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Failure analysis of gas turbine buckets

✍ Scribed by Jung-Chel Chang; Young-Hoon Yun; Chel Choi; Jae-Chul Kim

Publisher
Elsevier Science
Year
2003
Tongue
English
Weight
756 KB
Volume
10
Category
Article
ISSN
1350-6307

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✦ Synopsis

The failure of a gas turbine first stage bucket was investigated by visual inspection and finite element analysis. The failure of a major bucket cooling passage was a critical cause of the separation of a bucket segment and caused microstructural deterioration of the neighboring regions by serious thermal load. Changes of microstructural morphologies of the damaged buckets under the thermal and mechanical stress were observed. After coating stripping, the bucket surface condition was evaluated through visual inspection and finite element analysis. The TMF (thermalmechanical fatigue) cracking of surface coatings on the suction and pressure sides of the bucket was described.

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