Accession Number : ADA194268

Title :   JTDE I XTE34 Materials Research and Development Report,

Corporate Author : ALLIED-SIGNAL AEROSPACE CO PHOENIX AZ GARRETT ENGINE DIV

Personal Author(s) : Graham, A

PDF Url : ADA194268

Report Date : 15 Jan 1988

Pagination or Media Count : 28

Abstract : This report describes the materials research and development efforts conducted in support of the Joint Technology Demonstrator Engine (JTDE) Flowpath Test and Assessment (FTA) Program. The impeller run in the JTDE XTE34 was fabricated from the titanium alloy Ti 6-2-4-6. This component was originally intended to be a hollow, dual alloy impeller, which was needed to meet the design life goals for this engine. The dual alloy impeller concept used a creep resistant titanium alloy (Ti-5Al-6Sn-2Zr-1Mo + Si) for the backface and a high tensile and fatigue strength titanium alloy (Ti-6Al-2Sn-4Zr-2Mo + Si) for the hub and blades (Figure 1). In addition, internal cavities were generated during the fabrication sequence that significantly reduced the impeller weight and bore stresses. Additional GED-funded, materials R&D effort focused primarily on the HP compressor impeller, which had experienced a HCF failure in ATEGG testing, and on the LP turbine stator. Engine testing demonstrated that all materials behaved as intended and no material flaws or HCF initiation sites were found in any of the components examined after the XTE34 test program.

Descriptors :   *ENGINES, *TITANIUM ALLOYS, *TURBINES, ALLOYS, BORES, CAVITIES, COMPRESSOR COMPONENTS, CREEP STRENGTH, DEFECTS(MATERIALS), DEMONSTRATIONS, FABRICATION, IMPELLERS, INTERNAL, MATERIALS, SEQUENCES, TEST AND EVALUATION, TURBINE STATORS

Subject Categories : Machinery and Tools
      Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE