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Multiscale characterization of head check initiation on rails under rolling contact fatigue Mechanical and microstructure analysis.pdf

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Multiscale characterization of head check initiation on rails under rolling contact fatigue Mechanical and microstructure analysis.pdf

Wear 366-367 (2016) 383–391 Contents lists available at ScienceDirect Wear journal homepage: /locate/wear Multiscale characterization of head check initiation on rails under rolling contact fatigue: Mechanical and microstructure analysis Dylewski Beno?t n, Bouvier Salima, Risbet Marion Sorbonne University, Université de technologie de Compiègne, CNRS, UMR 7337 Roberval, Centre de recherche Royallieu - CS 60 319 - 60 203 Compiègne cedex, France article info Article history: Received 5 October 2015 Received in revised form 17 June 2016 Accepted 18 June 2016 Available online 23 June 2016 Keywords: Rail Rolling contact fatigue Head check Microstructure Hardness abstract Head Check is a major rolling contact fatigue (RCF) defect initiated after cyclic wheel/rail contacts by severe plastic deformation of the rail head surface. A ?eld analysis campaign has been conducted on a site affected by Head Checking. The aim of this study is to increase understanding of the relationship between RCF cracking and plastic deformation of the pearlitic microstructure. Investigations are performed on samples taken at several stages of accumulated tonnage in the early stages of formation of the defect. To supplement previous characterizations of Head Checking and studies of damage mechanisms, several investigations have been carried out with a microstructural point of view. Following a multitechnical and multi-scale characterization of the worn rail surface, this experimental methodology has been based on the combination of several microstructural investigations by optical and scanning electron microscopy (FEG-SEM), microindentation performed on the gradient pro?le and determination of quantitative data on the pearlitic aggregates through the gradient by Electron Backscatter Diffraction (EBSD). Due to the severe plastic deformation near the gauge corner of the worn rail, the microstructure is progressively modi?ed. During the ?rst cycles of wheel/rail contacts, a strong evolution of the de