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Stages and Fracture Mechanisms of Lamellar Pearlite of 100-m-Long Differentially Hardened Rails Under Long-Term Operation Conditions

Yuriev, A. A.; Gromov, V. E.; Grishunin, V. A.; Ivanov, Yu. F.; Qin, R. S. and Semin, A. P. (2018). Stages and Fracture Mechanisms of Lamellar Pearlite of 100-m-Long Differentially Hardened Rails Under Long-Term Operation Conditions. Acta Metallurgica Sinica (English Letters), 31(12) pp. 1356–1360.

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DOI (Digital Object Identifier) Link: https://doi.org/10.1007/s40195-018-0810-9
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Abstract

Using the methods of transmission electron microscopy, the carbide phase evolution in surface layers of the differentially quenched rails is studied after the passed tonnage of 691.8 million tons at the depth up to 10 mm along the central axis and fillet of rail head. The action of two mutual supplement mechanisms of steel carbide phase transformation in surface layers at rail operation is established: (1) cutting mechanism of cementite particles with the following departure in the volume of ferrite grains or plates (in pearlite structure); (2) cutting mechanism and following dissolution of cementite particles, transfer of carbon atoms on dislocations (in Cottrell atmospheres and dislocation cores), transfer of carbon atoms by moving dislocations into ferrite grains volume (or plates) with the following repeated formation of nanosized cementite particles. The first mechanism is accompanied by the change in linear sizes and morphology of carbide particles. Cementite element composition change is not essential. Carbide structure change can take place during the second mechanism.

Item Type: Journal Item
Copyright Holders: 2018 The Chinese Society for Metals and Springer-Verlag GmbH Germany
ISSN: 2194-1289
Keywords: Cementite; Pearlite; fracture; rails; mechanisms; operation
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 57576
Depositing User: Rongshan Qin
Date Deposited: 12 Nov 2018 11:14
Last Modified: 03 May 2019 01:03
URI: http://oro.open.ac.uk/id/eprint/57576
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