Effect of different vanadium and nitrogen contents on microstructure and properties of Nb-V microalloyed high-strength seismic reinforcement

Lu Jie; Su Qixiang; Huang Jixiang; Zhang Huanhuan; Lei Ting; Yin Shubiao; Ma Zhenghong

doi:10.7513/j.issn.1004-7638.2023.04.022

Volume 44 Issue 4

Aug. 2023

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Article Navigation > IRON STEEL VANADIUM TITANIUM > 2023 > 44(4): 149-157

Lu Jie, Su Qixiang, Huang Jixiang, Zhang Huanhuan, Lei Ting, Yin Shubiao, Ma Zhenghong. Effect of different vanadium and nitrogen contents on microstructure and properties of Nb-V microalloyed high-strength seismic reinforcement[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(4): 149-157. doi: 10.7513/j.issn.1004-7638.2023.04.022

Citation:

Lu Jie, Su Qixiang, Huang Jixiang, Zhang Huanhuan, Lei Ting, Yin Shubiao, Ma Zhenghong. Effect of different vanadium and nitrogen contents on microstructure and properties of Nb-V microalloyed high-strength seismic reinforcement[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(4): 149-157. doi: 10.7513/j.issn.1004-7638.2023.04.022

Citation:

Lu Jie, Su Qixiang, Huang Jixiang, Zhang Huanhuan, Lei Ting, Yin Shubiao, Ma Zhenghong. Effect of different vanadium and nitrogen contents on microstructure and properties of Nb-V microalloyed high-strength seismic reinforcement[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(4): 149-157. doi: 10.7513/j.issn.1004-7638.2023.04.022

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Effect of different vanadium and nitrogen contents on microstructure and properties of Nb-V microalloyed high-strength seismic reinforcement

doi: 10.7513/j.issn.1004-7638.2023.04.022

1.
Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
2.
Kunming Metallurgy College Metallurgy and Mining College, Anning 650300, Yunnan, China
3.
Jiangsu Yonggang Group Co., Ltd., Suzhou 215000, Jiangsu, China

Received Date: 2023-01-04
Publish Date: 2023-08-30

Abstract

Abstract

Vanadium and nitrogen can effectively improve the comprehensive performance of Nb-V microalloyed high strength seismic reinforcement. The microstructure of three kinds of Nb-V microalloyed high-strength seismic reinforcement bars with different vanadium and nitrogen contents was characterized and tested by metallographic microscope, scanning electron microscope, transmission electron microscope and mechanical testing machine. The results show that the final microstructure of the three test steels is composed of ferrite, pearlite and small amount of bainite. As vanadium and nitrogen contents in test steel increases, the ferrite grain size is reduced, pearlite lamellar spacing is gradually thinning. With the increase of vanadium and nitrogen contents in precipitated phase NbV (C, N), the volume fraction of precipitated second phase particles increases and the particle size decreases. The fracture morphology of the tested steels is dimple fracture, and the dimple deepens and the diameter increases with the increase of vanadium and nitrogen contents. In terms of mechanical properties, tensile strength increases, yield strength and hardness slightly decrease and then increases.
- high-strength seismic reinforcement,
- Nb-V microalloying,
- microstructure,
- fracture morphology,
- precipitated phase,
- mechanical properties

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References(35)

References

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