终冷温度对Q500耐候桥梁钢的低温冲击断裂行为影响

李博文; 高彩茹; 李旺; 王琬淇; 王军; 彭存财; 吴红艳; 高秀华; 杜林秀

doi:10.3724/j.gyjzG24013003

终冷温度对Q500耐候桥梁钢的低温冲击断裂行为影响

doi: 10.3724/j.gyjzG24013003

1. 东北大学轧制技术及连轧自动化国家重点实验室, 沈阳 110819;
2. 南京钢铁股份有限公司, 南京 210044

基金项目:

“十四五”国家重点研发计划项目(2022YFB3706400)。

详细信息

作者简介:
李博文,硕士,主要从事高原复杂环境桥梁钢板制造技术研究。电子信箱:l2494474784@163.com

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出版历程
- 收稿日期: 2024-01-30
- 网络出版日期: 2025-01-08

Effects of Final Cooling Temperature on Low-Temperature Impact Fracture Behavior of Q500 Weathering Bridge Steel

1. State Key Laboratory of Rolling and Automation (RAL), Northeastern University, Shenyang 110819, China;
2. Nanjing Iron and Steel Co., Ltd., Nanjing 210044, China

摘要

摘要: 针对高原复杂环境桥梁建设工程,开发屈服强度500 MPa级别的高抗冲击、韧脆转变温度低的耐候桥梁钢。研究了轧制后终冷温度对试验钢的微观组织和力学性能的影响,深入分析了低温对试验钢冲击韧性的影响。结果表明:经控轧控冷(TMCP)处理后试验钢满足Q500级桥梁钢的力学性能要求,且在-40~-80 ℃的低温环境下,两种不同终冷温度(500、550 ℃)的试验钢均表现出良好的冲击性能。但随终冷温度的升高,试验钢晶粒尺寸增加;马氏体/奥氏体(M/A)岛尺寸增加、形态改变;大角度晶界比例降低是造成两种试验钢冲击性能差异的主要原因。
- 耐候桥梁钢 /
- TMCP /
- 终冷温度 /
- 力学性能 /
- 低温冲击韧性
Abstract: For the bridge construction project in the complex environment of the plateau, the high impact resistance and low tough-brittle transition temperature weathering bridge steel with a yield strength of 500 MPa has been developed. The effects of the final cooling temperature after rolling on the microstructure and mechanical properties of the experimental steels were studied, and the effects of low temperature on the impact toughness of the experimental steels were analyzed in depth. The results showed that the experimental steels after TMCP treatment could meet the mechanical property requirements of Q500 grade bridge steel, and the experimental steels with two different final cooling temperatures (500, 550 ℃) showed good impact properties under the low-temperature environment of -40 to -80 ℃. However, with the increase of final cooling temperature, the grain size of experimental steels increased; the increase of M/A island size and change of morphology and the decrease of the proportion of large-angle grain boundaries were the main reasons for the difference in impact properties of the two experimental steels.
- weathering bridge steel /
- TMCP /
- final cooling temperature /
- mechanical properties /
- low-temperature impact toughness

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