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http://dx.doi.org/10.18770/KEPCO.2019.05.02.093

Quality Evaluation of the 1st Stage Scraped and Casted Buckets of 1,100℃ Gas Turbine Blade  

Chang, Sung Yong (KEPCO Research Institute, Korea Electric Power Corporation)
Kim, Doo Soo (KEPCO Research Institute, Korea Electric Power Corporation)
Publication Information
KEPCO Journal on Electric Power and Energy / v.5, no.2, 2019 , pp. 93-101 More about this Journal
Abstract
The mechanical properties and microstructure of 1st stage used and casted buckets of $1,100^{\circ}C$ class gas turbine were analyzed to evaluate quality of the components. Gas turbine 1st stage buckets are exposed and operated in the most severe environment except 1st nozzle among the hot path gas components. Additionally, since the 1st stage bucket is a rotating component, so it may cause additional damage to the rear buckets and nozzles which cause a huge financial loss. Therefore, the quality of the casted bucket must be evaluated prior to use at the plant site. In this study, the microstructure analysis and mechanical properties of the casted bucket were evaluated to verify the casting quality and it was confirmed that the quality conditions designed by KEPCO were satisfied. A bucket operated 46% (11,067EOH) of its life time also evaluated for quality comparison.
Keywords
Gas turbine; Bucket; Quality Evaluation;
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