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The mechanical properties of fine grain Microcast-X@ investment cast Alloy 718 Space Shuttle Main Engine (SSME) turbopumps, gas turbine engine, and airframe components are compared to the test bar data from cast-to-size bars and slab data generated in 1987-88. The SSME structural components made by P&W are now being used during shuttle flights, and gas turbine engine components (for aero and land-base engines) are now in process development. Airframe components of varying thickness (simulated with cast slabs) have also been evaluated by Boeing. Tensile, stress rupture, and high and low cycle fatigue properties of these components in the temperature range of -320F to IOOOF (-196C to 5386) are discussed with regard to the Microcast-X Alloy 718 process capability.

Mechanical Properties of Fine-Grain Microcast-X Alloy 718 Investment Castings for SSME, Gas Turbine Engine, and Airframe Components