Mechanical Performance of Cold-Sprayed A357 Aluminum Alloy Coatings for Repair and Additive Manufacturing
Autor: | K. Petráčková, Mario Guagliano, Jan Kondas |
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Rok vydání: | 2017 |
Předmět: |
Materials Chemistry2506 Metals and Alloys
Materials science Alloy Gas dynamic cold spray 02 engineering and technology A357 aluminum alloy cold spray fatigue limit heat treatment mechanical properties Condensed Matter Physics Surfaces Coatings and Films engineering.material Coatings and Films 0203 mechanical engineering Alonizing Coating Residual stress Ultimate tensile strength Materials Chemistry Composite material Metallurgy 021001 nanoscience & nanotechnology Fatigue limit Surfaces 020303 mechanical engineering & transports Casting (metalworking) engineering 0210 nano-technology |
Zdroj: | Journal of Thermal Spray Technology. 26:1888-1897 |
ISSN: | 1544-1016 1059-9630 |
Popis: | Cold-sprayed coatings made of A357 aluminum alloy, a casting alloy widely used in aerospace, underwent set of standard tests as well as newly developed fatigue test to gain an information about potential of cold spray for repair and additive manufacturing of loaded parts. With optimal spray parameters, coating deposition on substrate with smooth surface resulted in relatively good bonding, which can be further improved by application of grit blasting on substrate’s surface. However, no enhancement of adhesion was obtained for shot-peened surface. Process temperature, which was set either to 450 or 550 °C, was shown to have an effect on adhesion and cohesion strength, but it does not influence residual stress in the coating. To assess cold spray perspectives for additive manufacturing, flat tensile specimens were machined from coating and tested in as-sprayed and heat-treated (solution treatment and aging) condition. Tensile properties of the coating after the treatment correspond to properties of the cast A357-T61 aluminum alloy. Finally, fatigue specimen was proposed to test overall performance of the coating and coating’s fatigue limit is compared to the results obtained on cast A357-T61 aluminum alloy. |
Databáze: | OpenAIRE |
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