Nanotechnologies in Russia

, Volume 9, Issue 5–6, pp 288–292 | Cite as

Formation of gradients of structure, phase composition, and dislocation substructure in differentially hardened rails

  • V. E. Gromov
  • K. V. Morozov
  • Yu. F. Ivanov
  • K. V. Volkov
  • S. V. Konovalov
Article

Abstract

A layer by layer analysis of rails, differentially hardened in various modes, has been carried out using transmission electron microscopy on various scale levels. It has been shown that the differential hardening of rails is accompanied by the formation of a morphologically different structure, which is formed according to the diffusion mechanism of γ-α transformation and consisting of plate perlite grains, free ferrite grains, and grains of a ferrite-carbide mixture. The gradient character of modifications of structure, phase composition, and dislocation substructure parameters along the cross section of rail head has been established. It has been revealed that the interfaces between globular cementite particles and the matrix are the most dangerous stress concentrators.

Keywords

Carbide Phase Rail Steel Interplate Distance Differential Hardening Globular Particle 

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Copyright information

© Pleiades Publishing, Ltd. 2014

Authors and Affiliations

  • V. E. Gromov
    • 1
  • K. V. Morozov
    • 2
  • Yu. F. Ivanov
    • 3
    • 4
  • K. V. Volkov
    • 2
  • S. V. Konovalov
    • 1
  1. 1.Siberian State Industrial UniversityNovokuznetskRussia
  2. 2.EVRAZ Consolidated West Siberian Metallurgical PlantNovokuznetskRussia
  3. 3.National Research Tomsk Polytechnic UniversityTomskRussia
  4. 4.Institute of High Current Electronics, Siberian BranchRussian Academy of SciencesTomskRussia

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