Effect of strain rate on microstructures and mechanical properties of Fe–18Cr–8Ni steel

ABSTRACTThe effect of strain rate on deformation microstructures and mechanical properties of Fe–18Cr–8Ni austenitic stainless steel was investigated at strain rates of from 10−3 to 100 s−1. The results indicated that the deformation mechanism of steel changes from transformation induced plasticity (TRIP) to TRIP + twinning induced plasticity (TWIP) effect when the strain rate is increased from 10−3 to 100 s−1. The yield strength of steel increases gradually with strain rate increased, while the tensile strength and elongation first decreases and then increases slowly. The changes in tensile strength and elongation are due to the change of deformation mechanism with the strain rate increased.