Precipitation characteristics of the second phases in high-nitrogen austenitic 18Cr-18Mn-2Mo-0.9N steel during isothermal aging

Tae Ho Lee, Chang Seok Oh, Chang Gil Lee, Sung Joon Kim, Setsuo Takaki

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    29 Citations (Scopus)

    Abstract

    Precipitation characteristics of the second phases and crystallographic features of Cr2N precipitates in high-nitrogen austenitic Fe-18Cr-18Mn-2Mo-0.9N (all in weight percent) alloy were investigated utilizing scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The precipitation sequence of Cr2N was found to be intergranular, cellular, and intragranular precipitation with aging time. On prolonged aging, coarse sigma (σ) phase with bct structure precipitated along cell and grain boundaries. Based on analyses of both SAD patterns and computer simulations of them, the crystal structure of Cr2N was confirmed to be trigonal, and the orientation relationship with γ can be expressed as [011]γ//[̄1100]Cr2N and (1̄11) γ//(0001)Cr2N.

    Original languageEnglish
    Pages (from-to)231-236
    Number of pages6
    JournalMetals and Materials International
    Volume10
    Issue number3
    Publication statusPublished - Jun 2004

    All Science Journal Classification (ASJC) codes

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

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