NICKEL BASE SUPERALLOY COMPOSITIONS BEING SUBSTANTIALLY FREE OF RHENIUM AND SUPERALLOY ARTICLES

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A nickel base superalloy composition substantially free of rhenium includes, in percentages by weight : about 5-8 Cr; about 7-8 Co; about 1.3-2.2 Mo; about 4.75-6.75 W; about 6.0-7.0 Ta; if present, up to about 0.5 Ti; about 6.0-6.4 Al; about 0.15-0.6 Hf; if present, from about 0.03-0.06 C; if present, up to about 0.004 B; if present, one or more rare earths selected from Y, La, and Ce up to about 0.03 total, the balance in-cludingnickel and incidental impurities. The superalloy composition is able to provide sustained-peak low cy-cle fatigue and/or oxidation resistance properties com-parable to second generation superalloy compositions including at least about 3 wt% rhenium. Superalloy ar-ticles incorporating the compositions include nozzles, shrouds, and splash plates for gas turbine engines.