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<p>Uniaxial tensile tests were conducted on cold-rolled non-oriented silicon steel Fe-2.5%Si at room temperature using a universal testing machine, with strain rates of 2.38 × 10<sup>–5</sup>, 2.38 × 10<sup>–4</sup>, 2.38 × 10<sup>–3</sup>, and 2.38 × 10<sup>–2</sup> /s, parallel (RD) and perpendicular (TD) to the rolling direction. Results show the material undergoes elastic deformation, uniform plastic deformation, instability, and fracture. Increasing strain rates significantly enhances yield and tensile strength, indicating strain rate sensitivity. At the same strain rate, tensile strength is higher in the TD direction, showing slight anisotropy. Fracture surface analysis reveals a transition from ductile to brittle fracture with increasing strain rates. The Fields–Backofen constitutive equation for low strain rates and the Johnson–Cook constitutive equation for medium to high strain rates were established. Fields–Backofen model predictions showed maximum relative errors of 11.96% (RD) and 10.99% (TD), with average errors of 1.43% and 0.89%, respectively. Johnson–Cook model predictions had maximum errors of 12.91% (RD) and 7.81% (TD), with average errors of 2.20% and 2.36%. These models provide a basis for numerical simulation and process optimization of Fe-2.5%Si.</p>

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Tensile deformation behavior and constitutive modeling of cold-rolled non-oriented silicon steel with 2.5 wt% Si

  • 期刊论文

  • 发表日期：

    2025年1月16日

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  • Su Pei,
  • Ruibin Mei,
  • Li Bao,
  • Lihao Chen,
  • Guanglin Li,
  • Xianghua Liu

摘要

Uniaxial tensile tests were conducted on cold-rolled non-oriented silicon steel Fe-2.5%Si at room temperature using a universal testing machine, with strain rates of 2.38 × 10–5, 2.38 × 10–4, 2.38 × 10–3, and 2.38 × 10–2 /s, parallel (RD) and perpendicular (TD) to the rolling direction. Results show the material undergoes elastic deformation, uniform plastic deformation, instability, and fracture. Increasing strain rates significantly enhances yield and tensile strength, indicating strain rate sensitivity. At the same strain rate, tensile strength is higher in the TD direction, showing slight anisotropy. Fracture surface analysis reveals a transition from ductile to brittle fracture with increasing strain rates. The Fields–Backofen constitutive equation for low strain rates and the Johnson–Cook constitutive equation for medium to high strain rates were established. Fields–Backofen model predictions showed maximum relative errors of 11.96% (RD) and 10.99% (TD), with average errors of 1.43% and 0.89%, respectively. Johnson–Cook model predictions had maximum errors of 12.91% (RD) and 7.81% (TD), with average errors of 2.20% and 2.36%. These models provide a basis for numerical simulation and process optimization of Fe-2.5%Si.