Rail Strengthening Nature in the Course of Long-Term Operation

Using the methods of transmission electron diffraction microscopy and measurement of microhardness, the regularities of the change in the structural-phase states and defective substructure of the surface layers of rails up to 10 mm by fillet after long-term operation (the passed tonnage of 1000 mill...

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Bibliographic Details
Published in:Inorganic materials : applied research 2018, Vol.9 (1), p.26-31
Main Authors: Gromov, V. E., Peregudov, O. A., Glezer, A. M., Morozov, K. V., Ivanov, Yu. F., Yur’ev, A. B.
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Dislocations
Dispersion strengthening
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Materials Science
Microhardness
Phase transitions
Quantitative analysis
Rails
Residual stress
Tonnage
Transmission electron diffraction
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Summary:Using the methods of transmission electron diffraction microscopy and measurement of microhardness, the regularities of the change in the structural-phase states and defective substructure of the surface layers of rails up to 10 mm by fillet after long-term operation (the passed tonnage of 1000 million tons gross) are established. The possible causes of the observed regularities are discussed. A quantitative analysis of the mechanisms of strengthening of rails at different distance from the rolling surface by fillet after long-term operation is carried out. It is shown that strengthening is multifactorial in nature and is due to substructural strengthening caused by the formation of nanoscale fragments; dispersion strengthening by carbide phase particles; strengthening caused by the formation of Cottrell and Suzuki atmospheres on dislocations; internal stress fields, formed inside; and interphase boundaries.
ISSN:2075-1133
2075-115X
DOI:10.1134/S2075113318010148