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Features of the micromechanism of failure of cast steels in the process of fatigue crack propagation

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Conclusions

  1. 1.

    The structure of quenching sorbite has greater resistance to fatigue crack propagation in the cast steels type 20GL and 20GFL than the ferrite-pearlite mixture after normalization.

  2. 2.

    The existence of macropores and micropores in cast metal does not affect the speed of fatigue crack propagation.

  3. 3.

    Spalling with a large number of secondary microcracks is a more energy consuming process than failure involving the formation of fatigue grooves.

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Literature cited

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    N. I. Kornev and L. N. Kosarev, "The effect of the heat-treatment regimes on the fatigue crack resistance of low-carbon cast steels 20GL and 20GFL," Metalloved. Term. Obrab. Met., No. 8, 8–12 (1983).

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    S. A. Saltykov, Stereometric Metallography [in Russian], Metallurgiya, Moscow (1976).

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    M. M. Gol'dshtein and V. M. Farber, Dispersion Hardening of Steel [in Russian], Metallurgiya, Moscow (1976).

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    S. S. Gorelik, L. N. Rastorguev, and Yu. A. Skakov, Radiographic and Electron Optical Analysis [in Russian], Metallurgiya, Moscow (1970).

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    N. I. Kornev and L. N. Kosarev, "Estimate of the indispensable number of measurements in fractographic investigation of fatigue fractures," in: Collection of the All-Union Research Institute of Railroad Engineering: Fatigue Crack Resistance of Metallic Materials and Structural Elements of Means of Transport and Transport Equipment [in Russian], Transport, Moscow (1984), pp. 54–61.

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

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    L. R. Botvina and T. V. Klevtsov, "The kinetics of development of plastic deformation during fatigue failure of steel 20," Fiz. Khim. Mekh. Mater.,19, No. 1, 39–44 (1983).

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    M. N. Georgiev, N. Ya. Mezhova, L. P. Strok, and N. K. Shaurova, "The application of x ray fractography in the study of the regularities of the failure of metals," Zavod. Lab.,47, No. 8, 54–58 (1981).

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    L. E. Miller and G. G. Smith, "Tensile fractures in carbon steels," J. Iron Steel Inst.,208 No. 11, 998–1005 (1970).

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Additional information

All-Union Research Institute of Railroad Engineering. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 3, pp. 24–27, March, 1986.

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Kornev, N.I., Kosarev, L.N. & Strok, L.P. Features of the micromechanism of failure of cast steels in the process of fatigue crack propagation. Met Sci Heat Treat 28, 189–194 (1986). https://doi.org/10.1007/BF00705389

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Keywords

  • Fatigue
  • Fatigue Crack
  • Sorbite
  • Fatigue Crack Propagation
  • Great Resistance