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<p>Austenitic stainless steels exhibit exceptional properties and broad application prospects. The high-temperature deformation characteristics of 316L austenitic stainless steel were examined through isothermal compression testing (800-1200&#xa0;°C; 0.01-5 s<sup>-1</sup>) on a Gleeble−1500 simulator. Utilizing the resulting true stress–strain curves, we established and verified an accurate strain-compensated Arrhenius constitutive model for flow stress prediction. A processing map was further developed using the dynamic materials model (DMM). The effects of strain rate, temperature, and strain on dynamic phase transformation behavior were analyzed through microstructural characterization of compressed specimens. Results demonstrate that elevated temperatures promote the transformation of low-angle grain boundaries (LAGBs) to high-angle grain boundaries (HAGBs), while simultaneously altering the volume fraction and size of dynamically recrystallized (DRX) grains. Optimal forming conditions were identified at high temperatures and low strain rates. Discontinuous dynamic recrystallization (DDRX) governs the recrystallization mechanism during hot deformation of austenitic stainless steel. Continuous dynamic recrystallization (CDRX) acts as a secondary mechanism, primarily occurring under low-temperature/high-strain-rate conditions. Increasing temperature enhances DDRX but suppresses CDRX.</p>

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Deformation Characteristics and Microstructure Evolution during Hot Deformation of 316L Austenitic Stainless Steel

  • 期刊论文

  • 发表日期：

    2026年1月20日

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  • Yujie Xiao,
  • Yasong Xu,
  • Lizhong Chang,
  • Tao Xu,
  • Ke Zhang,
  • Jinghui Li

摘要

Austenitic stainless steels exhibit exceptional properties and broad application prospects. The high-temperature deformation characteristics of 316L austenitic stainless steel were examined through isothermal compression testing (800-1200 °C; 0.01-5 s-1) on a Gleeble−1500 simulator. Utilizing the resulting true stress–strain curves, we established and verified an accurate strain-compensated Arrhenius constitutive model for flow stress prediction. A processing map was further developed using the dynamic materials model (DMM). The effects of strain rate, temperature, and strain on dynamic phase transformation behavior were analyzed through microstructural characterization of compressed specimens. Results demonstrate that elevated temperatures promote the transformation of low-angle grain boundaries (LAGBs) to high-angle grain boundaries (HAGBs), while simultaneously altering the volume fraction and size of dynamically recrystallized (DRX) grains. Optimal forming conditions were identified at high temperatures and low strain rates. Discontinuous dynamic recrystallization (DDRX) governs the recrystallization mechanism during hot deformation of austenitic stainless steel. Continuous dynamic recrystallization (CDRX) acts as a secondary mechanism, primarily occurring under low-temperature/high-strain-rate conditions. Increasing temperature enhances DDRX but suppresses CDRX.