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The characteristics of high temperature Gas Nitriding heat treatment and tempering in 0.8Mo added 17Cr-1Ni-0.5C

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Abstract

The effect of the High Temperature Gas Nitriding (HTGN) and tempering treatment of 17Cr-1Ni-0.5C-0.8Mo (CNMo) steel was experimentally investigated. The HTGN was carried out at 1050 °C for 1 h in a gaseous atmosphere containing 98.07 kPa of nitrogen. Chromium nitrides in the austenite and martensite phase appeared at the nitrogen-permeated surface layer after the HTGN treatment. The hardness of the outmost surface of the HTGN treated specimen measured 708 Hv. When it was tempered at 500 °C for 1 h, the hardness of the outmost surface was 763 Hv as a result of the precipitation of mostly micro Cr2N, which was densely packed with a small amount of Cr23C6 and the secondary hardening effect. In addition, an improvement in the corrosion resistance was observed in the tempered specimen.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Dong-A University, 840 Hadan-dong, Saha-gu, Busan, 604-714, Korea

    J. H. Kong, D. J. Lee, H. Y. On, S. H. Lee, J. H. Sung & H. W. Lee

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  1. J. H. Kong
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  2. D. J. Lee
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  3. H. Y. On
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  4. S. H. Lee
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  5. J. H. Sung
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  6. H. W. Lee
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Correspondence to H. W. Lee.

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Kong, J.H., Lee, D.J., On, H.Y. et al. The characteristics of high temperature Gas Nitriding heat treatment and tempering in 0.8Mo added 17Cr-1Ni-0.5C. Met. Mater. Int. 15, 179–185 (2009). https://doi.org/10.1007/s12540-009-0179-4

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  • DOI: https://doi.org/10.1007/s12540-009-0179-4

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