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Influence of carbonitriding defects on fatigue strength of 25KhGT gear teeth

  • Chemicothermal Treatment
  • Published:
Metal Science and Heat Treatment Aims and scope

Conclusions

  1. 1.

    Carbonitriding defects — a spheroidite network, dark component, an elevated amount of carbides —reduce the fatigue limit of gear teeth.

    With the dark component at a depth of about 0.08 mm the fatigue limit of gear teeth made of steel 25KhGT decreases to approximately one half.

    A large number of coarse carbide inclusions at a depth of 0.05 mm and a spheroidite network at a depth of 0.2–0.3 mm lower the fatigue limit by almost 40%. The effect of spheroidite on the fatigue limit decreases with decreasing depth of the spheroidite.

  2. 2.

    The depth of the spheroidite varies with the amount of retained austenite and the nitrogen concentration of the case. An increase of the amount of retained austenite to 60% with an increase of the nitrogen concentration in the case ensures obtaining a structure without spheroidite and raises the fatigue limit of 25KhGT gear teeth after carbonitriding.

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Literature cited

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Authors
  1. V. I. Krylov
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  2. L. M. Semenova
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  3. B. Z. Slobin
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  4. G. E. Kucheruk
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Additional information

Volgograd Scientific-Research Institute of the Technology of Machine. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 12, pp. 33–37, December, 1971.

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Krylov, V.I., Semenova, L.M., Slobin, B.Z. et al. Influence of carbonitriding defects on fatigue strength of 25KhGT gear teeth. Met Sci Heat Treat 13, 1028–1032 (1971). https://doi.org/10.1007/BF00664999

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  • DOI: https://doi.org/10.1007/BF00664999

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