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On the influence of carbide formation upon the growth kinetics of proeutectoid ferrite in Fe-C-X alloys

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Abstract

In the preceeding paper, the growth kinetics of grain boundary ferrite allotriomorphs in Fe-C-Si, Fe-C-Mn, Fe-C-Ni, and Fe-C-Cr alloys are reported to be best described by the paraequilibrium model. Significant differences are still observed, however, between the experimentally measured kinetics and those calculated from this model. A TEM study was conducted on these alloys to ascertain whether any of these differences could be attributed to carbide precipitation. In the Fe-C-Mn and Fe-C-Cr alloys, where the measured growth kinetics are low, carbides precipitate on dislocations within the ferrite and are effectively absent, respectively; hence carbide precipitation cannot be responsible for the deviations in these alloys. In the low Ni, Fe-C-Ni alloy, where calculated and measured kinetics agree, carbide precipitation was again found on dislocations in the ferrite. Faster than calculated growth kinetics in the Fe-C-Si and the high Ni, Fe-C-Ni alloys, on the other hand, are attributed in part to carbide precipitation at austenite:ferrite boundaries.

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Authors and Affiliations

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

    G. J. Shiflet (Assistant Professor)

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

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

  3. Physics Department, General Motors Research Laboratories, 48090, Warren, MI

    J. R. Bradley

Authors
  1. G. J. Shiflet
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  2. H. I. Aaronson
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  3. J. R. Bradley
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Additional information

Formerly Republic Steel Fellow, Department of Metallurgical Engineering, Michigan Technological University, Houghton, MI 49931 and Visiting Graduate Student, Carnegie-Mellon University, Pittsburgh, PA 15213

Formerly Professor, Department of Metallurgical Engineering, Michigan Technological University

Formerly Graduate Student, Department of Metallurgical Engineering, Michigan Technological University

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Shiflet, G.J., Aaronson, H.I. & Bradley, J.R. On the influence of carbide formation upon the growth kinetics of proeutectoid ferrite in Fe-C-X alloys. Metall Trans A 12, 1743–1750 (1981). https://doi.org/10.1007/BF02643756

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  • DOI: https://doi.org/10.1007/BF02643756

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