Tensile flow stress of non-oriented Fe-3.3%Si steel at a wide range of moderate temperatures

Abstract

The flow stress behavior of hot-rolled Fe-3.3%Si steel was studied through single-pass warm tensile experiments within the temperature range of 250 to 700 °C and strain rate range of 0.001 s^-1 to 0.1 s^-1. The peak stress decreased linearly, but the elongation increased exponentially, with an increase in temperature. Work hardening behavior was obvious, and the non-uniform plastic deformation stage was shorter at lower temperatures, and accordingly the grains were elongated. A novel method was proposed to describe the tensile flow stress of Fe-3.3%Si steel at wide moderate temperatures, and the flow behavior of Fe-3.3%Si was described as the function of temperature, strain and strain rate. The capability of the model to predict tensile flow stress was investigated and the predicted results were in good agreement with measured values. Therefore, the model is reliable and helpful for the optimization of deformation parameters in warm processing.