Effect of Nb Content and Thermal Deformation Parameters on Deformation Resistance and Microstructure of Weather-resistant Bridge Steel with Longitudinal Variable Section
Forming and Phase Transition|更新时间:2026-01-21
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Effect of Nb Content and Thermal Deformation Parameters on Deformation Resistance and Microstructure of Weather-resistant Bridge Steel with Longitudinal Variable Section
Special SteelVol. 44, Issue 4, Pages: 108-113(2023)
Lin Tianzi,Yang Ying,Zhai Xiaoliang,et al.Effect of Nb Content and Thermal Deformation Parameters on Deformation Resistance and Microstructure of Weather-resistant Bridge Steel with Longitudinal Variable Section[J].Special Steel,2023,44(04):108-113.
Lin Tianzi,Yang Ying,Zhai Xiaoliang,et al.Effect of Nb Content and Thermal Deformation Parameters on Deformation Resistance and Microstructure of Weather-resistant Bridge Steel with Longitudinal Variable Section[J].Special Steel,2023,44(04):108-113. DOI: 10.20057/j.1003-8620.2023-00004.
Effect of Nb Content and Thermal Deformation Parameters on Deformation Resistance and Microstructure of Weather-resistant Bridge Steel with Longitudinal Variable Section
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
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, 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.
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