Applied High Temperature Technology Program. Volume II. Evaluation of Coated Columbium Alloys for Advanced Turbine Airfoils.
Final technical rept. 1 Jun 71-31 Jan 75,
PRATT AND WHITNEY AIRCRAFT EAST HARTFORD CONN
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This report covers the columbium alloy evaluation. The objective of these evaluations was to determine the applicability of coated columbium alloys for advanced gas turbine vanes. The alloy SU-31 Cb-17W-3.5 Hf-0.1C was selected for evaluation following screening of wrought and cast alloys using the criteria of creep resistance at 2400F and fabricability. Hi Temp Co. R512E Si-20Cr-20Fe silicide coating was selected for this program. Mechanical and physical properties were determined and oxidation resistance was evaluated. Cast and wrought SU-31 vanes were fabricated and tested under simulated engine conditions. Based on the results of these evaluations, it was concluded that relatively poor cyclic oxidation and thermal fatigue properties are likely to prevent extended use of R512E coated SU-31.
- Metallurgy and Metallography
- Jet and Gas Turbine Engines