NICKEL BASE GAMMA PRIME STRENGTHENED SUPERALLOY

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A nickel base gamma prime strengthened superalloy with a unique blend of high hot corrosion resistance, high oxidation resistance, high coating compatibility, good weldability, high phase stability and at least moderate creep resistance is disclosed. The composition comprises : Up to 20 wt% Co, between 17 and 21 wt% Cr, between 2 and 5 wt% of Mo+W+Re, at most 2 wt% Mo, between 4 and 4.7 wt% Al, between 3 and 7 wt% Ta, between 0.01 and 0.3 wt% of C+Zr+B, between 0.05 and 1 wt% Hf, between 0.05 and 1 wt% Si, and between 0.01 and 0.2 wt% of the sum of rare earths such as Sc, Y, the actinides and the lanthanides. The composition is intended for use as base alloy for moderately stressed hot components, especially in gas turbines, and as filler alloy for cladding and weld repair in moderately stressed parts of hot components, especially in gas turbines.