Abstract
The oxidation behaviour of a fourth-generation single-crystal superalloy without coating and with two types of MCrAlY coatings at 1140 °C was studied. The results showed that both coatings greatly improved the oxidation resistance of the superalloy, and the addition of Hf further improved the oxidation resistance by pinning the oxide layer into the coating. Before and after oxidation, obvious Cr and Al interdiffusion was detected. Inward Cr diffusion induces the precipitation of a topologically close-packed phase, while the diffusion of Al affects the structure of the γ/γ' phase, the solubility of refractory elements, and the formation of an interdiffusion zone.
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Acknowledgements
This work was supported by the National Science and Technology Major Project under Grant No. 2017-VI-0002-0072, the National Key Research and Development Program of China under Grant No. 2017YFA0700704, the National Natural Science Foundation of China (NSFC) under Grant Nos. 51671188 and 51771190, the Youth Innovation Promotion Association, Chinese Academy of Sciences and Innovation Academy for Light-duty Gas Turbine, and Chinese Academy of Sciences under Grant No. CXYJJ20-MS-03.
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K.J. Tan was the main contributor and was involved in the original draft preparation; J.J. Liang was involved in the conceptualisation and writing review and editing; X.G. Wang was involved in the methodology and conceptualisation; X.P. Tao was the experiment participator; J. Gong was involved in the resources and formal analysis; C. Sun was involved in the project administration and supervision; Y.Z. Zhou was involved in the project administration, funding acquisition, and supervision; X.F. Sun was involved in the funding acquisition and supervision.
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Tan, K.J., Liang, J.J., Wang, X.G. et al. Oxidation Performance and Interdiffusion Behaviour of two MCrAlY Coatings on a Fourth-Generation Single-Crystal Superalloy. Acta Metall. Sin. (Engl. Lett.) 35, 679–692 (2022). https://doi.org/10.1007/s40195-021-01287-1
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DOI: https://doi.org/10.1007/s40195-021-01287-1