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| Ertürk, Emre |
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Lewis, Roger
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Publications (7/7 displayed)
- 2023Characterisation and tribological testing of recycled crushed glass as an alternative rail sandcitations
- 2022Iron oxide and water paste rheology and its effect on low adhesion in the wheel/rail interfacecitations
- 2021Two-layer laser clad coating as a replacement for chrome electroplating on forged steelcitations
- 2019Residual stress in laser cladded railcitations
- 2015High pressure torsion testing of the wheel/rail interface
- 2011Fiber metamaterials with negative magnetic permeability in the terahertzcitations
- 2010Mapping Railway Wheel Material Wear Mechanisms and Transitionscitations
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article
Residual stress in laser cladded rail
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.