Rolling contact fatigue in relation to rail grinding

Research output: Contribution to journalArticleScientificpeer-review

42 Citations (Scopus)
119 Downloads (Pure)

Abstract

Spalling defects of a periodic nature are sometimes observed on heat-treated pearlitic steel rails. Defect properties suggest a relationship between maintenance grinding on a regular basis and the initiation of rolling contact fatigue (RCF). In this work, the effects of maintenance grinding are investigated experimentally for both standard and heat-treated pearlitic rails. Results show essentially different behaviour for both steels. On standard grades, friction-induced martensite (FIM) generated during grinding delaminates when in service. However, grinding induces severe top-layer deformation which coincides with that induced by train operation, thus yielding 'pre-fatigue' of the rail. On heat-treated grades, portions of FIM accumulated at groove edges during grinding are pressed into the deeper pearlitic matrix in combination with severe plastic deformation under tangential wheel-rail contact stresses. That process results in severe and extensive crack initiation. According to quantitative test results reported in the literature, this initial condition yields a reduction of the normal RCF life by roughly a factor nine, which is in accordance with both observations in the field and in the literature on rail spalling defects.

Original languageEnglish
Pages (from-to)110-121
Number of pages12
JournalWear
Volume356-357
DOIs
Publication statusPublished - 15 Jun 2016

Keywords

  • Rail grinding
  • Rail spalling
  • Residual stress
  • Rolling contact fatigue (RCF)
  • Squat
  • White etching layer (WEL)

Fingerprint Dive into the research topics of 'Rolling contact fatigue in relation to rail grinding'. Together they form a unique fingerprint.

Cite this