Prediction of Flow Stress at 10~3/s for an Ultra Low Carbon Steel by the Kocks-Mecking Model

摘要

It is not easy to measure flow stress at a high strain rate precisely. Because plastic deformation of metals and alloys at 10~3/s at a low temperature is controlled by thermal activation mechanisms for dislocation motion, the flow stress at a high strain rate must be predictable from the accurate data obtained by tensile test with low strain rates. Tsuchida et al. have applied the Kocks-Mecking (KM) model to a hot Ti alloy and a fcc US310S steel and obtained excellent results. In this report, we examine the application of the KM model to a bcc low carbon steel and compare the simulated results with measured flow curves at 10~3/s.