Abstract
To clarify the mechanism of plasma nitriding, we examined the optical microstructure, the hardness, the precipitation, and the concentration of dissolved nitrogen in Fe-18Cr-9Ni nitrided using plasma in the range of 723–823 K. Compared with ammonia-gas nitriding, the features of plasma nitriding are the formation of small chromium-nitride precipitates (CrN), the absence of an externally nitrided layer, the high concentration of dissolved nitrogen, and the high hardness (HV=1200). The diffusion coefficient of nitrogen in the present alloy was determined using the growth rate of the internally nitrided layer, based on calculations used in internal oxidation. Plasma- and gas-nitriding were also compared with respect to the growth rate of the nitrided layer.
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References
H. Miyamura, J. Takada, H. Kuwahara, and S. Kikuchi,J. Materials Sci. 21, 2514 (1986).
H. Matsumoto, H. Kuwahara, J. Takada, and M. Koiwa,Proceedings of Japan Inst. Metals (1987), p. 489.
J. Takada, Y. Oizumi, H. Miyamura, H. Kuwahara, and S. Kikuchi,Oxid. Met. 26, 19 (1986).
H. Knüppel, K. Bortzmann, and F. Eberhard,Stahl und Eisen 78, 1871 (1958).
H. Kuwahara, H. Matsuoka, J. Takada, Y. Tomii, S. Kikuchi, and I. Tamura,J. Materials Sci. (in press).
H. Kuwahara, J. Takada, and I. Tamura,Proceedings of the 7th International Symposium on Plasma Chemistry, C. J. Timmermans, ed. (International Union of Pure and Applied Chemistry, Eindhoven, 1985), p. 473.
H. Kuwahara, H. Matsuoka, J. Takada, Y. Tomii, S. Kikuchi, and I. Tamura,J. Materials Sci. 25, 4120 (1990).
J. F. Eckel and T. B. Cox,J. Materials 3, 605 (1968).
P. Rochegude and J. Foct,Proceedings of the International Conference, J. Foct and A. Hendry, eds. (organized by The Institute of Metals and The Société Française de Métallurgie and held at Lille in France on May 18–20, 1988, 1989), p. 444.
A. Fry,Stahl und Eisen 43, 1271 (1923).
S. Nishigori,Denki seikou (in Japanese)10, 305 (1934).
J. Takada, Y. Oizumi, H. Miyamura, H. Kuwahara, S. Kikuchi, and I. Tamura,J. Materials Sci. 21, 2493 (1986).
C. Wagner,Z. Elektrochem. 63, 773 (1959).
J. Takada, K. Kashiwagi, and M. Adachi,J. Materials Sci. 19, 3451 (1984).
R. Urao,J. Metal Finishing Soc. of Japan 29, 477 (1978).
M. F. Chung and Y. K. Lim,Scripta Metallurgica 20, 807 (1986).
P. Grieveson and E. T. Turkdogan,Trans. Metall. AIME 230, 407 (1964).
M. Blanter,Zhur. Tech. Fiziki. 20, 217 (1950).
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Kuwahara, H., Matsuoka, H., Takada, J. et al. Plasma nitriding of Fe-18Cr-9Ni in the range of 723–823 K. Oxid Met 36, 143–156 (1991). https://doi.org/10.1007/BF00938459
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DOI: https://doi.org/10.1007/BF00938459