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| Abstract No.: |
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Scheduled at:
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Tuesday, September 27, 2011, Saal C2.2 3:15 PM
Characterization & Testing 1
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| Title: |
Effect of vacuum heat treatment on tensile strength and fracture performance of cold-sprayed Cu-4Cr-2Nb coatings
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| Authors: |
Min Yu* / LERMPS, Université de Technologie de Belfort-Montbéliard, Site de Sévenans, France
Wenya Li / Shaanxi Key Laboratory of Friction Welding Technologies, School of Materials Science and Engineering, Northwestern Polytechnical University, China
Chao Zhang/ Service de Science des Matériaux, Faculté Polytechnique, Université de Mons, Germany
Hanlin Liao/ LERMPS, Université de Technologie de Belfort-Montbéliard, Site de Sévenans, France
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| Abstract: |
The previous study [1] indicated that dense thick Cu-4Cr-2Nb coatings could be formed by cold spraying, and the post-spray heat treatment could significantly influence the microstructure and microhardness of the as-sprayed Cu-4Cr-2Nb coatings. In this study, the tensile strength and fracture performence of the Cu-4Cr-2Nb coatings after annealing were investigated. The vacuum heat treatment was conducted under 10-2 Pa at 850ºC for 4 h. Results showed that the heat treatment had a great contribution to the healing-up of the incompleteness of the interfaces between the deposited particles. In addition, the coating microhardness decreased from 156.8±4.6 Hv0.2 for the as-sprayed coatings to 101.7±4.5 Hv0.2 for the annealed ones. The mean tensile strength of the annealed coatings was approximately 298.8±31.5 MPa compared to that of 45±10.5 MPa for the as-sprayed ones, which results from the partially metallurgically bonded zones between the deposited particles inducing by the heat treatment process.
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