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6298 |
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Thursday, June 11, 2020, Hall G1 11:00 AM Pre- & Posttreatment |
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Influence of cold spray nozzle displacement strategy, heat treatment and friction stir processing on microstructure and mechanical properties of Cu/SiC composites coating |
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Hussein Hammoud* / ENISE, France Alexey Sova/ ENISE, France Zineb Bensaid/ EMSE, France Guillaume Kermouche/ EMSE, France Helmut Klöcker/ EMSE, France Cédric Bosch/ EMSE, France Nathalie Texier-Mandoki/ ANDRA, France |
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In this work, the influence of cold spray nozzle displacement parameters, heat treatment (HT) and friction stir processing (FSP) on the microstructure and properties of copper-silicon carbide cold spray deposits is considered. In particular, the influence of three heat treatment temperatures (250, 450 and 650°C) and two heat treatment durations (2 and 6 hours) as well as FSP process parameters was analyzed. In addition, the influence of nozzle traverse speed and distance between deposited tracks on the coating porosity and behavior during compressive tests was also analyzed. As a consequence, the HT duration has no significant contribution on several mechanical properties such as micro-hardness, compressive and tensile ultimate strength. In addition, the FSP has a marked effect on the microstructure in which SiC particles have a uniform distribution and the particles boundaries turn invisible whereas the micro-hardness becomes higher in the zone attacked by FSP. Moreover, the particle deformation at impact on the track periphery becomes insufficient and local porosity value rises. Increase of nozzle traverse speed allows increasing coating density and mechanical properties due to amelioration of particle deformation conditions. Compressive tests revealed significant anisotropy of mechanical properties of copper-silicon carbide cold spray deposits. This anisotropy could be explained by the orientation of particle deformation pattern during impact. |