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The present paper describes the findings of a failure investigation on the basis of metallographic
examination of Gas-Turbine blades of a 3MW power plant in the province of Punjab, Pakistan. Two
blades were randomly picked up for inspection from a lot of 61 blades that had been removed from the
turbine after annual inspection. The blades were removed on the recommendations of the inspectors
(from the manufacturers of turbine) according to which the blades had suffered from corrosion-fatigue
cracking at the inlet of the cooling air passage. The objective of the present examination was to
establish whether there were any cracks at the inlet of the cooling air passage, and in case any cracks
were present, what was the possible cause of such cracking. The investigation showed that cracking at
the air-inlet was not due to corrosion-fatigue, but instead the cracks were a manufacturing defect that
could be described as ‘solidification shrinkage’ cracks.
Liaqat Ali, Khalid M Ghauri, Faizul Hasan. (2011) Cracking Failure in GAS-Turbine Blades, Pakistan Journal of Engineering and Applied Sciences, Volume 9, Issue 1.
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