Laser cladding is a new technique that results in a surface layer of intermediate thickness intimately bonded to a substrate. This paper reports studies of the mechanical properties of a Co -Cr laser cladded steel substrate.Mechanical tests include hardness pro les, and tensile and low cycle fatigue. Results show that the interface between substrate and clad is very strong. Composites consisting of the clad, heat affected zone, and substrate exhibit good strain hardening and ductility. In low cycle fatigue, the number of cycles to failure for the composite is somewhat lower than for the substrate material alone for all strain amplitudes. However, the situation is reversed for stress versus number of cycles to failure. Residual stresses created during cladding survive throughout the lifetime in low cycle fatigue tests for small strain amplitudes, but vanish for higher strain amplitudes.MST/5788
A model on laser cladding of medium carbon steel, used in railway wheels and rails, is developed and implemented. When the laser beam is scanned over the surface during the cladding operation, phase transformations occur in the topmost layer of the substrate material due to rapid heating and cooling. The hardened regions may later be annealed, either during subsequent passes of the laser beam or by for example induction heating. The current model is a first step towards judging the resulting microstructure and hardness in the heat affected zone under the clad.
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