Adaptive characterization of recrystallization kinetics in IF steel by electron backscatter diffraction

Area of Science:

• Materials Science
• Metallurgy
• Crystallography

Background:

• Quantifying recrystallization kinetics is crucial for understanding material property evolution during thermal processing.
• Traditional methods often suffer from operator-dependent errors, limiting precision in microstructure analysis.
• Electron Backscatter Diffraction (EBSD) offers high-resolution microstructural characterization but requires robust quantification methods.

Purpose of the Study:

• To develop a rigorous and operator-independent methodology for quantifying recrystallization kinetics using EBSD.
• To introduce an adaptive criterion for identifying recrystallized grains in partially recrystallized microstructures.
• To validate the proposed method against established techniques like Vickers microhardness.

Main Methods:

• Proposed an adaptive criterion based on adjustable grain orientation spread to identify recrystallized grains.
• Applied the methodology to interstitial-free steel samples subjected to cold rolling at true strain levels of 0.7 and 1.6.
• Utilized Electron Backscatter Diffraction (EBSD) for detailed microstructural analysis.

Main Results:

• The developed EBSD-based method significantly reduces errors associated with operator skill.
• Recrystallization kinetics determined by the proposed method showed excellent agreement with Vickers microhardness measurements.
• The method successfully characterized microstructure evolution across different stages of recrystallization, particularly in severely deformed materials.

Conclusions:

• The proposed EBSD methodology provides a rigorous and reliable approach for quantifying recrystallization kinetics.
• The adaptive criterion enhances the accuracy of identifying recrystallized grains, improving microstructure characterization.
• This technique is suitable for detailed analysis of progressive microstructure evolution, especially in heavily deformed metals.