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Improving the quality of the nitrided layer of heavy-duty gear wheels

  • Heat-Treatment Technology
  • Published:
Metal Science and Heat Treatment Aims and scope

Conclusions

  1. 1.

    Raising the temperature at the period of saturation to 920°C, with the other technological parameters of nitriding retained, ensures that the hardened layer contains more carbon and nitrogen. At the same time the thickness of the layer increases by 20–25%, the hardenability of the saturated layer increases considerably, and in consequence the effective thickness of the layer increases 2.5–3.0 times.

  2. 2.

    Pulsating feed of natural gas (ammonia) to the working space of the furnace in nitriding, with a slight increase of their total expenditure, leads to increased carbon and nitrogen concentration in the diffusion layer and to its increased hardenability. The increase of the total thickness of the layer attains 20%, and the effective thickness of the hardened layer more than doubles.

  3. 3.

    The results of the industrial tests of the new nitriding regimes of gear wheels of steels 18KhGT and 30KhGT in a muffleless furnace designed at the Scientific and Production Association "VNIITMASh" were such that they can be recommended for the hardening of heavy-duty gear wheels for a wide variety of purposes.

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Literature cited

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Authors
  1. L. V. Sosonnaya
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  2. V. A. Tel'dekov
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  3. E. M. Andrianova
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  4. G. T. Bondar'
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  5. A. F. Fursova
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Additional information

Scientific and Production Association "VNIITMASh"; Production Association "Lipetskii Traktornyi Zavod." Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 1, pp. 3–6, January, 1991.

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Sosonnaya, L.V., Tel'dekov, V.A., Andrianova, E.M. et al. Improving the quality of the nitrided layer of heavy-duty gear wheels. Met Sci Heat Treat 33, 6–9 (1991). https://doi.org/10.1007/BF00775023

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  • DOI: https://doi.org/10.1007/BF00775023

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