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<p><i>In situ</i> high-energy X-ray diffraction (XRD) was used to examine the microstructural changes that occur during uniaxial hot compression and isothermal annealing. This method provided valuable insights into the recovery and recrystallization behaviors that occur during the manufacturing process. The γ-phase dislocation density changes in the Ni–30 mass pct Fe austenitic alloy well aligned with those in Fe−0.2 mass pct C martensitic steel during hot compression and isothermal annealing. A comparison between the <i>in situ</i> and <i>ex situ</i> XRD data of Fe−0.2 mass pct C and Ni–30 mass pct Fe, respectively, revealed a strong correlation between the γ-phase dislocation density variation behaviors of these materials. Despite the microstructure mainly consisting of coarse, unrecrystallized grains with a high dislocation density, dynamic recrystallization occurred to some extent at 750&#xa0;°C owing to the work-hardening rate. The recrystallization rate varied with isothermal annealing time, enabling classification of the dislocation density according to static recovery and recovery/recrystallization. The recrystallization activation energy, estimated from grain orientation spread changes, was approximately 280 kJ/mol, which was similar to that of pure Ni metal. These results provide comprehensive insights into the recovery and recrystallization behaviors in the high-temperature γ-phase of low-carbon steels.</p>

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High-Energy X-ray Dynamics of the Recovery and Recrystallization Behaviors of Steels Subjected to Uniaxial Hot Compression and Isothermal Annealing

  • 期刊论文

  • 发表日期：

    2025年2月4日

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  • Mitsuharu Yonemura,
  • Satoshi Sugano,
  • Itsuki Yamaguchi,
  • Hidenori Toyokawa,
  • Hiroyuki Saito

摘要

In situ high-energy X-ray diffraction (XRD) was used to examine the microstructural changes that occur during uniaxial hot compression and isothermal annealing. This method provided valuable insights into the recovery and recrystallization behaviors that occur during the manufacturing process. The γ-phase dislocation density changes in the Ni–30 mass pct Fe austenitic alloy well aligned with those in Fe−0.2 mass pct C martensitic steel during hot compression and isothermal annealing. A comparison between the in situ and ex situ XRD data of Fe−0.2 mass pct C and Ni–30 mass pct Fe, respectively, revealed a strong correlation between the γ-phase dislocation density variation behaviors of these materials. Despite the microstructure mainly consisting of coarse, unrecrystallized grains with a high dislocation density, dynamic recrystallization occurred to some extent at 750 °C owing to the work-hardening rate. The recrystallization rate varied with isothermal annealing time, enabling classification of the dislocation density according to static recovery and recovery/recrystallization. The recrystallization activation energy, estimated from grain orientation spread changes, was approximately 280 kJ/mol, which was similar to that of pure Ni metal. These results provide comprehensive insights into the recovery and recrystallization behaviors in the high-temperature γ-phase of low-carbon steels.