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Modeling Bainitic Transformations during Press Hardening.

Mingxuan Lin1, Carina Zimmermann2, Kai Wang3

  • 1Instituts für Eisenhüttenkunde, RWTH Aachen University, 52072 Aachen, Germany.

Materials (Basel, Switzerland)
|February 12, 2021
PubMed
Summary
This summary is machine-generated.

External stresses and pre-strain significantly influence bainitic transformations during press hardening. This study analyzes variant selection and develops scale-bridging models for microstructure evolution in 22MnB5 steel.

Keywords:
bainitephase fieldpress hardening

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Area of Science:

  • Materials Science
  • Metallurgy
  • Computational Materials Science

Background:

  • Press hardening of advanced high-strength steels involves complex phase transformations.
  • Bainitic transformations are critical for achieving desired mechanical properties.
  • Understanding the influence of external stresses and pre-strain is essential for process optimization.

Purpose of the Study:

  • To investigate the effect of external stresses and pre-strain on bainitic transformations.
  • To analyze the variant selection phenomenon in bainitic microstructures.
  • To develop scale-bridging models for thermo-chemo-mechanical coupling during bainitic transformation.

Main Methods:

  • Experimental study of transformation kinetics in 22MnB5 steel under tensile stress.
  • Microstructural analysis using an optimized prior-austenite grain reconstruction technique.
  • Development of phenomenological and phase field models incorporating ab initio mechanical parameters.

Main Results:

  • Experimental data on macroscopic and microstructural transformation kinetics were obtained.
  • Variant selection effects in bainitic microstructures were quantitatively analyzed.
  • Thermodynamically consistent phase field models were developed, capturing orientation relationships.

Conclusions:

  • External stresses and pre-strain play a crucial role in bainitic transformation kinetics and variant selection.
  • The developed models provide a framework for understanding and predicting microstructure evolution across multiple length scales.
  • This research contributes to the optimized design of press hardening processes for advanced steels.