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Precipitation kinetics of carbides during cyclical and isothermal aging of 2.25Cr–1Mo steel and its effect on mechanical properties

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Abstract

The carbide precipitation was analyzed during aging of 2.25Cr–1Mo steel at 550 °C. The as-received steel was aged in two different manners: the first treatment was an isothermal aging at 550 °C for time up to 1000 h, and the second one was carried out by a cyclical aging, which consisted of aging at 550 °C for 1 h, water quenching at room temperature and then newly heating at 550 °C. This procedure was repeated up to 300 times. The M23C6 and M6C carbide precipitation took place intragranularly and intergranularly for both aging treatments. The carbide coarsening was detected to occur with the increasing aging time. Nevertheless, the growth kinetics of precipitation occurred more rapidly in the case of cyclical aging. The specimen hardness decreased with the aging time in both cases; however, it occurred in shorter aging time for the cyclical aging. Nanoindentation testing indicated the increase in ductility with the aging time, and the cyclically aged specimens showed larger ductility than the isothermally aged specimens.

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Acknowledgements

The author wishes to acknowledge the financial support from Secretaría de Investigación y Posgrado-Instituto Politecnico Nacional and Consejo Nacional de Ciencia y Tecnología A1-S-9682. Special thanks are due to R. Gomez for technical assistance and V. Lopez for Thermo-Calc calculations.

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  1. ESIQIE, Instituto Politécnico Nacional, Mexico, 07300, Mexico

    Maribel Leticia Saucedo-Muñoz

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  1. Maribel Leticia Saucedo-Muñoz
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Correspondence to Maribel Leticia Saucedo-Muñoz.

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Saucedo-Muñoz, M.L. Precipitation kinetics of carbides during cyclical and isothermal aging of 2.25Cr–1Mo steel and its effect on mechanical properties. J. Iron Steel Res. Int. 28, 1282–1290 (2021). https://doi.org/10.1007/s42243-021-00610-5

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  • DOI: https://doi.org/10.1007/s42243-021-00610-5

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