PSI - Issue 65

V.A. Bryzgalov et al. / Procedia Structural Integrity 65 (2024) 25–31 Bryzgalov V.A., Korznikova E.A. / Structural Integrity Procedia 00 (2024) 000–000

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Kiryc et al. (2021) employed Cr x O y atmospheric plasma sprayed (APS) and YSZ-CoNiCrAlY APS-high velocity oxy-fuel TBC coatings on a NiCr 20 Co 18 Ti superalloy substrate to examine the thermal behaviour and oxidation performance of Cr-based coatings at temperatures up to 900°C. Their findings indicated that the heat treatment was effective in enhancing the microhardness of the coatings. Furthermore, the Cr x O y coating layers demonstrated enhanced cohesion, which resulted in a reduction in crack susceptibility due to stress relief, phase transformation, sintering, and elemental diffusion. Additionally, the formation of a protective thermally grown Cr oxide layer was observed. Chromium coatings are widely used for their ability to form a protective oxide layer, which significantly improves the high-temperature oxidation resistance of superalloys. The compatibility of chromium with superalloys, due to its presence as a common alloying element, further enhances their effectiveness. However, the application methods and the precise control of chromium content are crucial to avoid potential drawbacks, such as excessive oxide growth. From the aforementioned review of Cr and Cr-based coatings several conclusions can be drawn: chromium-based coatings are of significant importance in improving the durability and functionality of superalloys in challenging environments. The choice of the most appropriate application method is dependent on a number of factors, including cost, component size and specific environmental conditions. Each method presents a distinctive set of advantages and challenges, which must be weighed against one another in order to achieve the most effective and appropriate level of protection. 4. Overlay Cr-based coatings The research was carried out with the support of the Ministry of Science and Higher Education of the Russian Federation within the framework of the State assignment “Study of physical and mechanical processes in the formation and strengthening of parts for aerospace and transport equipment” No. FEUE-2023-0006. References Babicheva, R., Jarlöv, A., Zheng, H., Dmitriev, S., Korznikova, E., Ling Sharon Nai, M., Ramamurty, U., Zhou, K., 2022. Effect of short-range ordering and grain boundary segregation on shear deformation of CoCrFeNi high-entropy alloys with Al addition. Computational Materials Science 215, 111762. https://doi.org/10.1016/j.commatsci.2022.111762 Banerjee, P., Roy, A., Sen, S., Ghosh, A., Saha, G., Seikh, A.H., Alnaser, I.A., Ghosh, M., 2023. Service life assessment of yttria stabilized zirconia (YSZ) based thermal barrier coating through wear behaviour. 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ISIJ Int. 52, 127– 133. https://doi.org/10.2355/isijinternational.52.127 Dossett, J.L., Totten, G.E. (Eds.), 2013. Pack Cementation Processes, in: Steel Heat Treating Fundamentals and Processes. ASM International, pp. 707–708. https://doi.org/10.31399/asm.hb.v04a.a0005775 Fähsing, D., Rudolphi, M., Konrad, L., Galetz, M.C., 2017. Fireside Corrosion of Chromium- and Aluminum-Coated Ferritic–Martensitic Steels. Oxid Met 88, 155–164. https://doi.org/10.1007/s11085-016-9684-2 Galetz, M.C., 2015. Coatings for Superalloys, in: Aliofkhazraei, M. (Ed.), Superalloys. InTech. https://doi.org/10.5772/61141 Acknowledgements