Study by X-ray diffraction and mechanical analysis of the residual stress generation during thermal spraying
J. Pina, A. Dias, J.L. Lebrun
Materials Science
Abstract
Thermally sprayed coatings are formed by the deposition of molten or partially molten particles, propelled onto a substrate where they impact, spread and solidify rapidly. Residual stresses are expected within the sprayed deposit as a consequence of the release of thermal and kinetic energies. A wide range of materials and two spraying techniques are considered in this study, namely atmospheric plasma spraying (APS) and high-velocity oxygen fuel. Stresses were determined by the X-...Moreray diffraction (XRD)method. The results were compared with those calculated by mechanical analysis of stress relief in coatings detached from the substrate. Comparison of the results for adherent and free-standing coatings shows that the residual stress state can be resolved in terms of the components suggested by models that propose two stages of stress generation: quenching stresses and econdarycooling stresses. The in-depth distribution of residual stresses, through the coating thickness, is discussed in terms of the nature of the coating system.
keywords:Residual stresses; Atmospheric plasma spraying; Thermal spray coatings; High velocity oxygen fuel; X-ray stress evaluation
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