Effect of vanadium content on microstructure and precipitation of rare earth treated X80 linepipe steels

Wang Shudan; Song Bo; Mao Jinghong

doi:10.7513/j.issn.1004-7638.2022.02.019

Volume 43 Issue 2

May 2022

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Wang Shudan, Song Bo, Mao Jinghong. Effect of vanadium content on microstructure and precipitation of rare earth treated X80 linepipe steels[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(2): 125-132, 177. doi: 10.7513/j.issn.1004-7638.2022.02.019

Citation:

Wang Shudan, Song Bo, Mao Jinghong. Effect of vanadium content on microstructure and precipitation of rare earth treated X80 linepipe steels[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(2): 125-132, 177. doi: 10.7513/j.issn.1004-7638.2022.02.019

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Effect of vanadium content on microstructure and precipitation of rare earth treated X80 linepipe steels

doi: 10.7513/j.issn.1004-7638.2022.02.019

1.
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
2.
Institute of Advanced Materials Technology, University of Science and Technology Beijing, Beijing 100083, China

Received Date: 2021-11-15
Available Online: 2022-05-11
Publish Date: 2022-04-28

Abstract

Abstract

In order to improve the corrosion resistance of X80 linepipe steel, different vanadium content (0.05%, 0.10% and 0.15%) was added into a rare earth (0.02%) treated X80 linepipe steel. Optical microscope (OM), cold field emission scanning electron microscope, thermodynamic software Thermo-CalC, transmission electron microscopy and energy dispersive spectrometer (TEM-EDS) had been used to investigate the structure and inclusions in steel to reveal formation mechanism of acicular ferrite in rare earth treated steel. Besides, the effects of different vanadium content gradients on the microstructure and precipitation of the experimental steels had been studied by thermodynamic calculations. Moreover, the corrosion resistance of experimental steels with different vanadium content in NaCl (3.5%) solution was tested by electrochemical technology. The results indicate that rare earth can bring inclusion modification and facilitate the formation of acicular ferrite. Vanadium can achieve grain refinement. The transmission electron microscope shows a positive correlation between the number and average size of precipitates and vanadium content, which causes a pinning effect and improves the strength of steel. The polarization curve and the AC impedance curve suggest that the corrosion resistance of the experimental steel is initially increased and then decreased with the increase of vanadium content. Vanadium can accelerate the formation of ferrite, which in turn lead to lower corrosion resistance ability due to refine grains.
- X80 linepipe steels,
- thermodynamic computation,
- acicular ferrite,
- vanadium carbonitride,
- electrochemistry

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References(27)

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