Rail Strengthening Nature in the Course of Long-Term Operation

• Published in: Inorganic materials : applied research Vol. 9; no. 1; pp. 26 - 31
• Main Authors: Gromov, V. E., Peregudov, O. A., Glezer, A. M., Morozov, K. V., Ivanov, Yu. F., Yur’ev, A. B.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 2018; Springer Nature B.V
• 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; strengthening mechanisms; surface; rails; phase composition; operation; structure; defective substructure
• ISSN: 2075-1133; 2075-115X
• DOI: 10.1134/S2075113318010148

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.