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Tempering and Precipitation Behavior of 7 Pct Cr-0.1 Pct V-0.06 Pct Nb-0.08 Pct N Steel

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Abstract

In order to clarify the tempering and precipitation behavior of carbon-free and nitrogen-bearing high-chromium martensitic steel, an experimental steel was newly designed and examined precisely. Tempering was performed at 650 °C to 800 °C for a maximum of 1000 hours. In addition to the general trend of recovery, discontinuous changes in hardness and bulk X-ray properties were observed during the tests. Fine particles of the NaCl type (MX) and coarse, platelike Cr2N particles containing small amounts of V and Nb were observed. The average chemical composition of MX changed from (Cr0.65V0.25Nb0.1)N to (Cr0.35V0.45Nb0.2)N, with the progress of tempering. Even after tempering at 750 °C for 1000 hours, the chemical composition of the MX was distributed widely around the average value. The size of the MX nitride gradually increased from 20 to 60 nm in 1000 hours at 750 °C, and the apparent time exponent was roughly 0.25. When the discontinuous changes in hardness were observed, the amount of both the MX and the Cr2N and the composition of the MX changed, discontinuously. This suggested that, accompanying the formation of subgrains during tempering, the particles precipitated on the boundaries repeatedly dissolved into the matrix, followed by reprecipitation.

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Acknowledgments

The authors gratefully acknowledge Dr. Toshiyasu Nishimura, NKK Co. (JFE Steel), for supplying the experimental steel. The authors are also grateful to Mr. Anoop Kabadwal, a student of the graduate school of the National Defense Academy, for preparing the manuscript.

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Author notes

  1. M. Nakamura

    Present address: Japan Ground Self Defense Force, Shizuoka, 2398686, Japan

Authors and Affiliations

  1. M&E Department, National Defense Academy, Yokosuka-shi, 2398686, Japan

    M. Tamura (Professor), K. Shinozuka (Research Associate) & H. Esaka (Professor)

  2. Graduate School, National Defense Academy, Yokosuka-shi, Japan

    M. Nakamura

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  1. M. Tamura
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  2. M. Nakamura
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  3. K. Shinozuka
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  4. H. Esaka
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Corresponding author

Correspondence to H. Esaka.

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Manuscript submitted April 1, 2007.

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Tamura, M., Nakamura, M., Shinozuka, K. et al. Tempering and Precipitation Behavior of 7 Pct Cr-0.1 Pct V-0.06 Pct Nb-0.08 Pct N Steel. Metall Mater Trans A 39, 1060–1076 (2008). https://doi.org/10.1007/s11661-008-9486-5

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  • DOI: https://doi.org/10.1007/s11661-008-9486-5

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