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The increase of the fatigue strength of tractor gears with optimal carbonitriding

  • All-Union Conference on Modern Methods of Strengthening Machine Parts by Heat Treatment
  • Published:
Metal Science and Heat Treatment Aims and scope

Conclusions

  1. 1.

    The durability of carbonitrided machine parts depends to a considerable extent on the depth of surface defects. When the depth of troostite precipitates is reduced from 0.25 to 0.020 mm the nonbreaking load (bending) almost doubles.

  2. 2.

    The absence of dark components as well as reduction of the zone of nonmartensitic decomposition of austenite improves the contact strength of carbonitrided machine parts.

  3. 3.

    Adoption of the recommendations from this work will substantially improve the quality of the carbonitrided case and increase the durability of gears.

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Literature cited

  1. V. I. Krylov et al., "Effect of defects in carbonitriding on the fatigue strength of gear teeth of steel 25KhGT," Metal. i Term. Obrabotka Metal., No. 12, 23 (1971).

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  7. V. D. Kal'ner and S. A. Yurasov, "Internal oxidation of steel during chemicothermal treatment in endothermal atmospheres," in: Materials of the Seminar on Controlled Atmospheres [in Russian], MDNTP, Moscow (1971), p. 99.

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Authors
  1. L. M. Semenova
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  2. V. A. Tel'dekov
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  3. E. I. Tesker
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Additional information

Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 9, pp 26–28, September, 1973.

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Semenova, L.M., Tel'dekov, V.A. & Tesker, E.I. The increase of the fatigue strength of tractor gears with optimal carbonitriding. Met Sci Heat Treat 15, 756–758 (1973). https://doi.org/10.1007/BF00656286

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  • DOI: https://doi.org/10.1007/BF00656286

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