The role of silicon in carbon partitioning processes in martensite/austenite microstructures

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    Abstract

    Understanding carbon redistribution in steels is crucial in developing advanced high strength steels. For instance, Quenching & Partitioning (Q&P) processes rely on the partitioning of carbon from martensite into austenite, where at the end of the heat treatment the carbon-enriched austenite shows higher stability at room temperature. Recent literature gives increasing evidence of carbide precipitation occurring during partitioning despite the addition of silicon, conventionally thought to suppress carbide precipitation. The aim of the present study is to gain insight into carbon-competing processes by applying a series of Q&P heat treatments, with particular focus on the partitioning stage, where the role of silicon in the stability of austenite is evaluated. Various characterisation techniques are combined in order to unveil the microstructural changes. While carbide precipitation does appear to occur in the presence of silicon, it is found that silicon plays an active role in the stabilisation of the austenite during the partitioning reaction.

    Original languageEnglish
    Pages (from-to)336-345
    JournalMaterials & Design
    Volume127
    DOIs
    Publication statusPublished - 2017

    Keywords

    • Atom probe tomography (APT)
    • Austenite stability
    • Carbon
    • Martensite
    • X-ray diffraction (XRD)

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