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A new single crystal N&Fe based superalloy, designated THYMONEL 8, was developed in order to satisfy the specific requirements of rocket engine turbopump airfoils. The principal objective was to obtain an alloy with a high fatigue resistance together with a low susceptibility to hydrogen environment enbrittlement (HEE). The effects of the distribution of strengthening y ’ precipitates on the tensile properties of the alloy were investigated. The best balance between tensile strength and ductility was obtained with a duplex dispersion of y ’ particles. Smooth and notched tensile tests performed at 300 K showed a susceptibility to HEE significantly lower than that of single crystal superalloys designed for aircraft applications. THYMONEL 8 exhibited improved low cycle fatigue and stress-rupture properties compared to forged Superwaspaloy used by S.E.P. for turbopump rotors. In addition, THYMONEL 8 exhibited higher thermal conductivity and lower Young’s modulus than the single crystal alloys for aircraft turbines, which is beneficial for the thermo-mechanical strength.

Development of a Hydrogen Resistant Superalloy for Single Crystal Blade Application in Rocket Engine Turbopumps