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Abstract
The components of gas-turbine engines operating in marine environments are highly susceptible to hot-corrosion, an aggressive mode o""f attack that is typically classified as Type II (650-750~C) and Type I (900-950~C), depending on the operating temperature. Even th""ough hot-corrosion has been widely investigated in the last 50 years, several critical questions remain unanswered and new ones have"" emerged based on recent observations that, in part, are associated with the increasing complexity of the alloy systems and the sulf"ate-deposit chemistries. This proposed project will have the following three main objectives. Advance understanding of complex (sulfates + oxides) deposit-induced degradation at both low (T<1000~C) and high temperatures (T>1000~C). This will include dual exposur"es, inwhich there is a cycling between low and high temperature or vice versa. Better determine the effects of microstructural and"" compositional factors of alloys and coatings on hot-corrosion behavior, particularly the initiation of attack. Further explore im"proving coating compositions and associated structures for optimized degradation resistance to multiple degradation modes. Related t"o this is determining a ~critical Cr content~ in chromium-rich coatings (e.g., PW70) beyond which hot corrosion resistance is good."Laboratory-scale hot-corrosion testing will be used throughout. The deposit chemistries will be guided by a parallel ONR-supported s"tudy involving analyses of corroded components pulled from service, together with prior assessments conducted at U Pitt. Tests will"" be conducted in air and air+trace SO2 (e.g., ~10 ppm) in order to gauge the importance of environmental SO2 in affecting the extent" and mode of corrosive attack. Collaboration with GE and Pratt and Whitney will be maintained during the course of the project to rapidly disseminate the results obtained and solicit constructive advice.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Sep 29, 2017
- Source ID
- N000141712917
Entities
People
- Brian T Gleeson
Organizations
- Office of Naval Research
- United States Navy
- University of Pittsburgh