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

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Abstract

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—integranular 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.

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Authors and Affiliations

  1. ECO-Materials Research Center, Korea Institute of Machinery and Materials, 641-010, Changwon, Korea

    Tae-Ho Lee (Senior Researcher) & Sung-Joon Kim (Principal Researcher)

  2. Department of Materials Science and Engineering, Kyushu University, 819-0395, Fukuoka, Japan

    Setsuo Takaki (Professor)

Authors
  1. Tae-Ho Lee
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  2. Sung-Joon Kim
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  3. Setsuo Takaki
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Lee, TH., Kim, SJ. & Takaki, S. Time-temperature-precipitation characteristics of high-nitrogen austenitic Fe−18Cr−18Mn−2Mo−0.9N steel. Metall Mater Trans A 37, 3445–3454 (2006). https://doi.org/10.1007/s11661-006-1040-8

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  • DOI: https://doi.org/10.1007/s11661-006-1040-8

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