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- Title
Characterization of Foreign Object Damage in a Power Plant Gas Turbine by Scanning Electron Microscopy Technique.
- Authors
Fallah Sheykhlari, Aliakbar; Moattari, Mastaneh; Khani Moghanaki, Saeed
- Abstract
In the present study, a first stage rotor blade failure in a 160 MW gas turbine is investigated. This failure was occurred during first startup after major overhaul, and new blades were utilized for all rotor blades and vanes. The damaged rotor blade is examined by scanning electron microscope (SEM) equipped by energy-dispersive x-ray spectroscopy (EDS) detector. SEM images and EDS chemical analyses illustrate that concentration of Fe element is unusually high in the damaged zone. The rotor blade is made by Ni-based superalloy (IN738LC) that the Fe content is very low. This high Fe content suggests that the governing failure mechanism is foreign object damage due to steel part distribution through the hot gas path. Unfortunately, this steel part has been remained within the hot section of the turbine during overhaul.
- Subjects
GAS power plants; SCANNING electron microscopy techniques; FOREIGN bodies; GAS turbines; SCANNING electron microscopes
- Publication
Journal of Failure Analysis & Prevention, 2020, Vol 20, Issue 3, p789
- ISSN
1547-7029
- Publication type
Article
- DOI
10.1007/s11668-020-00876-z