ISSN:1003-8620

CN:42-1243/TF

主管:中信泰富特钢集团股份有限公司

主办:大冶特殊钢有限公司

特殊钢 ›› 2023, Vol. 44 ›› Issue (4): 108-113.DOI: 10.20057/j.1003-8620.2023-00004

• 成型与相变 • 上一篇    下一篇

Nb含量和热变形参数对纵向变截面耐候桥梁钢变形抗力及组织的影响

林田子1,2, 杨颖1,2, 翟晓亮3, 王厚昕4, 郭爱民4, 梁智涛3   

  1. 1 海洋装备用金属材料及其应用国家重点实验室,鞍山 114009;
    2 鞍钢集团钢铁研究院,鞍山 114009;
    3 中交第一公路勘察设计研究院有限公司,西安 710075;
    4 中信金属股份有限公司,北京 100004
  • 收稿日期:2023-01-11 出版日期:2023-08-01 发布日期:2023-07-14
  • 作者简介:林田子(1987-),男,硕士,高级工程师
  • 基金资助:
    交通运输行业重点科技项目(2019-MS2-046);中交第一公路勘察设计研究院有限公司科技研发基金项目(KCJJ2019-09);中信金属-CBMM微合金化技术中心R&D项目(D127/M1111)

Effect of Nb Content and Thermal Deformation Parameters on Deformation Resistance and Microstructure of Weather-resistant Bridge Steel with Longitudinal Variable Section

Lin Tianzi1,2, Yang Ying1,2, Zhai Xiaoliang3, Wang Houxin4, Guo Aimin4, Liang Zhitao3   

  1. 1 State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan 114009 , China;
    2 Iron and Steel Research Institute, Anshan Iron and Steel Group,Anshan 114009 , China;
    3 CCCC First Highway Consultants Co., Ltd., Xi'an 710075 , China;
    4 CITIC Metal Co., Ltd., Beijing 100004 , China
  • Received:2023-01-11 Published:2023-08-01 Online:2023-07-14

摘要: 通过Gleeble 3800热模拟试验机,对一种新型不同Nb含量纵向变截面耐候桥梁钢进行变形抗力试验,测定了试验钢在变形速率为1、5、10 s-1,变形温度为750~1 000 ℃,变形量为50%等不同变形参数下的变形-应力曲线。并通过金相显微镜、扫描电镜和透射电镜等手段,研究了试验钢在不同热变形参数下的显微组织变化。根据试验结果,分析了变形参数和Nb含量对纵向变截面耐候桥梁钢的变形抗力和显微组织的影响。结果表明:当Nb含量≥0.03%时,钢板的变形抗力显著增大,组织明显细化,添加一定量的Nb元素可提高钢板再结晶温度50 ℃以上,使LP耐候桥梁钢能够在变形温度为850~950 ℃的高温区轧制,以更好的保证LP钢板的板型和综合性能,为LP钢板产品的试制提供了理论依据。

关键词: 耐候桥梁钢, 纵向变截面, Nb含量, 变形参数, 变形抗力, 显微组织

Abstract: The deformation resistance test of a new type of longitudinal variable section weather-resistant bridge steel with different Nb content was carried out by Gleeble 3800 thermal simulation tester. The deformation stress curves of the steel were measured at different deformation parameters, such as deformation rate of 1, 5, 10 s-1, deformation temperature of 750-1 000 ℃ and deformation amount of 50%. The microstructure changes of the test steel under different thermal deformation parameters were studied by means of metallographic microscope, scanning electron microscope and transmission electron microscope. According to the test results, the influence principle and main reason of deformation parameters and Nb content on the deformation resistance and microstructure of longitudinal variable section were analyzed. The results show that when the content of Nb ≥0.03%, the deformation resistance of steel plate increases significantly, and the microstructure is obviously refined. The addition of certain Nb element can increase the recrystallization temperature of steel plate above 50 ℃, so that LP weather-resistant bridge steel can be rolled in the high temperature range of deformation temperature between 850 ℃ and 950 ℃, so as to better guarantee the profile and comprehensive properties of LP steel plate. It provides a theoretical basis for the trial production of LP steel plate.

Key words: Weather-resistant Bridge Steel, Longitudinal Variable Cross-section, Nb Content, Deformation Parameter, Deformation Resistance, Microstructure

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