Abstract
Superplastic steels with high elongation above 300% are expected to be used to manufacture complex-shaped mechanical parts without joining. However, their practical application is difficult due to high energy consumption and low productivity caused by high deformation temperature and low strain rate. In the present study, we newly developed an Fe-Mn-Si-Ni steel, which exhibited superplasticity at a low temperature of 1023 K and a high strain rate of 1 × 10−1 s−1. This steel also had remarkable room-temperature tensile strength (∼1.3 GPa) and total elongation (38%) after a simulation of superplastic forming. The mechanism of excellent superplasticity is grain boundary sliding occurring at the boundaries of fine γ grains, whose coarsening was suppressed by both Fe5(Mn,Ni)3Si2 and (Fe,Mn,Ni)3Si precipitates.
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