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Structure and Mechanical Properties of the Heat-Affected Zone of Restored Railway Wheels

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By using the results of investigation of the influence of heat treatment of 65G steel simulating the thermal-and-deformation cycle of reconstruction welding of railway wheels, it is shown that the resistance to brittle fracture of the wheel metal in its heat-affected zone can be increased to the level of the base metal by the formation of a bainite-martensite structure in this zone and holding for 2–3 h at 100°C in the course of its cooling after welding. As a result of this holding, the plasticity of the metal, its impact toughness, the fatigue threshold of cracked specimens, and cyclic fracture toughness become, respectively, 1.8, 2–3, 1.6, and 1.8 times higher and the strength remains almost constant. This is explained by the fact that the stresses of the second kind and local strains in the bulk of bainite and martensite strips become ~1.5 times lower.

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Authors and Affiliations

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

    О. А. Haivorons’kyi, V. D. Poznyakov, L. І. Markashova, Т. О. Alekseenko & О. S. Shyshkevych

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

    О. P. Ostash & V. V. Kulyk

Authors
  1. О. А. Haivorons’kyi
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  2. V. D. Poznyakov
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  3. L. І. Markashova
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  4. О. P. Ostash
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  5. V. V. Kulyk
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  6. Т. О. Alekseenko
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  7. О. S. Shyshkevych
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Correspondence to V. V. Kulyk.

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Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 51, No. 4, pp. 114–119, July–August, 2015.

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Haivorons’kyi, О.А., Poznyakov, V.D., Markashova, L.І. et al. Structure and Mechanical Properties of the Heat-Affected Zone of Restored Railway Wheels. Mater Sci 51, 563–569 (2016). https://doi.org/10.1007/s11003-016-9876-6

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  • DOI: https://doi.org/10.1007/s11003-016-9876-6

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