Metallurgical examination of failed turbine rotor and stator blades fitted on an aeroengine

Bhaumik, SK (2004) Metallurgical examination of failed turbine rotor and stator blades fitted on an aeroengine. Project Report. National Aerospace Laboratories, Bangalore.

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Abstract

Fractured rotor blades and a segment of the stator of an aeroengine were sent to the laboratory to analyse the mode and cause of failure. Fractographic and microstructural studies, and hardness survey indicated that the turbine blades have failed by overload at elevated temperature. There were no evidences of delayed failure like fatigue. Also, there were no metallurgical abnormalities in the blade eliminating the possibility of any overheating. The microstructure and the hardness of the stator blades were found satisfactory. Since the turbine blades have not experienced temperatures more than the specified maximum working temperature, no microstructural or mechanical properties changes are expected. Hence it is not possible to estimate the temperature at which the turbine blades have failed. However, the failure of the turbine blades appear to be secondary in nature.

Item Type: Proj.Doc/Technical Report (Project Report)
Uncontrolled Keywords: Aeroengine;turbine rotor and stator blades;overload failure;microstructure;hardness;composition
Subjects: AERONAUTICS > Aeronautics (General)
CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Division/Department: Materials Science Division
Depositing User: Mrs Manoranjitha M D
Date Deposited: 27 Jul 2011 10:49
Last Modified: 27 Jul 2011 10:49
URI: http://nal-ir.nal.res.in/id/eprint/9681

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