12Cr1MoVG钢平衡相变与析出热力学研究

闻莉; 艾立群; 雷悦; 李亚强; 洪陆阔; 祝广鹏; 王旭锋

doi:10.7513/j.issn.1004-7638.2023.03.028

12Cr1MoVG钢平衡相变与析出热力学研究

doi: 10.7513/j.issn.1004-7638.2023.03.028

1.
华北理工大学冶金与能源学院, 河北唐山063210
2.
河北科技工程职业技术大学, 河北邢台054099

基金项目: 河北省自然科学基金(E2021209101，E2022209112)；唐山市人才资助项目(A20220212)；河北省研究生创新资助项目(CXZZBS2021100)；大学生创新创业项目(X2021215)。

详细信息

作者简介:
闻莉，1999年出生，女，硕士研究生，研究方向：钢铁冶金新理论、新工艺，E-mail:676396074@qq.com

通讯作者:
李亚强，1990年出生，男，博士，讲师，研究方向：钢铁冶金新理论、新工艺，E-mail: 1052270164@qq.com

中图分类号: TF76,TG142.1
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- 文章访问数: 103
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- 被引次数: 0
出版历程
- 收稿日期: 2022-09-24
- 刊出日期: 2023-06-30

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

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

摘要

摘要: 通过热力学软件JMatPro对12Cr1MoVG钢冷却过程中的相变和析出行为进行了研究，分析了钢中合金元素对纵裂纹敏感性的影响。结果表明，12Cr1MoVG钢从1600 ℃平衡冷却至400 ℃过程相变路径为：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。随着钢中P、S、Mo、V、Cr元素含量的增加，纵裂纹敏感性增加；而随着钢中Mn、Si元素含量的增加，纵裂纹敏感性降低。基于α+γ两相区温度区间和M(C,N)析出情况分析得到低温脆性温度区间为747.6～869 ℃，与拉伸试验测试结果基本一致。
- 12Cr1MoVG钢 /
- 纵裂 /
- 相变 /
- 热力学
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

HTML全文

图 1 12Cr1MoVG钢平衡相与温度的关系

Figure 1. Relationship between equilibrium phases and temperature of 12Cr1MoVG steel

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图 2 凝固过程中的相变

Figure 2. Phase transformation during solidification

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图 3 固相中平衡相与温度的关系

Figure 3. Relationship between equilibrium phases and temperature in solid phases

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图 4 MnS各元素组成

Figure 4. Composition of MnS

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图 5 MN含量随温度的变化

Figure 5. Variation of MN content with temperature

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图 6 MN元素组成

Figure 6. Composition of MN element

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图 7 MN、M(C,N)含量随温度的变化

Figure 7. Variation of MN and M (C, N) contents with temperature

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图 8 两相区、低温区平衡相与温度的关系

Figure 8. Relationship between equilibrium phases and temperature in two-phase region and low-temperature region

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图 9 AlN含量随温度的变化

Figure 9. Variation of AlN content with temperature

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图 10 M₂₃C₆含量随温度的变化

Figure 10. Change of M23C6 content with temperature

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图 11 M₂₃C₆各元素组成

Figure 11. Composition of M23C6

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图 12 S含量对T_LI～T_ZD的影响

Figure 12. Effect of S content on T_LI～T_ZD

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图 13 P含量对T_LI～T_ZD的影响

Figure 13. Effect of P content on T_LI～T_ZD

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图 14 Mo含量对T_LI～T_ZD的影响

Figure 14. Effect of Mo content on T_LI～T_ZD

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图 15 V含量对T_LI～T_ZD的影响

Figure 15. Effect of V content on T_LI～T_ZD

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图 16 Cr含量对T_LI～T_ZD的影响

Figure 16. Effect of Cr content on T_LI～T_ZD

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图 17 Mn含量对T_LI～T_ZD的影响

Figure 17. Effect of Mn content on T_LI～T_ZD

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图 18 Si含量对T_LI～T_ZD的影响

Figure 18. Effect of Si content on T_LI～T_ZD

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表 1 12Cr1MoVG钢主要化学成分

Table 1. Chemical composition of 12Cr1MoVG steel %

C Si Mn P S Als Cr Mo V Nb N

0.09～0.14 0.17~
0.35 0.45~
0.7 ≤
0.02 ≤
0.01 ≤
0.02 0.95~1.2 0.25
~
0.35 0.17
~
0.3 ≤
0.02 ≤
0.008

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