EVOLUTION OF RAIL STRUCTURE-PHASE STATES AT CONTINUOUS SERVICE
https://doi.org/10.17073/0368-0797-2015-4-262-266
Abstract
The regularities of structure-phase states and defect substructure
transformations of the rail surface layer with the 10 mm depth under continuous service (the passed tonnage of 1000 million ton of gross weight) have been revealed by the methods of modern physical material science. The microhardness profi les have been constructed and the reduction of the strength characteristics of the rolling surface after the rail operation on the railr ad has been revealed. Operation of the rails leads to the formation of the multilayer structure. It has been shown that the surface layer with the ~20 μm depth has a multiphase submicro- and nanocrystal structure and contains micropores and microcracks. The layer structure located at a distance of 2 mm from the rolling surface is morphologically similar to that of the steel before the operation and it is presented predominantly by perlite grains of lamellar morphology, grains of ferrite-carbide mixture and structurally
free ferrite grains. The increased density of bend extinction contours at the depth of 2 mm from the rolling surface have been noted and it has been shown that maximum amplitude of stress fi elds is formed at the interphase globular particle-matrix density.
Keywords
rails,
operation,
fracture,
structure,
phase composition,
microhardness,
stress fi elds,
rolling surface
About the Authors
Yu. F. Ivanov
National Research Tomsk Polytechnic University 30, Lenina ave., Tomsk, 634036, Russia
Institute of High Current Electronics SB RAS 2/3, Akademicheskii ave., Tomsk, 634055, Russia
Russian Federation
Russian Federation
Dr. Sci. (Phys.-math.), Professor, Chief Research associate
V. E. Gromov
Siberian State Industrial University 42, Kirova str. Kemerovo region, Novokuznetsk, 654007, Russia
Russian Federation
Russian Federation
Dr. Sci. (Phys.-math.), Professor, Head of the Chair of Physics named after V.M. Finkel
O. A. Peregudov
National Research Tomsk Polytechnic University 30, Lenina ave., Tomsk, 634036, Russia
Russian Federation
Engineer
Russian Federation
Engineer
K. V. Morozov
JSC “EVRAZ – Joint West Siberian Metallurgical Plant” 16, Kosmicheskoe route, Kemerovo region, Novokuznetsk, 654043, Russia
Russian Federation
Engineer
Russian Federation
Engineer
A. B. Yur’ev
JSC “EVRAZ – Joint West Siberian Metallurgical Plant” 16, Kosmicheskoe route, Kemerovo region, Novokuznetsk, 654043, Russia
Russian Federation
Russian Federation
Dr. Sci. (Tech.), Managing Director, Professor of the Chair of Physics named after V.M. Finkel’
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Review
For citations:
Ivanov Yu.F., Gromov V.E., Peregudov O.A., Morozov K.V., Yur’ev A.B. EVOLUTION OF RAIL STRUCTURE-PHASE STATES AT CONTINUOUS SERVICE. Izvestiya. Ferrous Metallurgy. 2015;58(4):262-266. (In Russ.) https://doi.org/10.17073/0368-0797-2015-4-262-266
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