Formation of Gradient Structure–Phase States in the Surface Layers of 100-m Differentially Quenched Rails

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

Research output: Contribution to journalArticle

Abstract

Abstract—The evolution of the structural-phase states in the surface layers of the head of differentially quenched DT350 rails to a depth of 10 mm are studied by optical microscopy and transmission electron diffraction microscopy along the central axis after the passage of a tonnage of 691.8 mln t gross in the experimental ring of AO VNIIZhT (proof ground for railway transport). The formation of a gradient structure is revealed. In this structure, the scalar and excess dislocation densities, the lattice curvature–torsion amplitude, and the degree of deformation-induced transformation of lamellar pearlite change gradually. The mechanisms of fracture of cementite lamellae are considered.

Original languageEnglish
Pages (from-to)710-715
Number of pages6
JournalRussian Metallurgy (Metally)
Volume2019
Issue number7
DOIs
Publication statusPublished - 1 Jul 2019

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Keywords

  • Keywords: differentially quenched rails
  • long-term operation
  • phase composition
  • structure

ASJC Scopus subject areas

  • Metals and Alloys

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