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Characterization of Foreign Object Damage in a Power Plant Gas Turbine by Scanning Electron Microscopy Technique

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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.

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Authors and Affiliations

  1. Metallurgy Department, Chemistry and Materials Research Center (CMRC), Niroo Research Institute (NRI), Tehran, Iran

    Aliakbar Fallah Sheykhlari, Mastaneh Moattari & Saeed Khani Moghanaki

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  1. Aliakbar Fallah Sheykhlari
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  2. Mastaneh Moattari
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  3. Saeed Khani Moghanaki
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Correspondence to Saeed Khani Moghanaki.

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Fallah Sheykhlari, A., Moattari, M. & Khani Moghanaki, S. Characterization of Foreign Object Damage in a Power Plant Gas Turbine by Scanning Electron Microscopy Technique. J Fail. Anal. and Preven. 20, 789–793 (2020). https://doi.org/10.1007/s11668-020-00876-z

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  • DOI: https://doi.org/10.1007/s11668-020-00876-z

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