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Influence of preliminary cyclic loading on the resistance to failure of 16G2AF low-alloy steel

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  1. 1.

    Preliminary loading of 16G2AF steel has a marked influence on its resistance to brittle fracture. The character of this influence is determined by the stage of preceding cyclic loading. The maximum degree of embrittlement (a 10–20°C increase in T50) is observed after loading to a number of cycles of\(\bar N\)=10% and more of the expected life, which is significantly (by two or four times) less than for low-carbon steel under similar cyclic loading conditions.

  2. 2.

    The intensity of the decrease in the specific work for the origina oand propagationa p of a ductile crack after cyclic loading at normal temperature depends upon the amplitude of the stresses anda p decreases steadily over the whole investigated range of number of load cycles.

  3. 3.

    As the result of preliminary cyclic loading the resistance of the steel to brittle fracture decreases despite the presence in the material of individual zones of local plastic deformation causing the appearance in the brittle zones of the fractures of areas of a ductile constituent. This is related primarily to the occurrence in the basic volume of the material of strain aging.

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Literature cited

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    V. M. Goritskii, “Features of the structure of fatigue fractures and of failure of samples of iron at 77°K after preliminary cyclic loading at room temperature,” Probl. Prochn., No. 6, 38–47 (1977).

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    R. S. Grigor'ev, V. P. Larionov, G. A. Novikov, and P. G. Yakovlev, The Cold Resistance of Steels under Static and Cyclic Loads [in Russian], Nauka, Moscow (1969).

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    E. G. Yakovlev and V. N. Matkhanov, “The cold resistance of weld joints of VTsT3sp and 10KhSND steels operating under cyclic loads,” in: The Capacity of Machines and Structures under Low Temperature Conditions. The Cold Resistance of Materials [in Russian], Part I, Izd. Sib. Otd. Akad. Nauk SSSR, Yakutsk (1974), pp. 191–201.

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Additional information

Central Scientific-Research and Design Institute for Metal Structures. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 2, pp. 26–28, February, 1984.

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Belyaev, B.F., Goritskii, V.M. & Cherkasova, I.N. Influence of preliminary cyclic loading on the resistance to failure of 16G2AF low-alloy steel. Met Sci Heat Treat 26, 125–128 (1984).

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  • Cyclic Loading
  • Brittle Fracture
  • Maximum Degree
  • Load Cycle
  • Strain Aging