Thermodynamic study on equilibrium phase transformation and precipitation of 12Cr1MoVG steel

Wen Li; Ai Liqun; Lei Yue; Li Yaqiang; Hong Lukuo; Zhu Guangpeng; Wang Xufeng

doi:10.7513/j.issn.1004-7638.2023.03.028

Volume 44 Issue 3

Jun. 2023

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Wen Li, Ai Liqun, Lei Yue, Li Yaqiang, Hong Lukuo, Zhu Guangpeng, Wang Xufeng. Thermodynamic study on equilibrium phase transformation and precipitation of 12Cr1MoVG steel[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(3): 183-190. doi: 10.7513/j.issn.1004-7638.2023.03.028

Citation:

Wen Li, Ai Liqun, Lei Yue, Li Yaqiang, Hong Lukuo, Zhu Guangpeng, Wang Xufeng. Thermodynamic study on equilibrium phase transformation and precipitation of 12Cr1MoVG steel[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(3): 183-190. doi: 10.7513/j.issn.1004-7638.2023.03.028

Citation:

Wen Li, Ai Liqun, Lei Yue, Li Yaqiang, Hong Lukuo, Zhu Guangpeng, Wang Xufeng. Thermodynamic study on equilibrium phase transformation and precipitation of 12Cr1MoVG steel[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(3): 183-190. doi: 10.7513/j.issn.1004-7638.2023.03.028

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Thermodynamic study on equilibrium phase transformation and precipitation of 12Cr1MoVG steel

doi: 10.7513/j.issn.1004-7638.2023.03.028

1.
College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, Hebei, China
2.
Hebei Vocational University of Technology and Engineering, Xingtai 054099, Hebei, China

Received Date: 2022-09-24
Publish Date: 2023-06-30

Abstract

Abstract

The phase transformation and precipitation behavior of 12Cr1MoVG steel during cooling were studied by thermodynamic software JMatPro, and the effect of alloying elements in the steel on longitudinal crack sensitivity was analyzed. The results show that the transformation path of 12Cr1MoVG steel from 1600 ℃ to 400 ℃ is L→ L+δ→ L+δ+γ→ δ+γ→ γ→ γ+MnS→ γ+MnS+MN→ γ+MnS+M(C,N)→ γ+α+MnS+M(C,N)→ γ+α+MnS+M(C,N)+AlN→ γ+α+MnS+M(C,N)+M(C,N)+AlN+M₂₃C₆→ α+MnS+M(C,N)+M(C,N)+AlN+M₂₃C₆. With the increase of P, S, Mo, V and Cr contents in the steel, the longitudinal crack sensitivity increases. While, the longitudinal crack sensitivity decreases with the increase of Mn and Si contents. Based on the temperature range of the (α+γ) two-phase region and the precipitation behavior of M (C, N), the low-temperature brittleness temperature range is calculated to be in the range of 747.6～869 ℃, which is basically consistent with the tensile testing results.
- 12Cr1MoVG steel,
- longitudinal crack,
- phase transformation,
- thermodynamics

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References(18)

References

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