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<p>Dynamic recrystallization (DRX) is a significant mechanism controlling the microstructure evolution and mechanical property enhancement during the hot deformation for 20Cr2Ni4A steel, and systematic investigations related to DRX numerical model and evolution mechanism are necessary to achieve the optimal processing parameters for the studied steel. Hot compression experiments were conducted at temperatures ranging from 900 to 1200 °C and strain rates from 0.01 to 1 s<sup>−1</sup>, and a series of models which consisted of critical strain model, DRX kinetic model, and grain size model were established and verified. Results indicate complete DRX could be activated at deformation temperature above 1100 °C together with a strain rate below 0.1&#xa0;s<sup>−1</sup>. The DRX model considering the corrections of deformation heat and friction heat could effectively predict the DRX behavior of the studied steel, and the average absolute relative error related to volume fraction of DRX and average grain size is determined to be within ~ 8.0%, indicating the reliability of the established DRX model. The low strain rate and high deformation amount are beneficial for the occurrence of DRX with respect to the studied steel, and sufficient energy and more time for dislocation rearrangement and grain boundary migration could be achieved at deformation conditions of high deformation amount and low strain rate, which facilitates DRX nucleation and grain growth. The discontinuous dynamic recrystallization (DDRX) mechanism is predominant in the DRX behavior under overall experimental conditions with respect to the studied 20Cr2Ni4A steel, and the nucleation is prone to be generated nearby the high dislocation density regions adjacent to parent grain boundaries via grain boundary migration.</p>

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Research on Dynamic Recrystallization Behavior and Mechanism of 20Cr2Ni4A Steel during Hot Deformation: Combining the FEM Method and EBSD Technique

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • H. Zheng,
  • Z. D. Bai,
  • X. L. Su,
  • J. H. Zhao,
  • W. W. He,
  • Q. X. Ma

摘要

Dynamic recrystallization (DRX) is a significant mechanism controlling the microstructure evolution and mechanical property enhancement during the hot deformation for 20Cr2Ni4A steel, and systematic investigations related to DRX numerical model and evolution mechanism are necessary to achieve the optimal processing parameters for the studied steel. Hot compression experiments were conducted at temperatures ranging from 900 to 1200 °C and strain rates from 0.01 to 1 s−1, and a series of models which consisted of critical strain model, DRX kinetic model, and grain size model were established and verified. Results indicate complete DRX could be activated at deformation temperature above 1100 °C together with a strain rate below 0.1 s−1. The DRX model considering the corrections of deformation heat and friction heat could effectively predict the DRX behavior of the studied steel, and the average absolute relative error related to volume fraction of DRX and average grain size is determined to be within ~ 8.0%, indicating the reliability of the established DRX model. The low strain rate and high deformation amount are beneficial for the occurrence of DRX with respect to the studied steel, and sufficient energy and more time for dislocation rearrangement and grain boundary migration could be achieved at deformation conditions of high deformation amount and low strain rate, which facilitates DRX nucleation and grain growth. The discontinuous dynamic recrystallization (DDRX) mechanism is predominant in the DRX behavior under overall experimental conditions with respect to the studied 20Cr2Ni4A steel, and the nucleation is prone to be generated nearby the high dislocation density regions adjacent to parent grain boundaries via grain boundary migration.