Failure analysis of compressor rotor blades of 500 MW generator

Suresh Kumar, M and Madan, M and Venkataswamy, MA and Manjunatha, CM and Ranganath, VR and Sujata, M and Bhaumik, SK (2006) Failure analysis of compressor rotor blades of 500 MW generator. Project Report. National Aerospace Laboratories, Bangalore, India.

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Abstract

Fractographic examination showed that eight blades out of nine blades have failed by fatigue. The ninth blade has failed by overload and this failure might have occurred subsequent to the primary fatigue failure in the other eight blades. Fractographic features on the fatigue fracture surfaces indicated unusual load spectra on the blades. Analysis suggests that the blades were subjected to high load peaks intermittently during the entire service life. It appears most probable that these high load pulses were responsible for the premature fatigue crack initiation in the blades. However, with the available evidences, it was not possible to establish the reason (s) for such load spectra on the blades. The blade material was found to conform to specification in terms of composition, microstructure and hardness. A detailed analysis of the failure has been presented in this report.

Item Type: Proj.Doc/Technical Report (Project Report)
Uncontrolled Keywords: 500 MW generator;Compressor rotor blades;X20Cr13 steel; Fatigue;Load pulses
Subjects: AERONAUTICS > Aeronautics (General)
CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Division/Department: Materials Science Division, Materials Science Division, Materials Science Division, Structural Integrity Division, Structural Integrity Division, Materials Science Division, Materials Science Division
Depositing User: Ms. Alphones Mary
Date Deposited: 29 Jul 2011 11:47
Last Modified: 29 Jul 2011 11:47
URI: http://nal-ir.nal.res.in/id/eprint/9725

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