The residual stress is known as an important determinant of cold-sprayed coating property. Cold-sprayed coatings involve compressive residual stress generated by severe plastic deformation of the particles. The compressive residual stress has good effects such as improving corrosion resistance. On the other hand it reduces coating adhesion strength in case of flat substrate. In this study, the influence of residual stress on the bending strength of copper coating is investigated by stress release annealing. The coatings deposited with higher process gas temperature exhibited higher root bending strength. The stress relief annealing was able to remove residual stress without the coating microstructure changing. The occurrence position of residual stress can be divided to the particle-substrate interface and the inside of coating. In case of high process gas temperature, effect of residual stress of the coating inside is much higher than effect of particle-substrate one.
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