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Internal sulfide precipitation in low Cr-Fe alloys

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Abstract

The present article examines the internal sulfide precipitation in low Cr-Fe alloys that resulted from solid-state diffusion experiments at 600 °C. The internal sulfide precipitate microstructure is shown in alloys ranging from 11.3 wt pct Cr to 51.1 wt pct Cr. The diffusion composition profile and sulfide phase compositions have been measured using electron probe microanalysis (EPMA). Based on the microprobe data and some calculations using established internal sulfidation theory, a description of the internal sulfide precipitation sequence and depth is explained and the sulfide precipitate morphology is quantified. The solid-state diffusion experiments indicate that the optimum Cr composition range for sulfidation resistance at 600 °C is between 20 and 40 wt pct Cr. The results have also been compared with existing low-temperature gas-solid sulfidation literature and the differences in results are explained.

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Authors and Affiliations

  1. Nuclear Metals, Inc., 01742, Concord, MA

    B. J. Smith (Research Engineer)

  2. University of Massachusetts, 01003, Amherst, MA

    J. I. Goldstein (Dean of Engineering)

  3. Lehigh University, 18015, Bethlehem, PA

    A. R. Marder (Professor of Materials Science and Engineering)

Authors
  1. B. J. Smith
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  2. J. I. Goldstein
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  3. A. R. Marder
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Additional information

Formerly Graduate Student, Department of Materials Science and Engineering, Lehigh University

Formerly Stout Professor of Materials Science and Engineering, Lehigh University

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Smith, B.J., Goldstein, J.I. & Marder, A.R. Internal sulfide precipitation in low Cr-Fe alloys. Metall Mater Trans A 27, 3192–3202 (1996). https://doi.org/10.1007/BF02663870

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  • DOI: https://doi.org/10.1007/BF02663870

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