Surface crack formation on rails at grinding induced martensite white etching layers

Carsten Jørn Rasmussen, Søren Fæster, Somrita Dhar, Jesper Viggo Quaade, Manuel Bini, Hilmar Kjartansson Danielsen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The connection between profile grinding of rails, martensite surface layers and crack initiation has been investigated using visual inspection, optical microscopy and 3D X-ray computerized tomography. Newly grinded rails were extracted and found to be covered by a continuous surface layer of martensite with varying thickness formed by the grinding process. Worn R350HT and R200 rails were extracted from the Danish rail network as they had transverse bands resembling grinding marks on the running surface. The transverse bands were shown to consist of martensite which had extensive crack formation at the martensite/pearlite interface. The cracks in R350HT propagated down into the rail while those in the soft R200 returned to the surface causing only very small shallow spallation. The transverse bands had the same shape, size, orientation, location and periodicity which would be expected from grinding marks, showing a clear connection between grinding and crack initiation.
Original languageEnglish
JournalWear
Volume384-385
Pages (from-to)8-14
Number of pages7
ISSN0043-1648
DOIs
Publication statusPublished - 2017

Keywords

  • Grinding
  • Railway
  • Steel
  • Martensite

Cite this

Rasmussen, Carsten Jørn ; Fæster, Søren ; Dhar, Somrita ; Quaade, Jesper Viggo ; Bini, Manuel ; Danielsen, Hilmar Kjartansson. / Surface crack formation on rails at grinding induced martensite white etching layers. In: Wear. 2017 ; Vol. 384-385. pp. 8-14.
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abstract = "The connection between profile grinding of rails, martensite surface layers and crack initiation has been investigated using visual inspection, optical microscopy and 3D X-ray computerized tomography. Newly grinded rails were extracted and found to be covered by a continuous surface layer of martensite with varying thickness formed by the grinding process. Worn R350HT and R200 rails were extracted from the Danish rail network as they had transverse bands resembling grinding marks on the running surface. The transverse bands were shown to consist of martensite which had extensive crack formation at the martensite/pearlite interface. The cracks in R350HT propagated down into the rail while those in the soft R200 returned to the surface causing only very small shallow spallation. The transverse bands had the same shape, size, orientation, location and periodicity which would be expected from grinding marks, showing a clear connection between grinding and crack initiation.",
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language = "English",
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Surface crack formation on rails at grinding induced martensite white etching layers. / Rasmussen, Carsten Jørn; Fæster, Søren; Dhar, Somrita; Quaade, Jesper Viggo; Bini, Manuel; Danielsen, Hilmar Kjartansson.

In: Wear, Vol. 384-385, 2017, p. 8-14.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Surface crack formation on rails at grinding induced martensite white etching layers

AU - Rasmussen, Carsten Jørn

AU - Fæster, Søren

AU - Dhar, Somrita

AU - Quaade, Jesper Viggo

AU - Bini, Manuel

AU - Danielsen, Hilmar Kjartansson

PY - 2017

Y1 - 2017

N2 - The connection between profile grinding of rails, martensite surface layers and crack initiation has been investigated using visual inspection, optical microscopy and 3D X-ray computerized tomography. Newly grinded rails were extracted and found to be covered by a continuous surface layer of martensite with varying thickness formed by the grinding process. Worn R350HT and R200 rails were extracted from the Danish rail network as they had transverse bands resembling grinding marks on the running surface. The transverse bands were shown to consist of martensite which had extensive crack formation at the martensite/pearlite interface. The cracks in R350HT propagated down into the rail while those in the soft R200 returned to the surface causing only very small shallow spallation. The transverse bands had the same shape, size, orientation, location and periodicity which would be expected from grinding marks, showing a clear connection between grinding and crack initiation.

AB - The connection between profile grinding of rails, martensite surface layers and crack initiation has been investigated using visual inspection, optical microscopy and 3D X-ray computerized tomography. Newly grinded rails were extracted and found to be covered by a continuous surface layer of martensite with varying thickness formed by the grinding process. Worn R350HT and R200 rails were extracted from the Danish rail network as they had transverse bands resembling grinding marks on the running surface. The transverse bands were shown to consist of martensite which had extensive crack formation at the martensite/pearlite interface. The cracks in R350HT propagated down into the rail while those in the soft R200 returned to the surface causing only very small shallow spallation. The transverse bands had the same shape, size, orientation, location and periodicity which would be expected from grinding marks, showing a clear connection between grinding and crack initiation.

KW - Grinding

KW - Railway

KW - Steel

KW - Martensite

U2 - 10.1016/j.wear.2017.04.014

DO - 10.1016/j.wear.2017.04.014

M3 - Journal article

VL - 384-385

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