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Evaluation of the effects of segregation on austenite grain boundary energy in Fe-C-X alloys

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Abstract

A scanning Auger microprobe study has been made of the segregation of substitutional alloying elements to austenite grain boundaries in Fe-C-X alloys (where X = Mn, Ni, Si, Co, and Mo). The grain boundary enrichments in X are considerably smaller than those previously estimated from the thermal grooving method but appear consistent with other SAM results in the literature. Mo exhibits the highest enrichment factor, those for Si and Mn are intermediate, and no appreciable grain boundary enrichment of either Co or Ni is observed. In view of the special relevance of this information to nucleation kinetics of austenite decomposition products at austenite grain boundaries, the reductions in grain boundary energy attending the measured enrichments are evaluated using the model of interactive segregation of interstitial and substitutional solutes formulated by Guttmann and McLean. These calculations were performed under two different (limiting) conditions: (i) equilibrium segregation of both solutes is fully achieved at the isothermal reaction temperatures, and (ii) the boundary concentration of X is fully inherited from the austenitizing temperature and only paraequilibrium segregation of carbon is achieved. Various characteristics of interactive segregation are also discussed in terms of the interaction and binding energies of each solute.

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Authors and Affiliations

  1. National Research Institute for Metals, 2-3-12, Nakameguro, Meguroku, 153, Tokyo, Japan

    M. Enomoto

  2. Department of Metallurgical Engineering, Michigan Technological University, 49931, Houghton, MI

    C. L. White (Professor)

  3. Department of Metallurgical Engineering and Materials Science, Carnegie Mellon University, 15213, Pittsburgh, PA

    H. I. Aaronson (Mehl Professor)

Authors
  1. M. Enomoto
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  2. C. L. White
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  3. H. I. Aaronson
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Additional information

Formerly a Graduate Student, Department of Metallurgical Engineering and Materials Science, Carnegie Mellon University, Pittsburgh, PA15213

Formerly with Oak Ridge National Laboratory, Oak Ridge, TN 37830

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Enomoto, M., White, C.L. & Aaronson, H.I. Evaluation of the effects of segregation on austenite grain boundary energy in Fe-C-X alloys. Metall Trans A 19, 1807–1818 (1988). https://doi.org/10.1007/BF02645149

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