Formation and Evolution of Structure-Phase States in Rails after Drawn Resource

V. E. Gromov; K. V. Morozov; Yu. F. Ivanov; K. V. Aksenova; O. A. Peregudov; A. P. Semin

doi:10.17804/2410-9908.2016.1.038-044

V. E. Gromov, K. V. Morozov, Yu. F. Ivanov, K. V. Aksenova, O. A. Peregudov, A. P. Semin

FORMATION AND EVOLUTION OF STRUCTURE-PHASE STATES IN RAILS AFTER DRAWN RESOURCE

DOI: 10.17804/2410-9908.2016.1.038-044

By optic and transmission electron microscopy, the regularities of the transformation of structural-phase states, the defective substructure of the rail surface layer to the depth of 10 mm under long-term operation (passed gross tonnage 500 and 1000 mln ton) are determined. In the initial state the structure is presented by perlite grains with predominantly lamellar morphology, grains of a ferrite-carbide mixture and structurally free ferrite grains. It is shown that operation of rail steel is accompanied by a complete failure of lamellar pearlite grains in the 15 μm thick surface layer and the formation of a ferrite-carbide mixture with nano-size particles. The strain-induced transformation of steel leads to the increase in the scalar and excessive density of dislocations, the curvature-torsion value of the crystal lattice and the amplitude of internal stress fields.

Keywords: structure, phase composition, surface, rails, operation, dislocation density

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$Fig. 2. Electron microscope image of the structure being formed in the rail surface layer after gross 500 mln ton; a, c, d – light fields; b – dark field obtained in the reflections [110]α-Fe+[102]Fe3C; in a, b, c – microelectron diffraction patterns. T$ $Fig. 3. Electron microscope image of the structure of the rail steel layer on the contact surface: (a, c) – bright field; (b, d) – dark field obtained in the reflections [031] Fe3C and [211] Fe3C; electron microdiffraction patterns; the arrows indicate$

Библиографическая ссылка на статью

Formation and Evolution of Structure-Phase States in Rails after Drawn Resource / V. E. Gromov, K. V. Morozov, Yu. F. Ivanov, K. V. Aksenova, O. A. Peregudov, A. P. Semin // Diagnostics, Resource and Mechanics of materials and structures. - 2016. - Iss. 1. - P. 38-44. -
DOI: 10.17804/2410-9908.2016.1.038-044. -
URL: http://dream-journal.org/issues/2016-1/2016-1_67.html
(accessed: 31.10.2024).