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<p>This study explores the correlation between variations in microstructure and the physical characteristics of two lightweight high-strength (LHS) Fe-18Mn-8Al-1C (LHS-0Ni) and Fe-18Mn-10Al-1C-5Ni (LHS-5Ni) steels subjected to heat treatment. Microstructural analysis shows that in Ni-free steel, a single-phase austenitic structure formed after annealing. In contrast, lightweight steel with nickel added is formed after an annealing process and is composed of austenitic and B2 phases. This phenomenon can be attributed to the introduction of Ni, which has been demonstrated to encourage the nucleation of the B2 phase (which is enriched with Al and Ni elements). The B2 particles exert a pinning action at the austenite grain boundaries, thereby effectively preventing the process of grain growth and resulting in grain refinement. Mechanical test findings demonstrate that LHS-5Ni has high strength and sufficient ductility compared to LHS-0Ni steel. The tensile strength of the former was measured at 1330 MPa, the yield strength at 1040 MPa, and the elongation at 32.5%. These outstanding properties are chiefly ascribed to the combined influence of grain refinement strengthening and second-phase precipitation strengthening, as well as the synergistic deformation of austenite and B2 phases.</p>

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Effect of Ni Element on Microstructure Evolution and Mechanical Properties of Fe-Mn-Al-C-(Ni) Austenitic Lightweight Steel

  • 期刊论文

  • 发表日期：

    2025年12月2日

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  • H. L. Sun,
  • P. Li,
  • L. Li,
  • H. Ding

摘要

This study explores the correlation between variations in microstructure and the physical characteristics of two lightweight high-strength (LHS) Fe-18Mn-8Al-1C (LHS-0Ni) and Fe-18Mn-10Al-1C-5Ni (LHS-5Ni) steels subjected to heat treatment. Microstructural analysis shows that in Ni-free steel, a single-phase austenitic structure formed after annealing. In contrast, lightweight steel with nickel added is formed after an annealing process and is composed of austenitic and B2 phases. This phenomenon can be attributed to the introduction of Ni, which has been demonstrated to encourage the nucleation of the B2 phase (which is enriched with Al and Ni elements). The B2 particles exert a pinning action at the austenite grain boundaries, thereby effectively preventing the process of grain growth and resulting in grain refinement. Mechanical test findings demonstrate that LHS-5Ni has high strength and sufficient ductility compared to LHS-0Ni steel. The tensile strength of the former was measured at 1330 MPa, the yield strength at 1040 MPa, and the elongation at 32.5%. These outstanding properties are chiefly ascribed to the combined influence of grain refinement strengthening and second-phase precipitation strengthening, as well as the synergistic deformation of austenite and B2 phases.