Abstract: According to the evolution law of microstructure and properties during the entire hot rolling process of ultra-high strength 92Si wire rod， methods such as mechanical property testing and microstructure characterization were used to analyze the continuous casting billet， samples before intermediate rolling， samples before finishing rolling， and finished wire rod during the hot rolling process. The results showed that with the gradual improvement of strength and plasticity during rolling， the microstructure refinement resulted in a 45% increase in the tensile strength of the finished wire rod compared to the casting billet. From casting billet to finished wire rod， the interlayer spacing has been refined by 76%， and the pellet size has been refined by 78%. During the entire rolling process， the contribution of pearlite interlayer spacing and pellet size to yield strength were 80% and 20%， respectively. The precipitated phases were mainly carbides of Ti and V， and due to the high temperature during the hot rolling process， the some precipitated phases in the middle of the cast billet underwent dissolution and re-precipitation， resulting in a smaller number and size of precipitated phases in the wire rod.

Key words: Bridge Cables, 92Si wire rod, Hot-rolling, Evolution of Microstructure and Properties

摘要： 针对桥梁缆索用超高强92Si盘条全流程热轧过程中组织性能演变规律，采用力学性能检测、微观组织表征等方法分析了热轧过程中连铸坯、中轧前样品、精轧前样品及成品盘条。结果表明：随着轧制进行强塑性逐渐提升，组织细化使得成品盘条相比于铸坯抗拉强度提升了45%。由铸坯到成品盘条，片层间距细化了76%，球团尺寸细化了78%。热轧制全过程中，珠光体片层间距和球团尺寸对屈服强度贡献占比分别为80%和20%。析出相主要为Ti、V的碳化物，而由于轧制过程温度较高，铸坯中部分析出相发生回熔再析出，从而使得盘条中析出相数量及尺寸较小。

关键词: 桥梁缆索, 92Si盘条, 热轧, 组织性能演变