Failure Analysis of LP turbine free standing blade

Ghosh Chowdhury, S and Das, Goutam and Das, Swapan K and Sivaprasad, S and Singh, S R and Ghosh, R N (2007) Failure Analysis of LP turbine free standing blade. Sponsored (SSP). CSIR-NML, Jamshedpur. (Submitted)

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A 210MW turbine blade failed prematurely. It is a free standing blade. The blade failed at 250mm from the tip. The failed blade along with a deformed portion were sent to NML to find out the cause of the failure. The material of the blade is hardened and tempered martensitic microstructure; it shows no degradation. The mechanical property of the blade material is nearly similar to that of the standard alloy of similar nature. Fractographic analysis of the blade shows no intergranular mode of deformation. The fracture surface consists of embedded silica particles as well as blisters associated with chlorine. It has been concluded that the blade failed due to initiation of cracks by chloride assisted corrosion with silica particle impingement. Later these cracks grow under fatigue loading and lead to failure of the blade.

Item Type:Project Reports (Sponsored (SSP))
Official URL/DOI:
Uncontrolled Keywords:turbine blade; failure analysis; chloride attack; fatigue
Divisions:Material Science and Technology
ID Code:6502
Deposited By:Sahu A K
Deposited On:12 Jul 2013 10:23
Last Modified:12 Jul 2013 10:23
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