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Discrimination of dynamically and post-dynamically recrystallized grains based on EBSD data: application to Inconel

A Nicolaÿ1,2, J M Franchet2, J Cormier3

  • 1MINES ParisTech, CEMEF - Centre de mise en forme des matériaux, CNRS UMR 7635, PSL - Research University, Sophia-Antipolis Cedex, France.

Journal of Microscopy
|November 27, 2018
PubMed
Summary
This summary is machine-generated.

Improving angular resolution in Electron Backscatter Diffraction (EBSD) analysis allows distinguishing between dynamically and post-dynamically recrystallized grains in Inconel 718 superalloys. Enhanced precision confirms subtle differences in dislocation content, crucial for material science applications.

Keywords:
Angular resolutionEBSDECCIrecrystallization

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Area of Science:

  • Materials Science
  • Metallurgy
  • Crystallography

Background:

  • Electron Backscatter Diffraction (EBSD) is a key technique for studying recrystallization.
  • Conventional EBSD struggles to differentiate between dynamic and post-dynamic recrystallized grains due to subtle dislocation content variations.

Purpose of the Study:

  • To investigate the impact of angular resolution on EBSD analysis for Inconel 718.
  • To demonstrate methods for improving EBSD angular resolution to distinguish recrystallized grain populations.

Main Methods:

  • Utilizing advanced Kikuchi pattern indexing and the Local Linear Automatic Smoothing Splines (LLASS) denoising filter to enhance EBSD angular resolution.
  • Performing EBSD analyses on Inconel 718 samples with varying dislocation densities.
  • Employing Electron Channeling Contrast Imaging (ECCI) for complementary analysis.

Main Results:

  • Improved EBSD angular resolution (0.1-0.2°) successfully distinguished between dynamically and post-dynamically recrystallized grains.
  • Quantified the coexistence of these two grain types within the Inconel 718 sample.
  • ECCI confirmed EBSD findings and revealed thermal stress-induced dislocations.

Conclusions:

  • Enhanced angular resolution in EBSD is critical for accurately characterizing recrystallization mechanisms.
  • The study confirms the presence of both dynamic and post-dynamic recrystallization in Inconel 718.
  • Improved EBSD techniques offer greater insight into microstructural evolution in superalloys.