SYMPOSIA PAPER Published: 01 January 2000
STP14750S

Influence of Surface Treatments on Fretting Fatigue of Ti-6242 at Elevated Temperatures

Source

Where fretting fatigue of titanium alloy gas turbine engine component is concerned, the effect of temperature on fretting processes can be quite significant. Service exposed third stage compressor blades, operating at 454°C or 850°F, showed severe signs of fretting, wear, CuNiln coating delamination, oxidation and pitting on the dovetail pressure surfaces. Under cyclic loading conditions fretting fatigue cracks, initiated in these damaged areas, can cause dramatic reduction in fatigue life of these components leading to potential catastrophic failure. A study has been carried out to evaluate the influence of various surface treatments, such as ion treatments, coatings and shot peening, on the fretting fatigue life of titanium alloy gas turbine engine components at elevated temperature. Results from high temperature fretting fatigue and pin-on-disk wear tests are discussed in this paper. Significant contrast between the wear and fatigue test results illustrates the potential dangers of using sliding wear tests to rank surface treatments for fretting fatigue amelioration.

Author Information

Chakravarty, S
Advanced Material and Energy Systems, Orenda Aerospace Corporation, Gloucester, Ont., Canada
Dyer, JP
Advanced Material and Energy Systems, Orenda Aerospace Corporation, Gloucester, Ont., Canada
Conway, JC
Applied Research Laboratory, The Pennsylvania State University, PA
Segall, AE
Washington State University-Vancouver, Vancouver, Washington
Patnaik, PC
Advanced Material and Energy Systems, Orenda Aerospace Corporation, Gloucester, Ont., Canada
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Details
Developed by Committee: E08
Pages: 491–505
DOI: 10.1520/STP14750S
ISBN-EB: 978-0-8031-5420-9
ISBN-13: 978-0-8031-2851-4