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Influence of the Modes of Heat Treatment on the Strength and Cyclic Crack-Growth Resistance of 65G Steel

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Materials Science Aims and scope

To find the ways of increasing the brittle-fracture resistance of the metal in the heat-affected zone formed as a result of repair surfacing of the rolling surface of railroad wheels, we study the influence of various modes of heat treatment, including the traditional and modified (by the authors) Q-n-Ptreatments on the mechanical properties of 65G steel regarded as a model wheel steel. It is shown that, after the modified Q-n-P-treatment, the mechanical characteristics of steel increase to a greater extent than after the traditional treatment. However, according to the parameter of structural strength P = [ΔU · ΔKth · ΔKfc ], where ΔU is the ultimate strength, ΔKth is the fatigue threshold, and ΔKfc is the cyclic fracture toughness of the material, the mode of treatment proposed earlier, which leads to the relaxation of stresses of the second kind in the bulk of martensite and bainite lathes, proves to be more efficient.

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Authors and Affiliations

  1. Karpenko Physicomechanical Institute, Ukrainian National Academy of Sciences, Lviv, Ukraine

    О. P. Ostash

  2. “L’vivs’ka Politekhnika” National University, Lviv, Ukraine

    V. V. Kulyk & V. V. Vira

  3. Paton Institute of Electric Welding, Ukrainian National Academy of Sciences, Kyiv, Ukraine

    V. D. Poznyakov & О. А. Gaivorons’kyi

Authors
  1. О. P. Ostash
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  2. V. V. Kulyk
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  3. V. D. Poznyakov
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  4. О. А. Gaivorons’kyi
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  5. V. V. Vira
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Correspondence to О. P. Ostash.

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Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 54, No. 6, pp. 24–29, November–December, 2018.

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Ostash, О.P., Kulyk, V.V., Poznyakov, V.D. et al. Influence of the Modes of Heat Treatment on the Strength and Cyclic Crack-Growth Resistance of 65G Steel. Mater Sci 54, 776–782 (2019). https://doi.org/10.1007/s11003-019-00263-6

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  • DOI: https://doi.org/10.1007/s11003-019-00263-6

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