金属热处理 ›› 2023, Vol. 48 ›› Issue (10): 23-28.DOI: 10.13251/j.issn.0254-6051.2023.10.003

• 特约专栏 • 上一篇    下一篇

不同热处理工艺对大厚度桥梁钢组织和性能的影响

杨颖1,2, 徐宏亮3, 王玉博1,2, 武会宾3, 毛新平3   

  1. 1.海洋装备用金属材料及其应用国家重点实验室, 辽宁 鞍山 114009;
    2.鞍钢集团 钢铁研究院, 辽宁 鞍山 114009;
    3.北京科技大学 钢铁共性技术协同创新中心, 北京 100083
  • 收稿日期:2023-05-11 修回日期:2023-08-08 出版日期:2023-10-25 发布日期:2023-12-07
  • 通讯作者: 武会宾,教授,博士,E-mail:whbustb@163.com
  • 作者简介:杨 颖(1971—), 女,教授级高级工程师, 硕士,主要研究方向为金属材料,1804500570@qq.com。
  • 基金资助:
    国家重点研发计划(2021YFB3701700)

Effect of different heat treatment processes on microstructure and properties of large-thickness bridge steels

Yang Ying1,2, Xu Hongliang3, Wang Yubo1,2, Wu Huibin3, Mao Xinping3   

  1. 1. State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan Liaoning 114009, China;
    2. Iron and Steel Research Institute, Anshan Iron and Steel Group, Anshan Liaoning 114009, China;
    3. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China
  • Received:2023-05-11 Revised:2023-08-08 Online:2023-10-25 Published:2023-12-07

摘要: 研究了不同热处理工艺对C-Mn-Nb-V成分体系大厚度耐候桥梁钢组织特征的影响。利用光学显微镜、扫描电镜(SEU)和背散射电子衍射(EBSD)研究了TMCP、TMCP+回火和TMCP+调质3种不同工艺下钢板的组织演变特征。结果表明,采用TMCP工艺处理后,钢板组织为粒状贝氏体、多边形铁素体以及M/A岛组成的复相组织;采用TMCP+回火工艺处理后,回复和再结晶程度高,M/A岛消失,组织细小均匀,最终组织为粒状贝氏体和多边形铁素体;采用TMCP+调质工艺处理后,得到了粒状贝氏体、多边形铁素体和少量的M/A岛的混合组织,晶粒在再结晶后略有长大。因此,TMCP+回火工艺后,钢板的显微组织最为优良,综合力学性能最好。

关键词: 桥梁钢, TMCP, 回火, 调质, 组织

Abstract: Effect of different heat treatment processes on microstructural characteristics of large-thickness weathering bridge steels with a C-Mn-Nb-V composition system were investigated. The microstructure evolution of the steel under three different processes (TMCP, TMCP+tempering, and TMCP+quenching and tempering) was investigated by means of optical microscope, scanning electron microscope (SEM), and electron backscattered diffraction(EBSD). The results show that the microstructure is composed of granular bainite, polygonal ferrite, and M/A islands after the TMCP process. After the TMCP+tempering process, the degree of recovery and recrystallization is high, M/A islands disappear, and the microstructure is fine and uniform, which is granular bainite and polygonal ferrite. After the TMCP+quenching and tempering process, a complex phase of granular bainite, polygonal ferrite, and a small amount of M/A islands is obtained, and the grains grow slightly after recrystallization. Therefore, the microstructure and comprehensive properties of the steel plate is the best after TMCP+tempering process.

Key words: bridge steel, TMCP, tempering, quenching and tempering, microstructure

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