Physical Nature of Structure and Properties Degradation of Rail Surface after Long Term Operation

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By methods of optical, scanning and transmission electron diffraction microscopy and microhardness and tribology parameters measurement the changes regularities of structure-phase states, defect substructure of rails surface after the long term operation (passed tonnage of gross weight 500 and 1000 mln. tons) were established. It is shown that the wear rate increases in 3 and 3.4 times after passed tonnage of gross weight 500 and 1000 mln. tons, accordingly, and the friction coefficient decreases in 1.4 and 1.1 times. The cementite plates are destroying absolutely and cementite particles of around form with the sizes 10-50 nm are forming after passed tonnage 500 mln tons. The appearance of dynamical recrystallization initial stages is marked after the passed tonnage 1000 mln tons. It is shown that the operation of steel rails is accompanied by full fractures in surface layers with lamellar pearlite grains and the formation of ferrite–carbide mixtures with nanosized particles. The deformation of steel increases the densities of scalar and excess dislocations, the curvature–torsion values of the crystal lattice, and the amplitudes of internal stress fields. The possible mechanisms of established regularities are discussed. It is noted that two competitive processes can take place during rails long term operation: 1. Process of cutting of cementite particles followed by their carrying out into the volume of ferrite grains or plates (in the structure of pearlite). 2. Process of cutting, the subsequent dissolution of cementite particles, transition of carbon atoms to dislocations (into Cottrell atmospheres), transition of carbon atoms by dislocations into volume of ferrite grains or plates followed by repeat formation of nanosize cementite particles.

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Edited by:

Mikhail D. Starostenkov, Aleksandr I. Potekaev, Sergey V. Dmitriev and Prof. P. Ya. Tabakov

Pages:

39-45

Citation:

V. E. Gromov et al., "Physical Nature of Structure and Properties Degradation of Rail Surface after Long Term Operation", Journal of Metastable and Nanocrystalline Materials, Vol. 30, pp. 39-45, 2018

Online since:

January 2018

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$41.00

* - Corresponding Author

[1] E.A. Shur, Rail Damage, Intekst, Moscow, (2012).

[2] V.E. Gromov, A.B. Yur'ev, K.V. Morozov, Yu.F. Ivanov, Microstructure of Hardened Rails, Inter-Kuzbass, Novokuznetsk, (2014).

[3] Yu. Ivanisenko, H.J. Fecht, Microstructure modification in the surface layers of railway rails and wheels: effect of high strain rate deformation, Steel tech. 3 (2008) 19-23.

[4] Yu. Ivanisenko, I. MacLaren, X. Sauvage, R. Z Valiev., H. -J. Fecht, Shear-induced α→γ transformation in nanoscale Fe-C composite, Acta Mater. 54 (2006) 1659-1669.

DOI: https://doi.org/10.1016/j.actamat.2005.11.034

[5] Jiang-li Ning, E. Courtois-Manara, L. Kurmanaeva, A.V. Ganeev, R.Z. Valiev, C. Kübel, Yu. Ivanisenko, Tensile properties and work hardening behaviors of ultrafine grained carbon steel and pure iron processed by warm high pressure torsion, Materials Science and Engineering: A, 581 (2013).

DOI: https://doi.org/10.1016/j.msea.2013.05.008

[6] V.G. Gavriljuk, Decomposition of cementite in pearlitic steel due to plastic deformation, Materials Science and Engineering: A, 345 (2003) 81-89.

DOI: https://doi.org/10.1016/s0921-5093(02)00358-1

[7] Y.J. Li, P. Chai, C. Bochers, S. Westerkamp, S. Goto, D. Raabe, R. Kirchheim, Atomic-scale mechanisms of deformation-induced cementite decomposition in pearlite, Acta Mater. 59 (2011) 3965–3977.

DOI: https://doi.org/10.1016/j.actamat.2011.03.022

[8] V.G. Gavriljuk, Comment on Effect of interlamellar spacing on cementite dissolution during wire drawing of pearlitic steel wires, Scripta Materialia, 45 (2001) 1469-1472.

DOI: https://doi.org/10.1016/s1359-6462(01)01185-x

[9] A.M. Glezer, The nature of ultrahigh plastic (megaplastic) deformation, Bull. Russ. Acad. Sci.: Phys. 71 (2007) 1722.

DOI: https://doi.org/10.3103/s106287380712012x

[10] V.E. Gromov, E.V. Kozlov, V.I. Bazaikin et al., Physics and mechanics of drawing and forging, Nedra, Moscow, (1997).

[11] G. Thomas and M.J. Goringe, Transmission electron microscopy of materials, Wiley, New York, (1979).

[12] P.B. Hirsch, A. Howie, R.B. Nicholson, D.W. Pashley, and M.J. Whelan, Electron microscopy of thin crystals, Butterworth, Washington, (1965).

[13] L.M. Utevskii, Diffraction electron microscopy in metallography, Metallurgiya, Moscow, (1973).

[14] Yu.F. Ivanov, V.E. Gromov, O.A. Peregudov, K.V. Morozov, A.B. Yur'ev, Evolution of the structure and phase states of rails in prolonged operation, Steel in translation, 45 (2015) 254-257.

DOI: https://doi.org/10.3103/s0967091215040075

[15] O.A. Peregudov, V.E. Gromov, Yu.F. Ivanov, K.V. Morozov, K.V. Alsaraeva, O.A. Semina, Structure-phase states evolution in rails during a long operation, AIP conference proceedings, 1683 (2015) 020179.

DOI: https://doi.org/10.1063/1.4932869

[16] Yu.F. Ivanov, O.A. Peregudov, K.V. Morozov, V.E. Gromov, N.A. Popova, E.N. Nikonenko, Formation structural phase gradients in rail steel during long-term operation, IOP Conference Series: Materials Science and Engineering, 112 (2016) 012038.

DOI: https://doi.org/10.1088/1757-899x/112/1/012038

[17] V.E. Gromov, O.A. Peregudov, Y.F. Ivanov, A.M. Glezer, K.V. Morozov, K.V. Aksenova, O.A. Semina, Physical nature of rail strengthening in long term operation, AIP Conference Proceedings, 1783 (2016) 020069.

DOI: https://doi.org/10.1063/1.4966362

[18] Yu.F. Ivanov, O.A. Peregudov, K.V. Morozov, V.E. Gromov, N.A. Popova, E.N. Nikonenko, Formation structural phase gradients in rail steel during long-term operation, IOP Conference Series: Materials Science and Engineering, 112 (2016). 012038.

DOI: https://doi.org/10.1088/1757-899x/112/1/012038

[19] O.A. Peregudov, V.E. Gromov, Y.F. Ivanov, K.V. Morozov, S.V. Konovalov, Structural and phase states in high-quality rail, Steel in translation, 46 (2016) 260-263.

DOI: https://doi.org/10.3103/s0967091216040100

[20] O.A. Peregudov, K.V. Morozov, V.E. Gromov, A.M. Glezer, Yu.F. Ivanov, Formation of internal stress fields in rails during long-term operation, Russian metallurgy, 2016 (2016) 371-374.

DOI: https://doi.org/10.1134/s0036029516040182

[21] V.E. Gromov, Y.F. Ivanov, K.V. Morozov, O.A. Peregudov, O.A. Semina, Long-term operation of rail steel: degradation of structure and properties of surface layer, Journal of surface investigation. X-ray, Synchrotron and Neytron techniques, 10 (2016).

DOI: https://doi.org/10.1134/s1027451016050281