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A study of the peculiarities of austenite during the formation of bainite

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Abstract

The formation of bainite in steel is generally accompanied by an enrichment in carbon of the adjacent austenite which can become remarkably stable as evidenced by its very slow transformation rate and its very lowM s point. This paper presents the results of a study of this residual austenite in an SAE-9262 steel. Both the carbon content and the amount of retained austenite have been determined as a function of transformation temperature. It has been shown that the carbon content of the enriched austenite passes through a maximum of 1.7 pct at a reaction temperature of 400°C. However, this remarkably high carbon content falls short of the one predicted by the Kinsman-Aaronson extrapolation of theA 3 curve thus indicating that the bainitic transformation cannot be considered simply as an extension of the proeutectoid transformation. In view of the inadequacy of the standard thermodynamics theory of theB s temperature, a kinetic point of view is proposed for the definition of this temperature.

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Authors and Affiliations

  1. Hydro-Quebec Institute of Research, Varennes, Quebec, Canada

    R. Le Houillier (Professor of Metallurgy) & G. Bégin (Research Staff Member)

  2. Department of Mines and Metallurgy, Laval University, Quebec

    A. Dubé (Profesor of Metallurgy)

Authors
  1. R. Le Houillier
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  2. G. Bégin
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  3. A. Dubé
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Le Houillier, R., Bégin, G. & Dubé, A. A study of the peculiarities of austenite during the formation of bainite. Metall Trans 2, 2645–2653 (1971). https://doi.org/10.1007/BF02814908

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  • DOI: https://doi.org/10.1007/BF02814908

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