Accession Number : ADA018638

Title :   Applied High Temperature Technology Program. Volume II. Evaluation of Coated Columbium Alloys for Advanced Turbine Airfoils.

Descriptive Note : Final technical rept. 1 Jun 71-31 Jan 75,

Corporate Author : PRATT AND WHITNEY AIRCRAFT EAST HARTFORD CONN

Personal Author(s) : Hayes,Charles W. ; Jackson,J. J.

Report Date : OCT 1975

Pagination or Media Count : 168

Abstract : 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.

Descriptors :   *Turbine parts, *Niobium alloys, Refractory coatings, Silicides, Gas turbines, Vaneaxial fans, Airfoils, Mechanical properties, Physical properties, Oxidation resistance, High temperature

Subject Categories : Metallurgy and Metallography
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE