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

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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. 1.

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

  2. 2.

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

  3. 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).

  4. 4.

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

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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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Keywords

  • Fatigue
  • Martensite
  • Compressive Stress
  • Fatigue Life
  • Fatigue Failure