Evolution of the structure and phase states of rails in prolonged operation

Yu F. Ivanov, V. E. Gromov, O. A. Peregudov, K. V. Morozov, A. B. Yur’ev

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The transformation of the structural and phase states and defect substructure of the surface layer (depth up to 10 mm) in rails during prolonged operation (with a total load amounting to 1000 million t) is analyzed on the basis of metal physics. The microhardness is plotted, and decrease in strength of the rail’s contact surface after prolonged operation is noted. In rail operation, a multilayer structure is formed. The surface layer (about 20 μm) has a multiphase submicrocrystalline and nanocrystalline structure; it contains micropores and microcracks. The structure at a distance of 2 mm from the contact surface is morphologically similar to the steel structure before operation: it consists primarily of pearlite grains (mainly plates), mixed ferrite-carbide grains, and structure-free ferrite grains. The density of the flexural extinction contours increases at a distance of 2 mm from the contact surface. The amplitude of the stress field is greatest at the phase boundary between a globular particle and the matrix.

Original languageEnglish
Pages (from-to)254-257
Number of pages4
JournalSteel in Translation
Volume45
Issue number4
DOIs
Publication statusPublished - 27 Apr 2015

Keywords

  • contact surface
  • fracture
  • microhardness
  • operation
  • phase composition
  • rails
  • stress field
  • structure

ASJC Scopus subject areas

  • Materials Science(all)

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