Formation of "carbide-free zones" resulting from the interplay of C redistribution and carbide precipitation during bainitic transformation

Thomas Klein, Christina Hofer, Marina Lukas, Tomasz Wojcik, Ronald Schnitzer, Matthew Galler, Gerald Ressel

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    Abstract

    Advanced bainitic steels exploit their constitution of a phase mixture of bainitic ferrite and retained austenite. The desired microstructures are usually adjusted via isothermal or continuous cooling treatments below the bainite-start-temperature. In the present work, we analyze the microstructural evolution during bainite formation in detail and we report on a novel mechanism for the formation of “carbide-free zones” in the close proximity of austenite. Carbides are formed in the interior of bainitic ferrite, which is isolated from surrounding austenite, while the depletion of C in the vicinity of austenite suppresses their formation.

    Original languageEnglish
    Article number100380
    JournalMaterialia
    Volume7.2019
    Issue numberSeptember
    DOIs
    Publication statusPublished - 23 Jun 2019

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