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Recent interest in nuclear high temperature reactor combined with a closed-cycle helium gas turbine provides the need for developing creep-resistant superalloys for the turbine disks and blades. Superalloy Udimet 720LI TM has been selected as a candidate material to produce the large diameter turbine disks because of its high creep strength and industrial maturity. Studies were performed on both Powder Metallurgy (P/M) and Cast & Wrought (C&W) billet samples. The effort was focussed on tailoring the microstructure to ensure a high creep strength and a good thermal stability. A new P/M process route has been developed to increase the grain size of the alloy and to ensure a good workability of P/M U720 with conventional forging route. The creep deformation and damage of P/M Udimet 720 was analysed to develop a creep predictive model based on physical damage parameters.

Process Development and Mechanical Properties of Alloy U720LI for High Temperature Turbine Disks