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Nonequilibrium solute segregation to austenite grain boundaries in low alloy ferritic and austenitic steels

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Abstract

Nonequilibrium segregations of substitutional solute and impurity elements to austenite grain boundaries during cooling from the austenitizing temperature have been measured in thin foil specimens of ferritic 2.25 pct Cr 1 pct Mo, 2.25 pct Cr 1 pct Mo 0.08 pct Sn and austenitic Type 316 steels using scanning transmission electron microscopy combined with energy dispersive X-ray spectrometry (STEM-EDS). The results are discussed and compared with the predictions of a theoretical analysis which describes the segregation in terms of a quench-induced diffusion of vacancy-solute atom pairs to the grain boundaries.

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Authors and Affiliations

  1. Scientific Services Department, Central Electricity Generating Board, South Eastern Region, Gravesend, Kent, UK

    P. Doig (Acting Section Head) & P. E. J. Flew (Acting Branch Manager)

Authors
  1. P. Doig
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  2. P. E. J. Flew
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Doig, P., Flew, P.E.J. Nonequilibrium solute segregation to austenite grain boundaries in low alloy ferritic and austenitic steels. Metall Trans A 18, 399–406 (1987). https://doi.org/10.1007/BF02648800

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