Prediction of Flow Behavior during Warm Working

Abstract

In this work, the effects of dynamic strain aging and dynamic recovery on metal flow during warm working are studied. Compression experiments are utilized to assess the flow behavior of a low carbon steel under warm deformation conditions. Then, a two dimensional finite element routine is coupled with dynamic recovery and dynamic strain aging models. In this way, the temperature and the velocity fields are predicted during warm working operations with regard to the effects of dynamic recovery and dynamic strain aging. Warm rolling tests are performed in order to verify the modelling results. Comparison between the predicted and measured roll forces shows reliability of the employed model. KEY WORDS: warm rolling; dynamic strain aging; dynamic recovery; finite element analysis.

Flow Stress Constitutive Model of Ultra Low Carbon Steel in Warm Deformation

“…The flow stress variation in two phase region is the comprehensive result of temperature effect and transformation effect. The particular variation rule of flow stress with temperature in two phases region is similar to the results of other researches, [3][4][5][6] but these research works didn't give the flow stress constitutive model suitable to deformation condition in two phases region. The existing flow stress equations used to describe the flow stress in austenite range cannot be used in the condition of ferrite deformation because the influence rules of temperature on flow stress are different in two deformation conditions.…”