Atom probe field ion microscopy study of the partitioning of substitutional elements during tempering of a low-alloy steel martensite

S. S. Babu, K. Hono, T. Sakurai

    Research output: Contribution to journalArticle

    83 Citations (Scopus)

    Abstract

    The partitioning behavior of Mn and Si at the cementite/ferrite interface during tempering of Fe-C-Si-Mn steel martensite has been studied by atom probe field-ion microscopy (APFIM). It has been shown that cementite can form without partitioning of Si and Mn during the early tempering stage at a low temperature. The atom probe compositional analysis shows no evidence of segregation or of concentration spikes of substitutional elements at the interface. This suggests that the early stage of cementite growth occurs by paraequilibrium mode and is controlled only by C diffusion in the matrix. In addition, significant C concentration fluctuations are measured in the as-quenched condition. The onset of partitioning of both Si and Mn occurs after prolonged time or by increasing the tempering temperature.

    Original languageEnglish
    Pages (from-to)499-508
    Number of pages10
    JournalMetallurgical and Materials Transactions A
    Volume25
    Issue number3
    DOIs
    Publication statusPublished - 1994 Mar 1

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Mechanics of Materials
    • Metals and Alloys

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