Research on the effect of Nb-V composite microalloying on austenite recrystallization of pipeline steel

Ma Qilin; Jia Shujun; Yin Shubiao; Li Ba; Liu Qingyou

doi:10.7513/j.issn.1004-7638.2023.01.025

Volume 44 Issue 1

Feb. 2023

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Ma Qilin, Jia Shujun, Yin Shubiao, Li Ba, Liu Qingyou. Research on the effect of Nb-V composite microalloying on austenite recrystallization of pipeline steel[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(1): 158-166. doi: 10.7513/j.issn.1004-7638.2023.01.025

Citation:

Ma Qilin, Jia Shujun, Yin Shubiao, Li Ba, Liu Qingyou. Research on the effect of Nb-V composite microalloying on austenite recrystallization of pipeline steel[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(1): 158-166. doi: 10.7513/j.issn.1004-7638.2023.01.025

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Research on the effect of Nb-V composite microalloying on austenite recrystallization of pipeline steel

doi: 10.7513/j.issn.1004-7638.2023.01.025

Ma Qilin^{1, 2
,},
Jia Shujun^{2
,
,},
Yin Shubiao¹,
Li Ba²,
Liu Qingyou²

1.
School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
2.
Engineering Steel Institute, Central Iron and Steel Research Institute, Beijing 100065, China

Received Date: 2021-08-10
Publish Date: 2023-02-28

Abstract

Abstract

Through heat treatment test, microstructure observation, thermodynamic model calculation and thermo-cacl software, the austenite grain size as well asthe dissolution and precipitation behavior of microalloying elements in pipeline steel during reheating had been investigated.. The results show that when the test steel is reheated at 1180 ℃ and held for 1.5 hours, the austenite grain size order is as follows: Nb steel (61.14 μm±5.59 μm)<Nb-V steel (63.84 μm±5.52 μm)<V steel (71.89 μm ±6.8 μm) . Under this condition, the solid solution Nb content of Nb steel is 0.064%, while the solid solution Nb content of Nb-V test steel is 0.05%. The difference between the solid solution Nb content of the two test steels in austenite is only 0.014%. The predication from established thermodynamic model shows that the activation energy of austenite grain growth in the temperature range of 1050 ℃ to 1250 ℃ exists in QNb steel>QNb-V steel>QV steel, which further confirms that the growth of austenite grains at this stage is mainly positively correlated with the solid solution amount of Nb element. Under investigated reheating condition, the prior austenite grain size and solid solution Nb content in Nb-V test steel is similar to that of Nb steel, which confirms the feasibility of Nb-V microalloying pipeline steel from the prospective of reheating stage.
- pipeline steel,
- Nb-V composite microalloying,
- austenite grain size,
- second phase precipitation,
- activation energy

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References(27)

References

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