Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (12): 3460-3467.doi: 10.13229/j.cnki.jdxbgxb.20230177

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Effect of thermo-mechanical processing parameters on dynamic recrystallization of 2.25Cr-lMo-0.25V Steel

Hong-ping AN(),Jian-guo WU   

  1. College of Materials Science and Engineering，Taiyuan University of Science and Technology，Taiyuan 030024，China
  • Received:2023-02-28 Online:2024-12-01 Published:2025-01-24

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Abstract:

Hot compression test for 2.25Cr-lMo-0.25V steel was carried out at the temperature of 950-1 200 ℃ and strain rate of 0.005-0.1 s-1 on Gleeble-1500D thermal simulator. Hot deformation behavior and dynamic recrystallization of this steel were systematically investigated. The flow stress and microstructure state were strongly depended on temperature and strain rate. The relationship between Zener-Hollomon parameter and the characteristic strain （critical strain and steady strain） was determined by linear fitting， and a dynamical recrystallization state diagram was established. The dynamical recrystallization kinematic equation of this steel and the model of complete dynamic recrystallization grain size were established based on experimental data and the stress-strain curves. The results could provide a theoretical basis for formulating reasonable hot working process.

Key words: metallic material, 2.25Cr-lMo-0.25V steel, processing parameters, dynamic recrystallization, hot compression

Fig.1

True stress strain curve under different deformation conditions"

Fig.2

Microstructure of the deformed specimens at strain rate 0.005 s-1and different deformation temperature"

Fig.3

Microstructure of the deformed specimens at temperature of 1 050 ℃ and different strain rate"

Fig.4

Peak stress fitting under different deformation conditions"

Fig.5

Dynamic recrystallization state diagram"

Fig.6

Relationship between work hardening rate and stress"

Fig.7

Comparisons between the experimental and the predicted dynamic recrystallized fractions"

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