Grinding induced martensite on the surface of rails

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Abstract

Rolling contact fatigue (RCF) is causing crack initiation and crack propagation in rails. Some types of RCF cracks are found to be associated with a white etching layer (WEL). A metallurgical investigation was carried out on a worn rail and the amounts of WEL at different positions on the rail were determined. Two different rail types R260 and R350HT that both had been ground by a grinding train were investigated. The rail sections, studied using optical and scanning electron microscopy, showed that the surface of both types of rails is covered with WELs. The hardness of the WEL is increased compared to the base material and the microstructural investigations reveal that a martensitic structure is present at the surface.
Original languageEnglish
JournalProceedings of the Risø International Symposium on Materials Science
Volume35
Pages (from-to)439-446
ISSN0907-0079
Publication statusPublished - 2014
Event35th Risø International Symposium on Materials Science : New Frontiers of Nanometals - DTU, Risø Campus, Roskilde, Denmark
Duration: 1 Sep 20145 Sep 2014
Conference number: 35

Conference

Conference35th Risø International Symposium on Materials Science : New Frontiers of Nanometals
Number35
LocationDTU, Risø Campus
CountryDenmark
CityRoskilde
Period01/09/201405/09/2014

Keywords

  • Shot peening
  • Compressive residual stress
  • Plastic deformation
  • Finite element method

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