Fracture Physics and Phase Transformation of Cementite in Rails under Extreme Operation Conditions
УДК 538.9:669.539.382:669.17:625.1
Abstract
This paper presents the quantitative estimation of carbon atom distribution in cementite particles and elements of defective substructures within the 10 mm depth area of the running surface of rails along the central axis and the symmetry axis of the upper fillet. The estimation is based on the electron microscopic study and X-ray spectral analysis. The subjects of the study are the differentially hardened 100-meter long rails after passing tonnage of 1411 and 1770 million tons of gross weight. There are three mechanisms of cementite plates transformation analyzed in the paper. It is shown that extremely long operation of rails is accompanied by a significant redistribution of carbon atoms in surface layers with depths up to 10 mm.
In the initial state, the basic amount of carbon atoms is concentrated in cementite particles. After the extremely long operation period, there are defects in the crystalline structure (dislocations, grain and subgrain boundaries) with the presence of the а-iron in the surface layer and the crystal lattice. An increase of passing tonnage from 1411 to 1770 million tons leads to a distinctive shift of carbon atoms to structural defects of the rail upper fillet. The discussion of the obtained results includes the concepts of bifurcation interstitial structure states in the crystalline structure rotation zones and plastic distortion, along with the analogies of extremely long operation and megaplastic deformations.
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Copyright (c) 2024 Михаил Анатольевич Порфирьев, Наталья Анатольевна Попова, Виктор Евгеньевич Громов, Юлия Андреевна Шлярова, Олег Александрович Перегудов, Юрий Федорович Иванов
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