Udimet@ 720 is an important alloy because it exhibits an outstanding balance of strength, temperature, and defect tolerance characteristics (Ref. 1). In its cast and wrought alloy form, it is employed for turbine disk components utilized in a large number of civil and military propulsion systems. In its powder metal (PM) alloy form, which has been shown to be very cost competitive with its cast and wrought counterpart, Udimet 720 exhibits superior alloy homogeneity that provides an opportunity to develop the uniform and controlled microstructures desired for advanced designs (Ref. 2). Because it was recognized that Udimet 720 compositions developed for cast and wrought applications were not necessarily the best for PM processing, it was decided to study PM Udimet 720 chemistry, processing, and mechanical property relationships. The goal of this effort was to determine if an improved balance of performance characteristics could be developed for advanced turbine disk applications. For this work, four Udimet 720 chemistry modifications involving boron, zirconium, and hafnium additions were made to the baseline composition. Also represented in the program, for reference, was a contemporary baseline PM Udimet 720 composition.

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This paper deals with Allison's work with the MA 6000 alloy aimed at near-net-shape forgings and thermal protection coatings for uncooled turbine blade applications.

Recent advances in the field of powder metallurgy have made possible the production of alloy powders exhibiting high levels of purity. By appropriate consolidation and subsequent thermomechanical processing, it has been possible to produce segregation free wrought forms of high alloy content which exhibit attractive mechanical properties for gas turbine a.pplications.

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