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Analyzing Boron in 9-12% Chromium Steels Using Atom Probe Tomography.

Irina Fedorova1, Flemming Bjerg Grumsen1, John Hald1

  • 1Department of Mechanical Engineering,Technical University of Denmark,DK-2800 Kgs. Lyngby,Denmark.

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
|January 31, 2019
PubMed
Summary

Adding small amounts of boron significantly enhances creep resistance in 9-12% Cr steels. Novel atom probe tomography methods were developed to overcome challenges in analyzing boron distribution in these steels.

Keywords:
TKDboridescarbidescustom-made specimen holderequilibrium segregationnon-equilibrium segregationprecipitatesprior austenite grain boundariesquantification

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Area of Science:

  • Materials Science
  • Metallurgy
  • Physical Chemistry

Background:

  • Boron additions improve long-term creep resistance in 9-12% Cr steels.
  • Mechanisms of boron segregation to grain boundaries and precipitates are not fully understood.
  • Atom probe tomography (APT) is crucial for analyzing boron distribution but faces challenges.

Purpose of the Study:

  • To develop and validate a site-specific APT specimen preparation method for 9-12% Cr steels.
  • To investigate boron distribution at grain boundaries and in precipitates using APT.
  • To address challenges in quantitative boron analysis in 9-12% Cr steels.

Main Methods:

  • Developed a novel site-specific APT specimen preparation technique.
  • Utilized APT to analyze boron segregation at grain boundaries and within precipitates.
  • Investigated boron distribution profiles and evaporation field effects.
  • Applied a 10B correction method for quantitative analysis of borides.

Main Results:

  • Successfully prepared APT specimens with targeted grain boundaries.
  • Observed a widening of boron distribution profiles at boundaries and in carbides/borides.
  • Analyzed the influence of evaporation fields on boron signal.
  • Achieved good quantification of boron in metal borides using 10B correction.

Conclusions:

  • The developed method facilitates site-specific APT analysis of boron in 9-12% Cr steels.
  • Understanding boron distribution is key to optimizing creep resistance.
  • Addressed key challenges in APT analysis of boron, improving quantification accuracy.