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Microstructural characterisation of railhead damage in insulated rail joints

Journal Article


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Abstract


  • As an integral part the railway network infrastructure, insulated rail joints (IRJs) electrically isolate

    track segments providing critical feedback to both track signaling and train position detection

    systems. Because of the discontinuous nature of IRJs, accumulated damage at the railhead is high.

    Failure modes include plastic flow of metal across joints, bolt and fishplate failures, delamination of

    insulated material and, as a result of rolling contact fatigue, end post and endpost surface damage.

    In the current investigation, microstructural changes in the vicinity of endposts of IRJs made from

    both surface coated and uncoated rail are investigated using techniques of optical and scanning

    electron microscopy. Damaged IRJs made from pearlitic head hardened rail steel are compared with

    head hardened rail steel laser coated with martensitic stainless steel, the latter having an increased

    service life. Problems associated with the surface coating are identified and approaches to further

    improving IRJ resistance to rolling contact fatigue suggested.

Publication Date


  • 2012

Citation


  • Rathod, C., Wexler, D., Chandra, T. & Li, H. (2012). Microstructural characterisation of railhead damage in insulated rail joints. Materials Science Forum, 706-709 2937-2942.

Scopus Eid


  • 2-s2.0-84862965129

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=8253&context=engpapers

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/5321

Has Global Citation Frequency


Number Of Pages


  • 5

Start Page


  • 2937

End Page


  • 2942

Volume


  • 706-709

Place Of Publication


  • Switzerland

Abstract


  • As an integral part the railway network infrastructure, insulated rail joints (IRJs) electrically isolate

    track segments providing critical feedback to both track signaling and train position detection

    systems. Because of the discontinuous nature of IRJs, accumulated damage at the railhead is high.

    Failure modes include plastic flow of metal across joints, bolt and fishplate failures, delamination of

    insulated material and, as a result of rolling contact fatigue, end post and endpost surface damage.

    In the current investigation, microstructural changes in the vicinity of endposts of IRJs made from

    both surface coated and uncoated rail are investigated using techniques of optical and scanning

    electron microscopy. Damaged IRJs made from pearlitic head hardened rail steel are compared with

    head hardened rail steel laser coated with martensitic stainless steel, the latter having an increased

    service life. Problems associated with the surface coating are identified and approaches to further

    improving IRJ resistance to rolling contact fatigue suggested.

Publication Date


  • 2012

Citation


  • Rathod, C., Wexler, D., Chandra, T. & Li, H. (2012). Microstructural characterisation of railhead damage in insulated rail joints. Materials Science Forum, 706-709 2937-2942.

Scopus Eid


  • 2-s2.0-84862965129

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=8253&context=engpapers

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/5321

Has Global Citation Frequency


Number Of Pages


  • 5

Start Page


  • 2937

End Page


  • 2942

Volume


  • 706-709

Place Of Publication


  • Switzerland