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| Azevedo, Nuno Monteiro |
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Peat, Tom
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Topics
Publications (7/7 displayed)
- 2017The erosion performance of particle reinforced metal matrix composite coatings produced by co-deposition cold gas dynamic sprayingcitations
- 2017The erosion performance of cold spray deposited metal matrix composite coatings with subsequent friction stir processingcitations
- 2017Enhanced erosion performance of cold spray co-deposited AISI316 MMCs modified by friction stir processingcitations
- 2016Microstructural evaluation of cold spray deposited WC with subsequent friction stir processingcitations
- 2016Evaluation of the synergistic erosion-corrosion behaviour of HVOF thermal spray coatings
- 2016Cold gas dynamic spraying of metal matrix composite coatings with subsequent friction stir processing
- 2015Microstructural evaluation of cold spray deposited WC with subsequent friction stir processing
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article
Enhanced erosion performance of cold spray co-deposited AISI316 MMCs modified by friction stir processing
Abstract
The present study reports on the erosion properties of a novel surface engineering process combining cold spray and friction stir processing. Tungsten carbide (WC-CoCr) and aluminium oxide (Al2O3) powders were cold spray co-deposited with AISI316 using a twin powder feed system. The deposited coatings were subsequently friction stir processed to refine and redistribute the reinforcing particles and remove the coating-to-substrate interface layer, thus generating a new metal matrix composite surface. Microstructural analysis of the SprayStirred (cold sprayed then friction stirred) specimens revealed significant particle refinement and improved particle distribution over the as-deposited coatings. The erosion performance of these SprayStirred surfaces was evaluated using a flowing slurry and demonstrated an 80% decrease in volume loss over the as-received AISI316 at 30° angle of attack. For SprayStirred WC-CoCr, microhardness measurements indicated an increase of approx. 530% over the unaltered AISI316 and 100% over the cold sprayed coating. These findings highlight the considerable increase in erosion performance of the SprayStirred specimens, and thus demonstrate the benefits of this innovative surface engineering process. This outcome is attributed to dispersion strengthening, imparted by the refined tungsten carbides. Furthermore, the SprayStirred WC-CoCr coating exhibited an 85% reduction in volume loss over an HVOF sprayed WC-CoCr coating.