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Journal of Failure Analysis and Prevention

, Volume 13, Issue 3, pp 243–248 | Cite as

Failure Analysis of a Repaired Gas Turbine Nozzle

  • M. R. Shirpay
  • H. Kazempour-Liacy
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Abstract

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.

Keywords

Failure analysis Gas turbine nozzle Overheating X45 superalloy 

References

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    FIAT/TTG, Technical Information, Material X45,RT.21 (1985)Google Scholar
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    NRI Report of Gas Turbine Nozzles Failure, NRI-FRM 232/2366 (2008)Google Scholar
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    Gandy, D.: Combustion Turbine Guidelines: Conventional and Advanced, Machines: Siemens V84.2. EPRI Report No. 1010476 (2005)Google Scholar
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    Mazur, Z., Hernandez-Rossette, A., Garcia-Illescas, R., Luna-Ramirez, A.: Failure analysis of a gas turbine nozzle. Eng. Fail. Anal. 15, 913–921 (2008)CrossRefGoogle Scholar
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    Zangeneh, Sh, Farhangi, H.: Influence of service-induced microstructural changes on the failure of a cobalt- based superalloy first stage nozzle. Mater. Des. 31, 3504–3511 (2010)CrossRefGoogle Scholar

Copyright information

© ASM International 2013

Authors and Affiliations

  1. 1.Metallurgy DepartmentNiroo Research Institute (NRI)TehranIran

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