mn steel during ferritic and intercritical roling. The samples have followed different thermomechanical paths in order to vary the microstructure. The influence of these paths on the mechanical behaviour is discussed. It results in different hardening laws, but in identical steady state stress. A short study of the recovery of ferrite is carried out. It is found that for the steel used in this study the time needed for recovery is clearly out of the time range of the industrial process. A constitutive equation of the viscoplatic behaviour of ferrite in the as-received condition is proposed.
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