Microstructure of Thin Wall Formed by Multi-Layer Laser Cladding

Thin wall was formed by multi-layer laser cladding. The results showed that the microstructure of the thin wall presented obviously and continuously grown dendrite and no white layer appeared between individual multi-layers. The orientated column dendrites were observed in the first layer, which was unhelpful to interfacial bonding. This is related to the effects of the substrate on the composition and cooling rate of the first layer. The interlayer bonding between other multi-layers was epitaxial growth with mutual occlusion and was helpful to the improvement of bonding intensity.