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Microstructure changes of cobalt base superalloy primary nozzle during high temperature service

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Document pages: 7 pages

Abstract: Superalloys are a group of nickel, iron or cobalt based alloys used for operation at high temperatures (> 540 ° C) and under extremely high stress conditions such as gas turbines, especially in the manufacture of blades, nozzles, combustion chambers and discs. In addition to maintaining their high temperature resistance (close to 85 of their melting temperature), these materials also have excellent corrosion resistance and oxidation resistance. However, after long-term use, these parts will undergo mechanical and microstructure degradation; The latter is considered to be the main reason for replacing the main components of the gas turbine. After a certain working time, the replacement cost of these components is very high, so microstructure analysis is an important tool to determine the mode of microstrip lineture degradation, residual lifetime estimation, and operating temperature and most important to determine the method of rehabilitation for extending its life. Microstructural analysis can avoid catastrophic failures and optimize the operating mode of the turbine. A case study is presented in this paper.

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