Abstract
This study reports the evolution of strain rate sensitivity (SRS) a novel 3.6Al Medium Mn steel (MMS) with an ultrafine equiaxed dual-phase structure. By varying temperature and strain rate, a new bidirectional reciprocating strain rate jump experiment was conducted to evaluate the effect of strain rate on the SRS index m. Tensile tests were conducted at high-temperature deformation to obtain the maximum m-value, and microstructure were characterized. The results demonstrate that at temperatures ranging from 700 °C to 750 °C and strain rates from 2.5 × 10−4 to 1.6 × 10−2 s−1, the m-value decreases monotonously with increasing strain rate, and the decreasing trend slows down. During high-temperature deformation, the m-value is more sensitive to changes in strain rate. At 700 °C, the grain refinement increases the m-value with the increase in strain. Interestingly, MMS exhibited new γ fiber and brass texture during deformation at 750 °C, with a larger m-value and better superplasticity (∼1295%).
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