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Residual stress in laser cladded rail

Research output: Contribution to journalArticle

Original languageEnglish
Article number105844
Number of pages10
JournalTribology International
Volume140
Early online date25 Jun 2019
DOIs
DateAccepted/In press - 19 Jun 2019
DateE-pub ahead of print - 25 Jun 2019
DatePublished (current) - 1 Dec 2019

Abstract

To improve the fatigue life of components subject to loads with high surface strain gradients, it is possible to coat them with an alloy of higher durability. The present study focuses on the effect of cladding high value track components, made of a standard rail steel UIC 900A/grade 260, with a layer of a premium martensitic stainless steel to reduce wear and fatigue. The laser cladding process inevitably generates residual stresses in the clad and parent metal, which could be detrimental to the integrity of the component. Therefore, measurements to determine the residual stress state of cladded rail were performed using semi-destructive centre-hole and deep hole drilling and non-destructive neutron diffraction techniques. Subsequently, the effects of cycling loading and wear, representative of typical service loads, on the redistribution of the residual stress field were investigated. It was observed that laser cladding causes a triaxial compressive residual stress field in the clad and near the interface and a tensile stress field in the parent material. The stress field is shown to change when the first cycle of load is applied but reaches a steady state after only 10 cycles: After the 10th cycle there is no evidence that the clad continues accumulating strain which could indicate that there is low risk of ratcheting. Wear effect on residual stress redistribution was found to be local on the surface of the specimen only.

    Research areas

  • Integrity, Residual stress, Laser clad, Rail

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Documents

  • Full-text PDF (accepted author manuscript)

    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Elsevier at https://www.sciencedirect.com/science/article/pii/S0301679X19303512. Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 1021 KB, PDF document

    Embargo ends: 25/06/20

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    Licence: CC BY-NC-ND

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