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

A. A. Yuriev, V. E. Gromov, V. A. Grishunin, Yu F. Ivanov, R. S. Qin, A. P. Semin

Research output: Contribution to journalArticle

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.

Original languageEnglish
Pages (from-to)1356-1360
Number of pages5
JournalActa Metallurgica Sinica (English Letters)
Volume31
Issue number12
DOIs
Publication statusPublished - 1 Dec 2018

Fingerprint

Pearlite
Carbides
Rails
Ferrite
Carbon
Atoms
Steel
Dissolution
Phase transitions
Transmission electron microscopy
Chemical analysis

Keywords

  • Cementite
  • Fracture
  • Mechanisms
  • Operation
  • Pearlite
  • Rails

ASJC Scopus subject areas

  • Metals and Alloys
  • Industrial and Manufacturing Engineering

Cite this

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.; Semin, A. P.

In: Acta Metallurgica Sinica (English Letters), Vol. 31, No. 12, 01.12.2018, p. 1356-1360.

Research output: Contribution to journalArticle

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