Deformation mechanism transition in Fe-17Mn-0.4C-0.06V TWIP steel with different strain rates

摘要

The dynamic tensile behaviour and deformation mechanism of the Fe-17Mn-0.4C-0.06V twinning-induced plasticity (TWIP) steel were investigated over a wide range of strain rates from 10(-4) to 10(3) s(-1). With increasing strain rate, the stacking fault energy increased due to the increase of adiabatic heating temperature, Delta T. At 10(-4) to 10(1) s(-1), the transformation-induced plasticity (TRIP) effect coexisted with the TWIP effect and weakened with increasing strain rate. With the increase of strain rate in the range of 10(-1) to 101 s(-1), the TWIP effect strengthened gradually and intersected deformation twins were formed. When the strain rate was higher than 10(1) s(-1), the TRIP effect disappeared and the twinning was inhibited since the adiabatic heating effect elevated.