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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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