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Quantitative analysis of martensite and bainite microstructures using electron backscatter diffraction.

Yongzhe Wang1, Jiajie Hua1, Mingguang Kong2

  • 1The State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China.

Microscopy Research and Technique
|June 25, 2016
PubMed
Summary
This summary is machine-generated.

Researchers developed a new electron backscatter diffraction (EBSD) method to quantify martensite and bainite phases in ultra-high-strength steels. This technique utilizes band contrast to differentiate phases, aiding material analysis.

Keywords:
bainiteband contrastelectron backscatter diffractionmartensitescanning electron microscopy

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Area of Science:

  • Materials Science
  • Metallurgy
  • Microscopy

Background:

  • Ultra-high-strength steels often feature multiphase microstructures, primarily martensite and bainite.
  • Accurate quantitative phase analysis is crucial for understanding steel properties.
  • Traditional methods may lack precision in differentiating similar phases.

Purpose of the Study:

  • To propose a novel, quantitative method for statistical phase analysis in multiphase steels.
  • To differentiate and quantify martensite and bainite phases using electron backscatter diffraction (EBSD).
  • To correlate cooling rates with phase proportions in ultra-high-strength steels.

Main Methods:

  • Utilized electron backscatter diffraction (EBSD) for microstructural analysis.
  • Developed a quantitative phase analysis approach based on band contrast.
  • Employed Gaussian two-peak fitting on band contrast profiles for phase differentiation.
  • Correlated band contrast with lattice imperfections in martensite and bainite.

Main Results:

  • Successfully determined the volume fractions of bainite and martensite in various steel samples.
  • Established a correlation between band contrast and the presence of martensite or bainite.
  • Demonstrated that higher cooling rates increase martensite proportion and the martensite-to-bainite ratio.

Conclusions:

  • The proposed EBSD-based band contrast method provides accurate quantitative phase analysis.
  • Lattice imperfections in martensite lead to lower band contrast compared to bainite.
  • Cooling rate is a critical parameter influencing the martensite and bainite balance in these steels.