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<p>On the basis of 2100&#xa0;MPa ultra-high-strength bridge cable steel wire designed by our research group in the early stage, we further understand the change of the performance of the steel wire after hot dipping, which paves the way for the optimization of the hot dipping process and the development of higher-strength steel wire. Cold-drawn wires (5.9 and 7.0&#xa0;mm in diameter) underwent controlled thermal exposures in a salt bath furnace simulating industrial hot dipping conditions (440–460&#xa0;°C, 10–300 s), followed by multi-scale characterization combining tensile testing, scanning electron microscope and transmission electron microscope, and three-dimensional atom probe tomography. The results revealed a critical time-dependent competition between strengthening and softening mechanisms: short-duration treatments (≤ 30 s) enhanced strength through cementite dissolution and carbon supersaturation in ferrite, while prolonged exposures (&gt; 60s ) degraded performance through lamellar spacing coarsening and dislocation annihilation. It is worth noting that the peak strength is ahead of the elongation in time to meet the standard requirements, which indicates that the process window should be optimized by the hot dipping process. Experiments and kinetic analysis determined that 30−60s was the best processing time, and the balance performance was achieved by controlling the dissolution of cementite.</p>

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Influence of hot dipping on cementite dissolution, microstructural evolution, and mechanical properties of cold-drawn steel wire for large span suspension bridge cables

  • 期刊论文

  • 发表日期：

    2026年4月15日

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  • Pan Cai,
  • Cheng-Yang Hu,
  • Jia-Lin Li,
  • Xiao-Xiong Zhu,
  • Jie Zhou,
  • Lin Cheng,
  • Hua-Juan Xue,
  • Jun Zhao,
  • Kai-Ming Wu

摘要

On the basis of 2100 MPa ultra-high-strength bridge cable steel wire designed by our research group in the early stage, we further understand the change of the performance of the steel wire after hot dipping, which paves the way for the optimization of the hot dipping process and the development of higher-strength steel wire. Cold-drawn wires (5.9 and 7.0 mm in diameter) underwent controlled thermal exposures in a salt bath furnace simulating industrial hot dipping conditions (440–460 °C, 10–300 s), followed by multi-scale characterization combining tensile testing, scanning electron microscope and transmission electron microscope, and three-dimensional atom probe tomography. The results revealed a critical time-dependent competition between strengthening and softening mechanisms: short-duration treatments (≤ 30 s) enhanced strength through cementite dissolution and carbon supersaturation in ferrite, while prolonged exposures (> 60s ) degraded performance through lamellar spacing coarsening and dislocation annihilation. It is worth noting that the peak strength is ahead of the elongation in time to meet the standard requirements, which indicates that the process window should be optimized by the hot dipping process. Experiments and kinetic analysis determined that 30−60s was the best processing time, and the balance performance was achieved by controlling the dissolution of cementite.