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Change of structure and properties of iron-nickel alloys in shot-impact hardening

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Metal Science and Heat Treatment Aims and scope

Conclusions

  1. 1.

    The changes in the martensite substructure of the surface layer have a determining effect on the contact fatigue life of N22 and 25N20 alloys subjected to shot-impact treatment (SH).

  2. 2.

    An increase in the contact life of iron-nickel alloys is attained in a narrow range of SH regimes, which ensure alongside with strengthening and creation of high residual compressive stresses a more stable structure, being characterized by a lowered level of microdistortions and low mobility of dislocations.

  3. 3.

    It is recommended to combine the shot-impact treatment of iron-nickel alloys with subsequent low-temperature annealing at which martensite hardening takes place as a result of strain aging and reduction of microdistortions which facilitate increase of resistance to contact fatigue failure.

  4. 4.

    The structure of iron-nickel alloys is similar to the martensite structure of the carbonized layers of gears. This permits the assumption of a similar mechanism of the effect of SH on carbonized gears. The results of this investigation can be used in developing SH regimes for gears.

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Literature cited

  1. N. M. Ryzhov, „Regularities in the change of contact life of carbonized gears in shotimpact hardening,” Vestn. Mashinostr., No. 10, 30–34 (1985).

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  2. M. A. Balter, Strengthening of Machine Parts [in Russian], Mashinostroenie, Moscow (1978).

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  3. N. M. Ryzhov, A. A. Gulyaev, and S. A. Pakhomova, „Structure and contact life of cemented 12Kh2N3A steel after PPD,” MITOM, No. 3, 30–33 (1986).

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  4. V. S. Ivanova and A. A. Shanyavskii, Quantitative Fractography [in Russian], Metallurgiya, Chelyabinsk (1988).

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Authors
  1. S. A. Pakhomova
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  2. N. M. Ryzhov
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Additional information

Moscow State Technical University. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 6, pp. 23–25, June, 1990.

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Pakhomova, S.A., Ryzhov, N.M. Change of structure and properties of iron-nickel alloys in shot-impact hardening. Met Sci Heat Treat 32, 422–426 (1990). https://doi.org/10.1007/BF01100160

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  • DOI: https://doi.org/10.1007/BF01100160

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