Precipitation kinetics of composite carbides of Nb-Ti-V-Mo microalloyed steel

Yao Na; Xing Chao

doi:10.7513/j.issn.1004-7638.2022.04.022

Volume 43 Issue 4

Sep. 2022

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Yao Na, Xing Chao. Precipitation kinetics of composite carbides of Nb-Ti-V-Mo microalloyed steel[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(4): 142-149. doi: 10.7513/j.issn.1004-7638.2022.04.022

Citation:

Yao Na, Xing Chao. Precipitation kinetics of composite carbides of Nb-Ti-V-Mo microalloyed steel[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(4): 142-149. doi: 10.7513/j.issn.1004-7638.2022.04.022

Yao Na, Xing Chao. Precipitation kinetics of composite carbides of Nb-Ti-V-Mo microalloyed steel[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(4): 142-149. doi: 10.7513/j.issn.1004-7638.2022.04.022

Citation:

Yao Na, Xing Chao. Precipitation kinetics of composite carbides of Nb-Ti-V-Mo microalloyed steel[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(4): 142-149. doi: 10.7513/j.issn.1004-7638.2022.04.022

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Precipitation kinetics of composite carbides of Nb-Ti-V-Mo microalloyed steel

doi: 10.7513/j.issn.1004-7638.2022.04.022

Yao Na,
Xing Chao

Department of Metallurgy and Chemical Engineering, Jiyuan Vocational and Technical College, Jiyuan 459000, Henan, China

Received Date: 2022-01-07
Publish Date: 2022-09-14

Abstract

Abstract

The precipitation thermodynamics of the multi-element composite precipitates in the Nb-Ti-V-Mo microalloy E460 off shore steel was calculated by JmatPro thermodynamics software, in combination with the classical nucleation and growth kinetic theory, were used to study precipitation law of (Nb,Ti,Mo,V)C in austenite and ferrite. The influence of austenite deformation storage and deformation-induced precipitation on (Nb,Ti,Mo,V)C precipitation and precipitation kinetics were also discussed. The results indicate that (Nb,Ti,Mo,V)C begins to precipitate at 1 448.6 K. In austenite region, as the temperature decreases the critical nucleation energy gradually decreases, and the NrT curve and the PTT curve show a monotonous trend. In the two-phase region of austenite and ferrite, the fastest precipitation temperature of (Nb,Ti,Mo,V)C is 1 062.6 K. Relative nucleation rate increases, and both precipitation and incubation period shorten with the increase of deformation energy storage. As the amount of precipitation induced by deformation increases, the PTT curve shifts to the left, and the maximum nucleation rate temperature and the fastest precipitation temperature are between 1058.3 K and 1063.8 K.
- Nb-Ti-V-Mo microalloyed steel,
- carbide,
- precipitation kinetics,
- PTT curve,
- NrT curve

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References(20)

References

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