Failure analysis of steam turbine blade

Madan, M and Suresh Kumar, M and Venkataswamy, MA and Sujata, M and Parameswara, MA and Bhaumik, SK (2005) Failure analysis of steam turbine blade. Project Report. National Aerospace Laboratories, Bangalore.

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Abstract

The steam turbine blade in question had failed by fatigue. The fatigue crack had initiated at the trailing edge and propagated progressively towards the leading edge before giving rise to an overload failure. The fatigue appears to be of high cycle – low stress type. The investigation revealed pitting, corrosion and deposition of thick layer of SiO2 on the blade airfoil. The contamination of steam with SiO2 and Cl was responsible for pitting corrosion and subsequent fatigue crack initiation. No metallurgical and/or mechanical abnormalities were responsible for the fatigue crack initiation.

Item Type: Proj.Doc/Technical Report (Project Report)
Uncontrolled Keywords: Steam turbine blade;fatigue;steam contamination
Subjects: AERONAUTICS > Aeronautics (General)
CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Division/Department: Materials Science Division, Materials Science Division, Materials Science Division, Materials Science Division, Materials Science Division, Materials Science Division
Depositing User: Mrs Manoranjitha M D
Date Deposited: 25 Jul 2011 10:41
Last Modified: 25 Jul 2011 10:41
URI: http://nal-ir.nal.res.in/id/eprint/9570

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