Yu. F. Ivanov, M. A. Porfir’ev, V. E. Gromov, R. E. Kryukov, Yu. A. Shlyarova
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Structural-Phase States in the Head of Special-Purpose Rails after Long-Term Operation
Transmission electron microscopy methods are used to analyze the changes in the structure, phase composition, and dislocation substructure in the head of long differentially hardened special-purpose DT400IK rails made of E90KhAF steel along the radius of fillet rounding at the surface and at a distance of 2 and 10 mm from it after a passed tonnage of 187 mln t during field tests. Bend extinction contours, which indicate an elastic-stressed state of the rail head as a result of long-term operation, are found to form. The sources of lattice curvature torsion are revealed. The mechanisms of destruction of cementite lamellae and repeated precipitation of carbide-phase nanoparticles are considered.
期刊介绍：
Russian Metallurgy (Metally) publishes results of original experimental and theoretical research in the form of reviews and regular articles devoted to topical problems of metallurgy, physical metallurgy, and treatment of ferrous, nonferrous, rare, and other metals and alloys, intermetallic compounds, and metallic composite materials. The journal focuses on physicochemical properties of metallurgical materials (ores, slags, matters, and melts of metals and alloys); physicochemical processes (thermodynamics and kinetics of pyrometallurgical, hydrometallurgical, electrochemical, and other processes); theoretical metallurgy; metal forming; thermoplastic and thermochemical treatment; computation and experimental determination of phase diagrams and thermokinetic diagrams; mechanisms and kinetics of phase transitions in metallic materials; relations between the chemical composition, phase and structural states of materials and their physicochemical and service properties; interaction between metallic materials and external media; and effects of radiation on these materials.
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