Materials Science

, Volume 54, Issue 6, pp 776–782 | Cite as

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

  • О. P. OstashEmail author
  • V. V. Kulyk
  • V. D. Poznyakov
  • О. А. Gaivorons’kyi
  • V. V. Vira

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.


high-strength steel bainite–martensite structure deformation martensite transformation internal stresses of the second kind strength cyclic crack-growth resistance 


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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • О. P. Ostash
    • 1
    Email author
  • V. V. Kulyk
    • 2
  • V. D. Poznyakov
    • 3
  • О. А. Gaivorons’kyi
    • 3
  • V. V. Vira
    • 2
  1. 1.Karpenko Physicomechanical InstituteUkrainian National Academy of SciencesLvivUkraine
  2. 2.“L’vivs’ka Politekhnika” National UniversityLvivUkraine
  3. 3.Paton Institute of Electric WeldingUkrainian National Academy of SciencesKyivUkraine

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