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This paper describes the evaluation of three superalloys-lN718, IN939, and RSS-cast using a new technology called thermally controlled solidification (KS). The TCS casting technology enables the casting of large, complex, thin-walled components which have heretofore been impossible to cast with conventional investment casting methods. The characteristics of the candidate alloys in the TCS cast condition were analyzed for castability, weld reparability, microstructure, thermal stability, and mechanical properties. The RS5 alloy, recently patented, was also examined to optimize post-casting heat treatment. The goal of this evaluation was to select the best alloy with which to conduct a component demonstration as part of a U.S. Navy manufacturing technology program. While all the alloys demonstrated adequate castability and weld reparability, the alloy identified as the best candidate was RS5. This decision was based on the superior tensile properties of TCS cast RS5.

Properties of RS5 and Other Superalloys Cast Using Thermally Controlled Solidification