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Influence of Interfacial Structure upon Carbide Precipitation at Austenite : Ferrite Boundaries in an Fe-C-Mo Alloy

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Abstract

During conventional isothermal transformation of an Fe-0.11 pct C-1.95 pct Mo alloy, eutectoid decomposition occurs by the interphase boundary carbide precipitation and the fibrous carbide mechanisms at 770° to 825 °C. When proeutectoid ferrite is formed and then recrystallized within the α + γ region, and subsequently further transformed at 770° to 825 °C, however, both of these eutectoid decomposition mechanisms are rendered inoperative. Carbide precipitation occurs instead entirely as isolated particles. This result supports the deduction that carbide precipitation at austenite : ferrite boundaries can occur only when these boundaries are locally immobilized by a partially coherent interfacial structure. A general approach to explaining the development of planar and curved interphase boundary precipitation, fibrous structure, and pearlite is developed in terms of two crystallographic factors.

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Authors and Affiliations

  1. Research Laboratories, Kawasaki Steel Corporation, 1 Kawasaki-cho, 260, Chiba, Japan

    T. Obara

  2. Department of Materials Science, University of Virginia, 22901, Charlottesville, VA

    G. J. Shiflet (Assistant Professor)

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

    H. I. Aaronson (R. F.Mehl Professor)

Authors
  1. T. Obara
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  2. G. J. Shiflet
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  3. H. I. Aaronson
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Additional information

Formerly Research Associate in the Department of Metallurgical Engineering, Michigan Technological University, Houghton, MI 49931 and the Department of Metallurgical Engineering and Materials Science, Carnegie-Mellon University, Pittsburgh, PA 15213

Formerly Graduate Student, Michigan Technological University, and Visiting Graduate Student, Camegie-Mellon University

Formerly Professor at Michigan Technological University

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Obara, T., Shiflet, G.J. & Aaronson, H.I. Influence of Interfacial Structure upon Carbide Precipitation at Austenite : Ferrite Boundaries in an Fe-C-Mo Alloy. Metall Trans A 14, 1159–1167 (1983). https://doi.org/10.1007/BF02659863

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  • DOI: https://doi.org/10.1007/BF02659863

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