Flow behavior of Fe-3Si steel at high temperatures and strain rates

摘要

Hot deformation behavior of Fe-3%Si steel within temperature range of 1073~1473K and strain rate range of 0.01~5s~(-1) was investigated by isothermal compression test using thermo-simulation method. Over the applied deformation conditions, steady state flow behavior was well described by the power law relationship with dislocation climb as the rate-controlling mechanism, and the high apparent activation energy can be attributed to the high yield stress. A modified Bergstr?m model was proposed by introducing yield stress, and consequently the whole stress-strain curves can be accurately predicted.