Evaluation of laser cladding as an in-situ repair method on rail steel

• DOI: 10.1016/j.triboint.2022.108210
• Publication Date: 2022-12-30T16:46:54Z
• Authors: K. Tomlinson; D.I. Fletcher; R. Lewis
• Keywords: Stellite; Cladding (metalworking)

Laser clad coatings have been considered as an in-situ repair method to extend the lifespan of rail. Building on previous research which predominantly focuses application such full sections rail this study considers repairs size comparable contact patch with additional consideration interface between parent and at surface. The small relative previously explored surface claddings necessitated a new investigation best performing materials combinations. To enable evaluation set experiments were designed assess multiple sites in single tests. Rolling-sliding twin-disc tests conducted using bespoke discs manufactured from standard R260 grade steel six wire eroded slots varying sizes filled three different candidate cladding materials, Stellite 6, MSS powder. evolution was monitored through visual observation every 5,000 cycles during tests, then sectioned integrity effect rolling loading. During material underwent plastic flow direction traction, experiencing alongside steel. success laser coating is shown be dependent selecting tends strain by similar amounts material, making it less vulnerable crack initiation points forming trailing edge where may otherwise over repair.