Quantitative analysis of grain boundaries in carbon- and nitrogen-added ferritic steels by atom probe tomography

Jun Takahashi, Kazuto Kawakami, Kohsaku Ushioda, Setsuo Takaki, Nobuo Nakata, Toshihiro Tsuchiyma

    Research output: Contribution to journalArticlepeer-review

    34 Citations (Scopus)

    Abstract

    Recent reports state that solute carbon increases the Hall-Petch coefficient in ferritic steel through grain boundary segregation, whereas solute nitrogen has hardly any affect. Atom probe analysis of grain boundaries was performed to investigate why nitrogen has negligible influence. Nitrogen segregation at the boundary was clearly observed with a similar amount of carbon segregation in ferritic steel containing 5C-54 N (mass ppm). Quantitative estimation of the coefficient increment per unit interfacial excess implies that grain boundary segregation of nitrogen barely influences the Hall-Petch coefficient.

    Original languageEnglish
    Pages (from-to)207-210
    Number of pages4
    JournalScripta Materialia
    Volume66
    Issue number5
    DOIs
    Publication statusPublished - Mar 1 2012

    All Science Journal Classification (ASJC) codes

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering
    • Metals and Alloys

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