回火处理对高强度耐候桥梁钢组织与性能的影响

朱露; 高博; 曹燕光; 李昭东

doi:10.3724/j.gyjzG24042402

回火处理对高强度耐候桥梁钢组织与性能的影响

doi: 10.3724/j.gyjzG24042402

钢铁研究总院有限公司工程用钢研究院, 北京 100081

基金项目:

国家重点研发计划项目资助(2022YFB3706401)。

详细信息

作者简介:
朱露,硕士研究生,主要从事钢的韧性强化机理研究。

通讯作者:
李昭东,正高级工程师,主要从事高性能交通与建筑用钢的基础理论研究与关键技术开发,cisri_lizhaodong@126.com。

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出版历程
- 收稿日期: 2024-04-24
- 网络出版日期: 2025-01-04
- 刊出日期: 2024-12-20

Effects of Tempering Treatment on the Microstructure and Mechanical Properties of High-Strength Weathering Bridge Steel

Institute for Structural Steels, Central Iron & Steel Research Institute Company Limited, Beijing 100081, China

摘要

摘要: 为了研究回火处理对不同显微组织高强度耐候桥梁钢组织演变与力学性能的影响,设计不同轧后冷却返红温度,分别获得以板条状贝氏体(Q470钢)及粒状贝氏体(Q550钢)为主的试验钢。利用物理化学相分析法、X射线衍射仪及万能试验机等表征不同温度回火状态下试验钢显微组织与力学性能演变。结果显示:热轧状态下,Q470钢屈服强度及-40 ℃冲击功均高于Q550钢;回火处理后,Q470钢屈服强度随着回火温度的增加先降低后升高 (665~705 MPa),低温冲击功由300 J逐渐下降至220 J;Q550钢屈服强度随着回火温度的增加逐渐升高 (500~650 MPa),低温冲击功未发生明显变化 (210~230 J)。试验钢的主要强化机制是位错强化和细晶强化。500~650 ℃高温回火中Nb析出强化随温度提升逐渐增强,弥补了位错密度下降带来的强度损失,是试验钢屈服强度提升的主要原因。
- 耐候桥梁钢 /
- 回火处理 /
- 板条状贝氏体 /
- 粒状贝氏体 /
- 力学性能
Abstract: Two kinds of weathering bridge steels with lath-like bainite (Q470 steel) and granular bainite (Q550 steel) were prepared by controlling the cooling temperature after hot rolling. The effects of tempering treatment on the microstructure and mechanical properties of these two kinds of steels were investigated. Physical-chemical phase analysis method, X ray diffractometer and universal testing machine were used to characterize the evolution of microstructure and mechanical properties during tempering. The results showed that the yield strength and -40 ℃ impact energy of Q470 steel was higher than that of Q550 steel in hot rolling state. After tempering at 500-650 ℃, the yield strength of Q470 steel decreased first and then increased with the increase of tempering temperature (665-705 MPa), and the -40 ℃ impact energy gradually decreased from 300 J to 220 J. Under the same tempering conditions, the yield strength of Q550 steel increased with the increase of tempering temperature (500-650 MPa), and the -40 ℃ impact energy maintained at 210-230 J. The main strengthening mechanisms of these two kinds of steels were dislocation strengthening and fine grain strengthening. In addition, the strengthening of Nb precipitation gradually increases with increasing tempering temperature, compensating for the strength loss caused by the decrease in dislocation density, which was the main reason for the increase in yield strength of experimental steels.
- weathering bridge steel /
- tempering treatment /
- lath-like bainite /
- granular bainite /
- mechanical properties

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