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| Content Provider | The American Society of Mechanical Engineers (ASME) Digital Collection |
|---|---|
| Author | Krzywosz, Kenji Viswanathan, Vis |
| Copyright Year | 2003 |
| Abstract | EPRI is involved in a multi-year program to test, evaluate, and develop a field-deployable eddy current NDE system for life assessment of blade coatings for advanced gas turbines. An eddy current system was assembled and tested on service-aged 7FA first stage blade buckets, which were coated with GT 33+ duplex metallic coatings. Testing of transverse cutout sections showed presence of normal coating, coating degradation due to β-phase depletion, and cracked coatings with some cracks penetrating into the GTD-111 substrate. By plotting normalized multiple-frequency eddy current coil impedance values, the eddy current technique was able to assess and provide the following coating and airfoil conditions: 1) normal coating; 2) degraded coating; 3) cracked coating; and 4) possible corrosion of GTD-111 substrate. Using a built-in three-layer inversion program, conductivity values of topcoat, bond coat, and GTD-111 substrate were also estimated using aged blade buckets. |
| Sponsorship | International Gas Turbine Institute |
| Starting Page | 633 |
| Ending Page | 639 |
| Page Count | 7 |
| File Format | |
| ISBN | 079183686X |
| DOI | 10.1115/GT2003-38749 |
| e-ISBN | 0791836711 |
| Volume Number | Volume 3: Turbo Expo 2003 |
| Conference Proceedings | ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference |
| Language | English |
| Publisher Date | 2003-06-16 |
| Publisher Place | Atlanta, Georgia, USA |
| Access Restriction | Subscribed |
| Subject Keyword | Nondestructive evaluation Eddy currents (electricity) Electrical conductivity Gas turbines Blades Corrosion Eddies (fluid dynamics) Airfoils Thermal conductivity Fracture (materials) Coatings Testing |
| Content Type | Text |
| Resource Type | Article |
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