Turbine blade failure in a thermal power plant

Das, Goutam and Ghosh Chowdhury, S and Ray, Ashok K and Das, Swapan K and Bhattacharya, D K (2003) Turbine blade failure in a thermal power plant. Engineering Failure Analysis, 10 (1). pp. 85-91.

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The failure of a LP (low pressure) turbine blade of a 220 MW thermal power plant is presented. The blade was made of martensitic stainless steel and the structure was tempered martensite. There was no evidence of degradation of blade material. The fracture took place at the aerofoil region, 113-mm from the root. Throughout the blade surface Si rich phases were detected. Several pits/grooves were found on the edges of the blades and chloride was detected in these pits. These were responsible for the crevice type corrosion. The probable carriers of Cl− were Ca and K, which were found on the blade. The failure mode was intergranular type. Possibly the ultimate failure was due to corrosion-fatigue.

Item Type:Article
Official URL/DOI:http://dx.doi.org/10.1016/S1350-6307(02)00022-5
Uncontrolled Keywords:Turbine blade; Corrosion fatigue; Failure analysis; Fractography; Intergranular fracture
Divisions:Material Science and Technology
ID Code:279
Deposited On:17 Nov 2009 09:59
Last Modified:14 Dec 2011 12:58
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