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.
Highlights
(Phys.-math.), Professor, Chief Research associate Gromov V.E.3, Dr Sci
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
Summary
(Phys.-math.), Professor, Chief Research associate Gromov V.E.3, Dr Sci. (Phys.-math.), Professor, Head of the Chair of Physics named after V.M. Finkel’ (gromov@physics.sibsiu.ru ) Peregudov O.A.1, Engineer Morozov K.V.4, Engineer Yur’ev A.B.4, Dr Sci.
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