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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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Conclusions

  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

  1. 1.

    B. A. Potekhin and I. N. Bogachev, "The relaxation of stresses in 30Kh10G10 chromemanganese austenitic steel," Fiz. Met. Metalloved.,18, No. 5, 257 (1964).

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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. Hornbogen, Acta Met.,26, 147 (1978).

  5. 5.

    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.

  7. 7.

    Yu. K. Kovneristyi and V. M. Blinov, "The resistance to crack propagation of dispersion hardening austenitic steel, "Metalloved. Term. Obrab. Met., No. 1, 52 (1971).

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    V. S. Ivanova and V. F. Terent'ev, The Nature of the Fatigue of Metals [in Russian], Metallurgiya, Moscow (1975).

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    T. Ekobori, The Failure Physics and Mechanics and the Strength of Solids [in Russian], Metallurgiya, Moscow (1971).

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    N. Hasegawa, J. Kato, and M. Nakajima, Bull. JSME,21, No. 152, 181 (1978).

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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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Keywords

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