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<p>Compared with conventional steel, austenitic lightweight steels are of significant interest because of their remarkable density reduction advantages and excellent comprehensive properties. In this work, the tensile properties, tensile deformation behavior and strengthening mechanism of aged Fe−28Mn–10Al–1C–3Cu austenitic lightweight steel were investigated via uniaxial tensile tests, electron backscattered diffraction and high-resolution transmission electron microscopy. The research results indicate that the steel achieved an excellent strength-ductility balance, with high ultimate tensile strength (1026.7&#xa0;MPa), high total elongation (43.1%) and high yield strength (926.4&#xa0;MPa). The microstructure observations revealed that as the strain increased, the local strain and dislocation density continued to increase. Dislocations accumulate mainly at grain boundaries. During tensile deformation, the deformation microstructure of steel exhibited planar glide characteristics, and its deformation strengthening mechanism was microband-induced plasticity. In addition, the excellent mechanical properties of steel are related to the coprecipitation of nanosized Cu-rich precipitates and κ-carbide precipitates.</p>

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Tensile Deformation Behavior of Fe–28Mn–10Al–1C–3Cu Austenitic Lightweight Steel with Excellent Strength-Ductility Balance

  • 期刊论文

  • 发表日期：

    2025年2月3日

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  • Xiqiang Ren,
  • Yanfei Qi,
  • Yungang Li,
  • Jiahao Gu

摘要

Compared with conventional steel, austenitic lightweight steels are of significant interest because of their remarkable density reduction advantages and excellent comprehensive properties. In this work, the tensile properties, tensile deformation behavior and strengthening mechanism of aged Fe−28Mn–10Al–1C–3Cu austenitic lightweight steel were investigated via uniaxial tensile tests, electron backscattered diffraction and high-resolution transmission electron microscopy. The research results indicate that the steel achieved an excellent strength-ductility balance, with high ultimate tensile strength (1026.7 MPa), high total elongation (43.1%) and high yield strength (926.4 MPa). The microstructure observations revealed that as the strain increased, the local strain and dislocation density continued to increase. Dislocations accumulate mainly at grain boundaries. During tensile deformation, the deformation microstructure of steel exhibited planar glide characteristics, and its deformation strengthening mechanism was microband-induced plasticity. In addition, the excellent mechanical properties of steel are related to the coprecipitation of nanosized Cu-rich precipitates and κ-carbide precipitates.