Abstract: With the growing popularity of the green manufacturing concept of “weight reduction, energy saving and carbon emission reduction”, the requirement for upgrading traditional steel materials is particularly urgent. The third generation of automobile steel has become a focus of increasing attention of research and development institutions and enterprises in various countries. As a new research and development direction of the third generation automotive steel, high strength and toughness low-density advanced steel is mainly designed by adding more light elements such as Al, Mn and Si elements into steel, which can significantly reduce the density of steel. The strength and plasticity of steel can be balanced by adjusting matrix structure and precipitated phase composition and morphology, so that it has high strength and plasticity and low density. In the presentation, the lattice parameters and related properties of Kappa carbides, (Fe, Mn) Al, NiAl-type B2 phase, (Fe, Mn)3Al-type DO3 phase and β-Mn phase in low-density steels are introduced according to the composition and structure characteristics of Fe-Al, Fe-Mn-Al and Fe-Mn-Al-C low-density steels. Based on the latest research on low-density steels in China and overseas, the thermal and dynamic calculation of phase diagrams of low-density steels, the elemental partition and precipitation behavior (characteristics, morphology, size), the effect of precipitation on the microstructure evolution and strength-toughness mechanism of steels are summarized. Based on current research, the future research directions of high strength, high toughness and low density steels are prospected.
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