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Simulation of Continuous Dynamic Recrystallization Using a Level-Set Method.

Victor Grand1,2, Baptiste Flipon2, Alexis Gaillac1

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|December 11, 2022
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Summary
This summary is machine-generated.

This study introduces a numerical framework to predict microstructure evolution during hot forming, focusing on dynamic recrystallization. The model accurately simulates subgrain formation and evolution, crucial for understanding material behavior under heat and pressure.

Keywords:
continuous dynamic recrystallizationgrain growthhot forminglevel-setnumerical simulation

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Area of Science:

  • Materials Science
  • Metallurgy
  • Computational Modeling

Background:

  • Dynamic recrystallization is key to microstructure evolution during hot forming.
  • Predicting these mechanisms is essential for materials processing.
  • Existing models often lack detailed subgrain structure consideration.

Purpose of the Study:

  • To develop a full-field numerical framework for predicting subgrain structure evolution.
  • To model grain growth, continuous dynamic recrystallization, and post-dynamic recrystallization.
  • To analyze the influence of microstructure topology and subgrain parameters.

Main Methods:

  • A two-step tessellation algorithm for generating substructured microstructures.
  • Simulation of new subgrain formation during hot deformation.
  • Modeling of grain growth with varying subgrain parameters and stored energy.

Main Results:

  • Selective subgrain growth observed with sigmoidal mobility functions.
  • Quantitative comparison of recrystallization kinetics based on different discrimination criteria.
  • Assessment of the framework's ability to model continuous dynamic and post-dynamic recrystallization in Zircaloy-4.

Conclusions:

  • The proposed framework accurately predicts subgrain evolution during hot forming.
  • Microstructure topology and subgrain parameters significantly influence recrystallization.
  • The model's sensitivity and suitability are evaluated for Zircaloy-4 hot extrusion.