Effect of Heat Treatment Process on Microstructure Properties of Ultra-high-strength 95Si Wire Rod for Bridge Cables

Xu Kai; Liu Jinyuan; Cheng Ran; Li Yang; Yan Chaonan; Chen Dianqing; Gao Yongbin; Zuo Jinzhong; Zhang Chaolei

doi:10.20057/j.1003-8620.N250508

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Effect of Heat Treatment Process on Microstructure Properties of Ultra-high-strength 95Si Wire Rod for Bridge Cables

Forming and Phase Transition | 更新时间：2025-11-06

- Effect of Heat Treatment Process on Microstructure Properties of Ultra-high-strength 95Si Wire Rod for Bridge Cables
- Special Steel Vol. 46, Issue 6, Pages: 149-153(2025)
- 作者机构：
  
  1.青岛特殊钢铁有限公司线材研究所，青岛 266000
  2.北京科技大学碳中和研究院，北京 100083
- 作者简介：
- 基金信息：
- DOI：10.20057/j.1003-8620.N250508
  CLC： TG161
- Received：26 July 2025，
  
  Revised：2025-08-26，
  
  Accepted：27 August 2025，
  
  Published：30 November 2025
- 稿件说明：
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徐凯,刘晋源,程冉等.热处理工艺对桥梁缆索用超高强度95Si盘条组织性能影响[J].特殊钢,2025,46(06):149-153.

Xu Kai,Liu Jinyuan,Cheng Ran,et al.Effect of Heat Treatment Process on Microstructure Properties of Ultra-high-strength 95Si Wire Rod for Bridge Cables[J].Special Steel,2025,46(06):149-153.
徐凯,刘晋源,程冉等.热处理工艺对桥梁缆索用超高强度95Si盘条组织性能影响[J].特殊钢,2025,46(06):149-153. DOI： 10.20057/j.1003-8620.N250508.

Xu Kai,Liu Jinyuan,Cheng Ran,et al.Effect of Heat Treatment Process on Microstructure Properties of Ultra-high-strength 95Si Wire Rod for Bridge Cables[J].Special Steel,2025,46(06):149-153. DOI： 10.20057/j.1003-8620.N250508.

摘要

为探究在线热处理工艺对桥梁缆索用超高强度95Si高碳盘条微观组织及性能的影响，分别在530、550、570 ℃盐浴温度下对盘条进行热处理，通过力学性能测试、显微组织表征等，研究了盐浴温度对珠光体片层间距、球团尺寸等微观组织特征及强塑性影响规律。结果表明，随温度升高，珠光体片层间距从530 ℃时的74 nm增至570 ℃时的141nm，球团尺寸从2.4 μm增至3.4 μm，珠光体节尺寸从20.3 μm增至23.6 μm，且大角度晶界占比逐渐降低；与此对应，盘条的抗拉强度从1 491 MPa降至1 374 MPa，断面收缩率从38.8%降至35.0%。盘条在530 ℃下达到最佳力学性能，即具有1 491 MPa的抗拉强度和38.8%的断面收缩率。可见盐浴温度主要影响盘条片层间距和球团尺寸从而改善其强塑性，在530 ℃盐浴温度下，细化的片层间距与球团使其具有较高的大角度晶界数量与位错密度，从而实现了强度提升，同时，借助大角度晶界对裂纹扩展的阻碍作用改善塑性。

Abstract

To investigate the influence of online he at treatment process on the microstructure and properties of 95Si high-carbon wire rods for bridge cables， the wire rods were heat-treated in salt baths at 530 ℃， 550 ℃ and 570 ℃ respectively. Through mechanical property tests and microstructure characterization， the effects law of salt bath temperature on the microstructure characteristics such as pearlite lamellar spacing and globular size， as well as the strength and plasticity were studied. The results show that with the increase of temperature， the pearlite lamellar spacing increases from 74nm at 530 ℃ to 141nm at 570 ℃， the globular size increases from 2.4 μm to 3.4 μm， and the pearlite node size increases from 20.3 μm to 23.6 μm. Meanwhile the proportion of high-angle grain boundaries gradually decreases. Correspondingly the tensile strength of the wire rods decreases from 1 491 MPa to 1 374 MPa， and the reduction of area decreases from 38.8% to 35.0%. The wire rods achieve the best mechanical properties at 530 ℃， with a tensile strength of 1 491 MPa and a reduction of area of 38.8%. It can be seen that the salt bath temperature mainly affects the lamellar spacing and globular size of the wire rods， thereby improving their strength and plasticity. At 530 ℃ salt bath temperature， the refined lamellar spacing and globular size result in a higher number of high-angle grain boundaries and dislocation density， thus achieving strength enhancement. At the same time， the plasticity is improved by the hindrance effect of high-angle grain boundaries on crack propagation.

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