Abstract
Adding light elements such as Mn and Al to steels can significantly reduce the density and obtain good strength-ductility of steels, making it a suitable choice for the development of lightweight materials. In this study, the microstructure and mechanical properties of Fe-30Mn-10Al-1C low density steel after cold rolling and annealing heat treatment were investigated. The results demonstrated that nano-sized κ-carbides are unevenly precipitated during the low temperature (500 °C) annealing process, which pin austenite grain boundaries and restrain the growth of austenite grains during the subsequent high temperature (900 °C) annealing process. As a consequence, the two-step annealed sample exhibits a fine and heterogeneous grain structure, leading to improvements of approximately 30 MPa in the yield strength to 752 MPa while keeping almost the same uniform elongation. Compared to the one step annealed sample (900 °C annealed for 3 minutes), the two-step annealed sample can achieve a high strength-ductility product (58 GPa·%) and an excellent impact toughness (128 J/cm2 at -40 °C).
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