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3804 |
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Residual stress formation in cold sprayed Al, Cu and Ti coatings |
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Tomi Suhonen* / VTT Technical Research Centre of Finland, Finland Tommi Varis / VTT Technical Research Centre of Finland, Finland Sergi Dosta/ Barcelona University, CPT, Spain Marc Torrell/ Barcelona University, CPT, Spain Jose Maria Guilemany/ Barcelona University, CPT, Spain |
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Residual stresses play an important role in the formation and performance of thermal spray coatings. A curvature based approach where substrate/coating system deflection and temperature are monitored throughout the coating deposition process was used to determine residual stress formation during cold spray deposition of Al-, Cu- and Ti-coatings. The effect of substrate material (carbon steel, stainless steel and aluminium) and substrate pre-treatment (normal grit blasting, grit blasting with the cold spray system and grinding) were studied for all coating materials with optimized deposition parameters. Mainly compressive stresses were expected because of the nature of cold spraying, but also neutral as well as tensile stresses were formed for studied coatings. The magnitude of residual stresses were mainly dependent on substrate/coating material combination, but also the surface preparation was found to effect on the final stress stage of the coating. |