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<p>This study compared the mechanical properties of cold-drawn bainitic and pearlitic wires, revealing the strengthening mechanism of bainite wires in the low-strain region. Scanning electron microscopy and transmission electron microscopy characterizations revealed that the bainitic wire possessed finer initial grains and nanoscale interlamellar spacing, resulting in an initial strength of 1761&#xa0;MPa, significantly higher than the 1440&#xa0;MPa of the pearlitic wire. The draw hardening of the bainitic wire proceeded through three stages: grain orientation, microstructural refinement, and cementite decomposition and dislocation saturation. Within the low to moderate strain range (<i>ε</i> &lt; 3), the bainitic wire exhibited a superior hardening rate compared to the pearlitic wire. This resulted in the tensile strength of the bainitic wire exceeding 4722&#xa0;MPa as the drawing strain increased to 4.8. These results demonstrate that bainitic wire can achieve strength comparable to that of the pearlitic wire (4741&#xa0;MPa) with fewer processing steps, thus showing promising prospects for critical low- to medium-strain steel wire applications. This study clarifies the strengthening mechanism of bainite structure under deformation, which provides a basis for the practical application of bainite structure in high-performance engineering fields such as bridge cables or mining support structures.</p>

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Cold Drawing-Induced Strength Enhancement of Micro-Alloyed Bainitic Steel Wire: A Comparative Study with Pearlitic Steel

  • 期刊论文

  • 发表日期：

    2025年10月28日

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  • Yu Wang,
  • Xuegang Min,
  • Xianjun Hu,
  • Yan Xu,
  • Lichu Zhou,
  • Xuefeng Zhou,
  • Zonghan Xie,
  • Feng Fang

摘要

This study compared the mechanical properties of cold-drawn bainitic and pearlitic wires, revealing the strengthening mechanism of bainite wires in the low-strain region. Scanning electron microscopy and transmission electron microscopy characterizations revealed that the bainitic wire possessed finer initial grains and nanoscale interlamellar spacing, resulting in an initial strength of 1761 MPa, significantly higher than the 1440 MPa of the pearlitic wire. The draw hardening of the bainitic wire proceeded through three stages: grain orientation, microstructural refinement, and cementite decomposition and dislocation saturation. Within the low to moderate strain range (ε < 3), the bainitic wire exhibited a superior hardening rate compared to the pearlitic wire. This resulted in the tensile strength of the bainitic wire exceeding 4722 MPa as the drawing strain increased to 4.8. These results demonstrate that bainitic wire can achieve strength comparable to that of the pearlitic wire (4741 MPa) with fewer processing steps, thus showing promising prospects for critical low- to medium-strain steel wire applications. This study clarifies the strengthening mechanism of bainite structure under deformation, which provides a basis for the practical application of bainite structure in high-performance engineering fields such as bridge cables or mining support structures.