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Research on the Hot Deformation Process of A100 Steel Based on High-Temperature Rheological Behavior and

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Researchers optimized hot deformation for A100 steel by studying rheological and dynamic recrystallization behaviors. The Hensel-Spittel model accurately predicted flow stress, revealing optimal conditions for complete recrystallization and finer grains.

Keywords:
constitutive modeldynamic recrystallizationgrain sizehot rheological behaviorhot working window

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Area of Science:

  • Materials Science
  • Metallurgy
  • Mechanical Engineering

Background:

  • Understanding hot deformation is crucial for optimizing steel processing.
  • Dynamic recrystallization significantly influences material properties and microstructure.
  • A100 steel requires specific processing parameters for desired outcomes.

Purpose of the Study:

  • To determine the optimal hot deformation process for A100 steel.
  • To investigate the rheological and dynamic recrystallization behaviors of A100 steel.
  • To establish predictive models for flow stress and dynamic recrystallization.

Main Methods:

  • Isothermal compression tests were conducted on A100 steel.
  • A Hensel-Spittel constitutive model was developed using stress-strain data.
  • Dynamic recrystallization percentage and grain size models were created.
  • Microstructural analysis validated the recrystallization model's accuracy.

Main Results:

  • Flow stress showed high sensitivity to strain rate and temperature.
  • The Hensel-Spittel model achieved high predictive accuracy (R²=0.9914).
  • A contradictory relationship exists between recrystallization percentage and grain size; higher recrystallization led to larger grains.

Conclusions:

  • The Hensel-Spittel model accurately describes A100 steel's rheological behavior under hot deformation.
  • Optimal hot working conditions (strain ≥ 0.6, 1193–1353 K, 0.1–1 s⁻¹) were identified for complete dynamic recrystallization and smaller grain size.
  • Processing strategies must balance recrystallization percentage and grain refinement to avoid undesirable microstructures.