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Over the thirty years for which powder metal processing was applied in the production of superalloy turbine disk components, many advancements in the understanding of powder processing and applications have evolved. In this regard, a major shift to finer powder sizes has driven manufacturers to investigate advanced powder processing routes to minimize alloy costs. In addition, major advancements in understanding component temperature and strength capability have permitted improvements in designs that extend the ultimate performance of the turbine under extreme operating conditions. In this investigation, the powder UDIMETB Alloy 720 was produced using an advanced gas atomization nozzle in combination with process improvements consisting of hot isostatic pressing and low ratio extrusion to develop fine grain microstructures for subsequent isothermal forging to a low pressure turbine disk. The disks were evaluated both non-destructively to assess the ultrasonic inspection capability and destructively to demonstrate mechanical property capability.

The Mechanical Property Response of Turbine Disks Produced Using Advanced PM Processing Techniques