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Influence of explosive loading on the micromechanisms of fallure of constructional steels

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Metal Science and Heat Treatment Aims and scope

Conclusions

  1. 1.

    Explosive loading with p=5 and 10 GPa of specimens of St3sp and 20G2S steels leads in subsequent impact bend tests to complication of their fracture relief and to an increase in the degree of microlocal deformation, as the result of which the energy expenditure for the failure process may increase. The increase in relief is caused by complication of the trajectory of the crack, the development of which is a discrete process. The microcracks and then the main crack propagate in jump, the length of which is determined by the specific structure of the material.

  2. 2.

    The combination of explosive loading with subsequent heat treatment substantially increase the brittle fracture resistance of the investigated steels at low temperatures as the result of decreasing localization and more uniform occurrence of deformation and fracture. Explosive and heat treatment provides the optimum mechanical properties of steels [5, 6] and may be used when traditional methods of hardening and thermomechanical treatment are inapplicable.

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Literature cited

  1. I. N. Gavril'ev and T. M. Sobolenko, "The brittle fracture resistance of low-carbon and low-alloy steels after the action of shock waves," in: The Physics and Mechanics of Fracture of Materials at Reduced Temperatures [in Russian], Yakutsk (1978), p. 135.

  2. I. N. Gavril'ev, A. A. Deribas, and T. M. Sobolenko, "The brittle fracture resistance of steels after explosive and heat treatment," in: Papers for the Fourth Symposium on the Use of Explosive Energy for the Creation of a Materials with New Properties [in Russian], Gottwaldov, Czechoslovakia (1979), p. 358.

  3. S. P'yu, "Fractography in connection with fracture toughness and structure," in: The Fracture Toughness of High-Strength Materials [in Russian], Metallurgiya, Moscow (1973), p. 129.

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  4. A. N. Vergazov and V. V. Rybin, "Retarding of a microcrack in a subgrain structure," Fiz. Met. Metalloved.,39, No. 1, 220 (1975).

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  5. I. N. Gavril'ev, A. A. Deribas, and T. M. Sobolenko, Izv. Akad. Nauk SSSR, Mekh. Tverd. Tela, No. 2, 174 (1979).

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  6. N. V. Berezina, V. F. Grabin, V. M. Kudinov, et al., Avtomat. Svarka, No. 6, 8 (1974).

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Authors
  1. I. N. Gavril'ev
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  2. T. M. Sobolenko
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  3. S. P. Yakovleva
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Additional information

Translated from Metallovedenie i Termicheskaya Obrabotka Metallov. No. 12, pp. 20–22, December, 1986.

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Gavril'ev, I.N., Sobolenko, T.M. & Yakovleva, S.P. Influence of explosive loading on the micromechanisms of fallure of constructional steels. Met Sci Heat Treat 28, 877–881 (1986). https://doi.org/10.1007/BF00706604

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  • DOI: https://doi.org/10.1007/BF00706604

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