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Influence of grain size and γ-phase stability on the fatigue limit of high-strength austenitic steels

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  1. 1.

    The high fatigue strength of N26KhT1 metastable austenitic steel is caused not only by strengthening as a result of phase strain hardening and aging but also by the instability of the Fe−Ni−Ti austenite.

  2. 2.

    An increase in grain size leads to a reduction in the fatigue limit of N26KhT1 and 40G18Yu3F steels. The fatigue limit of 40G18Yu3F stable dispersion hardening steel is more sensitive to a change in grain size.

  3. 3.

    The straight-line relationship of the fatigue strength of N26KhT1 and 40G18Yu3F steels to grain size, described by the Hall-Petch equation, has a break, which is caused by a change in the character of failure in the transition from the fine- to the coarse-grained condition of the steel.

  4. 4.

    The low-cycle fatigue strength of N26KhT1 steel is practically independent of grain size.

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Literature cited

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    A. I. Uvarov and P. P. Karpov, "The fatigue strength of dispersion hardening high-alloy steels," Metalloved. Term. Obrab. Met., No. 5, 5 (1978).

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    C. Altstetter and D. Hennessy, Proceedings of the Third International Conference on the Strength of Metals, Cambridge,1, No. 89, 447 (1973).

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    E. I. Shchedrin, V. V. Sagaradze, and K. A. Malyshev, "The physicomechanical and technological properties of N26KhT1 austenitic steel," in: High-Strength Nonmagnetic Steels [in Russian], Nauka, Moscow (1978), p. 200.

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    Yu. A. Avetesyan and V. G. Gorbach, "Phase strain hardening as a method of increasing the fatigue strength of austenitic alloys," in: High-Strength Nonmagnetic Steels [in Russian], Nauka, Moscow (1978), p. 117.

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Additional information

Institute of Metal Physics, Ural Scientific Center, Academy of Sciences of the USSR. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 5, pp. 46–50, May, 1981.

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Shchedrin, E.I., Sagaradze, V.V. & Malyshev, K.A. Influence of grain size and γ-phase stability on the fatigue limit of high-strength austenitic steels. Met Sci Heat Treat 23, 354–359 (1981). https://doi.org/10.1007/BF00700551

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  • Grain Size
  • Fatigue
  • Austenite
  • Strain Hardening
  • Fatigue Strength