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<p>This study systematically investigates the hot deformation behavior and microstructural evolution of 06Cr23Ni13 stainless steel, focusing on the strain-rate-dependent mechanisms of dynamic recrystallization (DRX). Isothermal compression tests were conducted over a temperature range of 950-1250&#xa0;°C and strain rates of 0.01-10&#xa0;s<sup>−1</sup>. Advanced microstructural characterization via electron backscatter diffraction (EBSD) revealed fundamentally distinct recrystallization mechanisms in the constituent phases. The ferrite phase undergoes continuous dynamic recrystallization (CDRX), characterized by the progressive accumulation of misorientation and the gradual transformation of low-angle grain boundaries (LAGBs) into high-angle grain boundaries (HAGBs). In contrast, the austenite phase softens predominantly via discontinuous dynamic recrystallization (DDRX). A critical, non-monotonic grain size evolution was identified for austenite: grain refinement prevails at strain rates up to 1&#xa0;s<sup>−1</sup>, whereas anomalous grain coarsening occurs at 10&#xa0;s<sup>−1</sup>. This inversion is mechanistically attributed to adiabatic heating and a concomitant sharp increase in strain storage energy under high-strain-rate deformation, which collectively override conventional refinement kinetics by drastically enhancing both nucleation and growth rates. The present work provides critical insights into the competitive interplay between strain rate and thermal effects, clarifying pathways for microstructure control in stainless steels during thermomechanical processing.</p>

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Strain-Rate-Dependent Dynamic Recrystallization Mechanisms in 06Cr23Ni13 Stainless Steel During Hot Deformation

  • 期刊论文

  • 发表日期：

    2026年3月28日

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  • Mengyuan Ye,
  • Kexue Shi,
  • Wei Quan,
  • Shanglin Li,
  • Junchen Li

摘要

This study systematically investigates the hot deformation behavior and microstructural evolution of 06Cr23Ni13 stainless steel, focusing on the strain-rate-dependent mechanisms of dynamic recrystallization (DRX). Isothermal compression tests were conducted over a temperature range of 950-1250 °C and strain rates of 0.01-10 s−1. Advanced microstructural characterization via electron backscatter diffraction (EBSD) revealed fundamentally distinct recrystallization mechanisms in the constituent phases. The ferrite phase undergoes continuous dynamic recrystallization (CDRX), characterized by the progressive accumulation of misorientation and the gradual transformation of low-angle grain boundaries (LAGBs) into high-angle grain boundaries (HAGBs). In contrast, the austenite phase softens predominantly via discontinuous dynamic recrystallization (DDRX). A critical, non-monotonic grain size evolution was identified for austenite: grain refinement prevails at strain rates up to 1 s−1, whereas anomalous grain coarsening occurs at 10 s−1. This inversion is mechanistically attributed to adiabatic heating and a concomitant sharp increase in strain storage energy under high-strain-rate deformation, which collectively override conventional refinement kinetics by drastically enhancing both nucleation and growth rates. The present work provides critical insights into the competitive interplay between strain rate and thermal effects, clarifying pathways for microstructure control in stainless steels during thermomechanical processing.