Abstract
Neutron tomography with Gd tagging has been developed for application to in-service turbine blades to ensure theirs maintainability. Hot corrosion was detected in the air channels of 13 % of in-service blades. Hot corrosion occurs in clusters of about 15 mm in diameter. The size of individual hot corrosion features was determined to be in the range of 0.8–2.81 mm by neutron tomography. Turbine blades with indications of flaws were crosscut with a wire for internal verification. Scanning electron microscopy revealed that hot corrosion occurs in scattered groups with multiple pits of about 150 $$\upmu $$ m in size in the channels. The analyzed oxygen content of the corroded surface was over 30 wt% higher when compared with new turbine blades by energy dispersive X-ray spectroscopy. These findings may play a pivotal role in curtailing in-service turbine blade failure due to internal corrosion of cooling channels. Applying these results with neutron tomography on in-service turbine blades can lead to more reliable determinations of condemnation.
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