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Formation of Internal Stress Fields on a Rail Surface during Operation

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Abstract

The level of microscopic internal long-range stress fields σlr on the tread surface and working fillet has been determined for two rails with a carbon content of 0.74 and 0.91 wt % of categories DT350 (of general purpose) and DT400IK (with increased wear resistance and contact endurance) after a passed tonnage of 1770 million t (for DT350), and 187 million t (for DT400IK) (1) and 234 million t (for DT400IK) (2). For this purpose, the bending extinction contours are analyzed by means of transmission electron diffraction microscopy, the parameters of which are used in calculating σi. The presence of excess extinction contours indicates the bending–torsion of the lattice, which is characterized by an excess density of dislocations. A comparison is made with other methods for measuring internal stress fields at the meso and macro levels (optical and magnetic methods, X-ray diffraction analysis), which are integral. It is shown that the parameters of the bending extinction contours are the most informative and allow one to control locality of the σlr measurement. Sources of internal stress fields in rail steels are noted. An increase in the level of σlr in D400IK rails in comparison with rails of the DT350 category has been revealed. The growth in the passed tonnage for rails of the DT400IK category leads to an increase in σlr, while the values of internal stresses on the fillet surface exceed the corresponding values on the tread surface. The physical reasons for the observed changes are discussed.

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Funding

The work was carried out within the framework of state order no. FEMN-2023-0003.

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Authors and Affiliations

  1. Tomsk State University of Architecture and Building, 634003, Tomsk, Russia

    N. A. Popova & E. L. Nikonenko

  2. Siberian State Industrial University, 654007, Novokuznetsk, Russia

    V. E. Gromov, M. A. Porfiriev, R. E. Kryukov & A. N. Gostevskaya

  3. Institute of High Current Electronics, Siberian Branch, Russian Academy of Sciences, 634055, Tomsk, Russia

    Yu. F. Ivanov

  4. National Research Tomsk Polytechnic University, 634003, Tomsk, Russia

    E. L. Nikonenko

Authors
  1. N. A. Popova
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  2. V. E. Gromov
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  3. Yu. F. Ivanov
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  4. M. A. Porfiriev
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  5. E. L. Nikonenko
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  6. R. E. Kryukov
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  7. A. N. Gostevskaya
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Corresponding authors

Correspondence to N. A. Popova, V. E. Gromov, Yu. F. Ivanov, M. A. Porfiriev, E. L. Nikonenko, R. E. Kryukov or A. N. Gostevskaya.

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Translated by G. Dedkov

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Popova, N.A., Gromov, V.E., Ivanov, Y.F. et al. Formation of Internal Stress Fields on a Rail Surface during Operation. Tech. Phys. Lett. 49, 117–122 (2023). https://doi.org/10.1134/S1063785023700116

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  • DOI: https://doi.org/10.1134/S1063785023700116

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