Abstract
Rapid continuous cooling of pure iron can produce three different transformations yielding acicular structures: Widmanstätten α, lath martensite, and lenticular martensite. The information on their extensions into binary systems with carbon, nickel, and chromium has been reviewed, and admittedly rough methods have been used for estimating growth rates in order to examine the role of diffusion. The effect of alloying elements on their plateau temperatures and growth rates indicates that Widmanstätten α in Fe-C alloys grows under conditions close to local equilibrium for carbon, and it is suggested that the same should hold for edgewise growth of bainite. In Fe-Ni alloys, there are indications that Widmanstätten α grows under a considerable solute drag, an effect which may also occur for bainite. In Fe-Cr alloys, the solute drag effect seems to be weaker but may increase with the carbon content.
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This article is based on a presentation made during TMS/ASM Materials Week in the symposium entitled “Atomistic Mechanisms of Nucleation and Growth in Solids,” organized in honor of H.I. Aaronson’s 70th Anniversary and given October 3–5, 1994 in Rosemont, Illinois.
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Borgenstam, A., Hillert, M. Bainite in the light of rapid continuous cooling information. Metall Mater Trans A 27, 1501–1512 (1996). https://doi.org/10.1007/BF02649810
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DOI: https://doi.org/10.1007/BF02649810