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Shot Peening Process of CoCrAlY Coatings Prepared by EB-PVD |
Limin HE1(), Zhonghua DENG1,2, Guanghong HUANG1, Zhendong CHANG1, Qibin LIU2 |
1 Research Institute of Surface Engineering, Beijing Institute of Aeronautical Materials, Beijing 100095, China 2 College of Materials and Metallurgy, Guizhou University, Guiyang 550025, China |
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Cite this article:
Limin HE, Zhonghua DENG, Guanghong HUANG, Zhendong CHANG, Qibin LIU. Shot Peening Process of CoCrAlY Coatings Prepared by EB-PVD. Chinese Journal of Materials Research, 2018, 32(7): 525-532.
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Abstract In order to investigate the isothermal oxidation performance of CoCrAlY coatings prepared by EB-PVD after high energy shot peening process with different intensity, the CoCrAlY coatings on high temperature alloy DZ466 were surface shot peened with intensity of 0.1 N, 0.2 N, 0.3 N and 0.45 N. The shot peened coatings were characterized in terms of surface morphology, surface roughness, surface residual stress, thickness and cross-sectional hardness and phase composition, as well as isothermal oxidation behavior in air at 1050℃. Results show that the isothermal oxidation resistance of CoCrAlY coating prepared by EB-PVD is greatly improved after surface shot peening with intensity of 0.1 N. When the shot peening intensity is greater than or equal to 0.45 N, the coating is damaged, which degrades the isothermal oxidation performance of the CoCrAlY coating. The suitable shot peening intensity can decrease the surface roughness, whilst increase the density and change the phase composition of the CoCrAlY coating, and so that lead to the improvement of isothermal oxidation performance of the CoCrAlY coating. When the shot peening intensity is greater than or equal to 0.3 N, scale-shaped bulges formed on the surface of CoCrAlY coating, resulting in preferential growth of Al-oxide there. Because of the rupture of Al-oxide film induced by stress concentration in this place, the service life of coating is degraded.
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Received: 14 June 2017
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Fund: Supported by National High Technology Research and Development Program of China (No. 2015AA034403) and Science and Technology Cooperation of Guizhou Province (No. LH[2015]7650) |
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