| Abstract: |
Cold gas dynamic spraying (CGDS), as a typical low-temperature thermal spraying technology, was used to prepare the coatings or components sensitive to temperature. Moreover, due to the high productivity and flexibility, cold gas dynamic spraying presents a great potential application in component reparation. The laser-based additive manufacturing (LBAM) processed samples always show an ultra-fine microstructure, which supplies high mechanical strength and wear/corrosion resistance, given to the high cooling rate of molten pool. From the economic and ecological aspects, CGDS is suitable to repair the LBAM processed component for maintaining the ultra-fine microstructure with significant low residual stress. In this study, CGDS was employed to prepare a dense coating on the surface of LBAM processed component with a AlSi10Mg composition. The interfacial microstructure was determined with a focus on bonding mechanism and cold worked affect zone by optical microscopy and scanning electron microscopy. The results show that not only the ultrafine microstructure could be remained, but also the porosity near surface region of the LBAM processed component was eliminated. Furthermore, the effects of post heat treatment on adhesive strength were determined and discussed by tensile test.
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