Mechanical and microstructural/chemical degradation of coating and substrate in gas turbine blade [electronic resource].
- Washington, D.C. : United States. Dept. of Energy, 1995.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- 10 pages : digital, PDF file
- Additional Creators:
- Ames Laboratory
United States. Department of Energy
United States. Department of Energy. Office of Scientific and Technical Information
- The mechanical property degradation (295--1223 K) and microstructural/chemical evolution of CoNiCrAlY coatings and superalloy (Rene 80) substrates in gas turbine blades operated in- service have been studied using a small punch (SP) testing technique and scanning Auger microprobe. In SP tests, coating cracks continuously and discretely propagated at 295 K and higher temperatures, respectively. The ductile-brittle transition temperature of the coatings was increased during long time exposure of gas turbine blades to oxidizing environments while that of the substrate did not change. The low cycle fatigue life of the coatings at 295 K was also reduced in-service. Oxidation and sulfur segregation near the coating surface were found to be major causes of the mechanical degradation of the coatings.
- Published through SciTech Connect.
International symposium on materials aging and component life extension, Milan (Italy), 10-13 Oct 1995.
Ito, M.; Sakurai, S.; Kameda, J.; Gold, C.R.; Bloomer, T.E.; Sugita, Y.
- Funding Information:
View MARC record | catkey: 14152780