Failure Analysis of a Repaired Gas Turbine Nozzle
- 249 Downloads
The failure analysis of a 32.5 MW first-stage gas turbine nozzle made of cobalt-base X45 superalloy is presented. It was found that nozzle airfoil failed as a result of exposure to high temperatures. The overheating experienced by the airfoil damaged the impingement cooling system and degraded the microstructure. Also, processing during repair played an important role in the failure of the nozzle.
KeywordsFailure analysis Gas turbine nozzle Overheating X45 superalloy
- 1.FIAT/TTG, Technical Information, Material X45,RT.21 (1985)Google Scholar
- 2.NRI Report of Gas Turbine Nozzles Failure, NRI-FRM 232/2366 (2008)Google Scholar
- 3.Gandy, D.: Combustion Turbine Guidelines: Conventional and Advanced, Machines: Siemens V84.2. EPRI Report No. 1010476 (2005)Google Scholar