Bainite in the light of rapid continuous cooling information

• Rapid continuous cooling of pure iron can produce three different transformations yielding acicular structures: Widmanstätten a, 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 a 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.

Nyckelord

Alloying; Bainitic transformations; Binary alloys; Carbon; Chromium; Cooling; Diffusion in solids; Growth (materials); Iron alloys; Nickel; Phase equilibria; Temperature; Acicular structures; Iron carbon alloys; Lath martensite; Lenticular martensite; Rapid continuous cooling; Solute drag effect; Widmanstatten; Bainite

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