Details
| Translated title of the contribution | Zerstörungsfreie Materialcharakterisierung und Fehlerprüfung von Hochleistungsbauteilen |
|---|---|
| Original language | Multiple languages |
| Pages (from-to) | 59-67 |
| Number of pages | 9 |
| Journal | HTM - Journal of Heat Treatment and Materials |
| Volume | 68 |
| Issue number | 2 |
| Publication status | Published - 2013 |
Abstract
In modern aircrat engines, a high number of complex highperformance components are employed, which are partly subjected to extreme loading. For instance, the high-pressure turbine blades of the first stage ater the combustor are both thermallymechanically loaded and experience severe corrosive attack. Therefore they are furnished with several protective systems in order to improve the fatigue life and reliability of the high-temperature material blades employed. A ceramic thermal barrier coating insulates the internally and film-cooled blades against the hot gas stream whilst the underlying layer (PtAl, Al, MCrAlY) protects the substrate material against corrosive attack and oxidation. Owing to the low electrical conductivity of the materials employed in the multilayered system of the high-pressure turbine blades with layer thicknesses of 20-150 μm, conventional eddy-current and thermographic technologies are only suitable to a limited extent to non-destructively detect the condition of the individual layers separately from the substrate material. In contrast to this, with the aid of multi-parameter, high-frequency eddy-current technologies and high-frequency induction thermography using pulsed excitation, the eddy-currents with test frequencies in the mega-Hertz range (up to 100 MHz) can be limited to the near subsurface and produce standard penetration depths of <50 μm; which enables the layer and substrate materials to be diferentially studied. The objective of the present study was to non-destructively detect the condition of the coatings, to characterise and determine the thickness of the coating as well as to detect the condition of the substrate material and sensitively analyse local damage and defects.
Keywords
- Coating characterisation, Damage detection, Eddy-current technology, High frequency testing, High performance parts, Material characterisation, Non-destructive testing, Pulsed induction thermography, Turbine blades
ASJC Scopus subject areas
- Engineering(all)
- Industrial and Manufacturing Engineering
- Materials Science(all)
- Metals and Alloys
- Materials Science(all)
- Materials Chemistry
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In: HTM - Journal of Heat Treatment and Materials, Vol. 68, No. 2, 2013, p. 59-67.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Non-destructive determination of local damage and material condition in high-performance components
AU - Reimche, W.
AU - Bruchwald, O.
AU - Frackowiak, W.
AU - Bach, Fr W.
AU - Maier, H. J.
PY - 2013
Y1 - 2013
N2 - In modern aircrat engines, a high number of complex highperformance components are employed, which are partly subjected to extreme loading. For instance, the high-pressure turbine blades of the first stage ater the combustor are both thermallymechanically loaded and experience severe corrosive attack. Therefore they are furnished with several protective systems in order to improve the fatigue life and reliability of the high-temperature material blades employed. A ceramic thermal barrier coating insulates the internally and film-cooled blades against the hot gas stream whilst the underlying layer (PtAl, Al, MCrAlY) protects the substrate material against corrosive attack and oxidation. Owing to the low electrical conductivity of the materials employed in the multilayered system of the high-pressure turbine blades with layer thicknesses of 20-150 μm, conventional eddy-current and thermographic technologies are only suitable to a limited extent to non-destructively detect the condition of the individual layers separately from the substrate material. In contrast to this, with the aid of multi-parameter, high-frequency eddy-current technologies and high-frequency induction thermography using pulsed excitation, the eddy-currents with test frequencies in the mega-Hertz range (up to 100 MHz) can be limited to the near subsurface and produce standard penetration depths of <50 μm; which enables the layer and substrate materials to be diferentially studied. The objective of the present study was to non-destructively detect the condition of the coatings, to characterise and determine the thickness of the coating as well as to detect the condition of the substrate material and sensitively analyse local damage and defects.
AB - In modern aircrat engines, a high number of complex highperformance components are employed, which are partly subjected to extreme loading. For instance, the high-pressure turbine blades of the first stage ater the combustor are both thermallymechanically loaded and experience severe corrosive attack. Therefore they are furnished with several protective systems in order to improve the fatigue life and reliability of the high-temperature material blades employed. A ceramic thermal barrier coating insulates the internally and film-cooled blades against the hot gas stream whilst the underlying layer (PtAl, Al, MCrAlY) protects the substrate material against corrosive attack and oxidation. Owing to the low electrical conductivity of the materials employed in the multilayered system of the high-pressure turbine blades with layer thicknesses of 20-150 μm, conventional eddy-current and thermographic technologies are only suitable to a limited extent to non-destructively detect the condition of the individual layers separately from the substrate material. In contrast to this, with the aid of multi-parameter, high-frequency eddy-current technologies and high-frequency induction thermography using pulsed excitation, the eddy-currents with test frequencies in the mega-Hertz range (up to 100 MHz) can be limited to the near subsurface and produce standard penetration depths of <50 μm; which enables the layer and substrate materials to be diferentially studied. The objective of the present study was to non-destructively detect the condition of the coatings, to characterise and determine the thickness of the coating as well as to detect the condition of the substrate material and sensitively analyse local damage and defects.
KW - Coating characterisation
KW - Damage detection
KW - Eddy-current technology
KW - High frequency testing
KW - High performance parts
KW - Material characterisation
KW - Non-destructive testing
KW - Pulsed induction thermography
KW - Turbine blades
UR - http://www.scopus.com/inward/record.url?scp=84879076756&partnerID=8YFLogxK
U2 - 10.3139/105.110176
DO - 10.3139/105.110176
M3 - Article
AN - SCOPUS:84879076756
VL - 68
SP - 59
EP - 67
JO - HTM - Journal of Heat Treatment and Materials
JF - HTM - Journal of Heat Treatment and Materials
SN - 1867-2493
IS - 2
ER -