Fatigue Crack Growth in Bodies with Thermally Sprayed Coating

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• 作者：O. Kovářík ; P. Haušild ; J. Medřický ; L. Tomek…
• 关键词：Thermal barrier coating ; Fatigue ; Crack growth ; Digital image correlation ; Failure mechanism
• 刊名：Journal of Thermal Spray Technology
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：25
• 期：1-2
• 页码：311-320
• 全文大小：2,184 KB
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• 作者单位：O. Kovářík (1)
  P. Haušild (1)
  J. Medřický (1) (2)
  L. Tomek (1)
  J. Siegl (1)
  R. Mušálek (2)
  N. Curry (3)
  S. Björklund (3)
  
  1. Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Trojanova 13, 12000, Praha 2, Czech Republic
  2. Institute of Plasma Physics CAS, v.v.i, Za Slovankou 1782/3, 182 00, Praha 8, Czech Republic
  3. Production Technology West, University West, 461 86, Trollhättan, Sweden
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Surfaces and Interfaces and Thin Films
  Tribology, Corrosion and Coatings
  Materials Science
  Characterization and Evaluation Materials
  Operating Procedures and Materials Treatment
  Analytical Chemistry
  
• 出版者：Springer Boston
• ISSN：1544-1016

文摘

Many applications of thermally sprayed coatings call for increased fatigue resistance of coated parts. Despite the intensive research in this area, the influence of coating on fatigue is still not completely understood. In this paper, the localization of crack initiation sites and the dynamics of crack propagation are studied. The resonance bending fatigue test was employed to test flat specimens with both sides coated. Hastelloy-X substrates coated with classical thermal barrier coating consisting of yttria stabilized zirconia and NiCoCrAlY layers. The strain distribution on the coating surface was evaluated by the Digital Image Correlation method through the whole duration of the fatigue test. Localization of crack initiation sites and the mode of crack propagation in the coated specimen are related to the observed resonance frequency. The individual phases of specimen degradation, i.e., the changes of material properties, crack initiation, and crack propagation, were identified. The tested coatings strongly influenced the first two phases, and the influence on the crack propagation was less significant. In general, the presented crack detection method can be used as a sensitive nondestructive testing method well suited for coated parts.