Effect of Final Temperature of Cooling on Microstructure and Properties of Aseismic High-strength Steel Rebar

被引：0
|
作者：
Zeng Z. [1 ]
Li C. [1 ,2 ]
Li Z. [1 ,2 ]
Huang S. [1 ]
Li S. [1 ]
You J. [1 ]
机构：
[1] School of Materials and Metallurgy, Guizhou University, Guiyang
[2] Key Laboratory of Metallurgical Engineering and Process Energy Conservation of Guizhou Province, Guiyang
来源：
Cailiao Yanjiu Xuebao/Chinese Journal of Materials Research | 2021年 / 35卷 / 11期
基金：
中国国家自然科学基金;
关键词：
Final cooling temperature; High-strength anti-seismic rebar; Mechanical properties; Metallic materials; Microstructure;
D O I：
10.11901/1005.3093.2021.010
中图分类号：
学科分类号：
摘要：
The thermal simulation test of an experimental aseismic high strength steel was conducted by Gleeble-3800 thermal simulator, then its microstructure, second phase, mechanical properties and fracture morphology were characterized by metallographic microscopy (OM), field emission scanning electron microscopy (SEM), high resolution transmission electron microscopy (TEM) and universal tensile testing machine. Meanwhile, the effect of final temperature of cooling on the microstructure and properties of the steel was carefully examined, and the grain refinement mechanism induced by microalloying elements was revealed. The results show that: the microstructure of the steel consists mainly of phases ferrite and pearlite, and the ferrite grain was refined with the decrease of the final temperature of cooling. The average diameter of precipitated carbides (Nb, Ti, V) C and (V, Nb, Ti) C distributed in the ferrite matrix of the steel is about 2 nm and 5 nm respectively for the final temperature of cooling 650℃. The tensile strength and yield strength of the steel increase with the decrease of the final temperature of cooling. When the final temperature of cooling is 650℃, the corresponding tensile strength and yield strength are 638.75 MPa and 467 MPa, respectively, and the strength/yield ratio is 1.37. The tensile fractured surface of steels, which have been experienced thermal simulation tests with different final temperatures of cooling, exhibits mainly equiaxed dimples of different sizes and depths. © 2021, Editorial Office of Chinese Journal of Materials Research. All right reserved.
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页码：857 / 865
页数：8
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