Effect of vanadium content on microstructure and strength plasticity of X80 pipeline steel

Li Longfei; Lin Tengchang; Meng Huadong; Zhang Yang

doi:10.7513/j.issn.1004-7638.2023.05.020

Volume 44 Issue 5

Oct. 2023

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Li Longfei, Lin Tengchang, Meng Huadong, Zhang Yang. Effect of vanadium content on microstructure and strength plasticity of X80 pipeline steel[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(5): 130-138. doi: 10.7513/j.issn.1004-7638.2023.05.020

Citation:

Li Longfei, Lin Tengchang, Meng Huadong, Zhang Yang. Effect of vanadium content on microstructure and strength plasticity of X80 pipeline steel[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(5): 130-138. doi: 10.7513/j.issn.1004-7638.2023.05.020

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Effect of vanadium content on microstructure and strength plasticity of X80 pipeline steel

doi: 10.7513/j.issn.1004-7638.2023.05.020

1.
Department of Metallurgical Technology Research, Central Iron and Steel Research Institute, Beijing 100081, China
2.
MCC Capital Engineering and Research Incorporation Limited, Beijing 100176, China

Received Date: 2022-08-09
Available Online: 2023-11-04
Publish Date: 2023-10-31

Abstract

Abstract

In this work, the precipitates and microstructure characteristics in four X80 pipeline steels with different vanadium contents (0.036%, 0.075%, 0.110% and 0.150%) and their effects on the strength and plasticity of the steels were investigated by means of high-resolution transmission electron microscope, scanning electron microscope and electron backscatter diffraction. The results show that with increase of the vanadium content, the number and volume fraction of nano-sized precipitates in the steel increase. The size of precipitates in four experimental steels is mainly in the range of 0～20 nm. The number of precipitates with size less than 10 nm in the steel increases with increasing the vanadium content. The nano-sized second phase particles precipitated in or near the grain boundary are mostly vanadium containing carbides. The microstructure of four experimental steels with different vanadium contents is composed of massive ferrite and granular bainite. The proportions of large angle grain boundaries in steels are 23.27%, 20.69%, 23.13% and 16.24%, respectively, and the 4^# steel with the highest vanadium content has the least large angle grain boundaries. With increase of the vanadium content from 0.036% to 0.075%, the tensile strength and yield strength of the experimental steel are significantly improved. However, further increase of the vanadium content has little effect on the strength of the experimental steel, and even the yield strength has a certain decrease. The increasing strength of the experimental steel is mainly due to the combination of precipitation strengthening and fine grain strengthening of nano-sized precipitates, and the plasticity of the experimental steel is almost not affected by change of the vanadium content.
- X80 pipeline steel,
- vanadium content,
- precipitate,
- microstructure,
- strength plasticity

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References(17)

References

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