Time-temperature-precipitation characteristics of high-nitrogen austenitic Fe-18Cr-18Mn-2Mo-0.9N steel

Tae Ho Lee, Sung Joon Kim, Setsuo Takaki

    研究成果: Contribution to journalArticle査読

    49 被引用数 (Scopus)

    抄録

    The time-temperature-precipitation (TTP) and corresponding mechanical properties in high-nitrogen austenitic Fe-18Cr-18Mn-2Mo-0.9N steel (all in weight percent) were investigated using electron microscopy and ambient tensile testing. The precipitation reactions can be categorized into three stages: (1) high-temperature region (above 950 °C) - mainly coarse grain-boundary (intergranular) Cr2N; (2) nose-temperature region-intergranular Cr2N → cellular Cr2N → intragranular Cr2N + sigma (σ); and (3) low-temperature region (below 750 °C) - intergranular Cr2N → cellular Cr2N → intragranular Cr2N + σ + chi (χ) + M7C3 carbide. After cellular Cr2N precipitation became dominant above 800 °C, yield and tensile strength gradually decreased, whereas elongation abruptly deteriorated with aging time. On the contrary, prolonged aging in the low-temperature regime increased tensile strength, caused by the precipitation of fine χ and M7C3 within grains. Based on the analyses of selected area diffraction (SAD) patterns, the crystallographic features of the second phases were analyzed.

    本文言語英語
    ページ(範囲)3445-3454
    ページ数10
    ジャーナルMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
    37
    12
    DOI
    出版ステータス出版済み - 12 1 2006

    All Science Journal Classification (ASJC) codes

    • 凝縮系物理学
    • 材料力学
    • 金属および合金

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