Low rhenium nickel base superalloy compositions and superalloy articles

摘要

Low rhenium nickel base superalloy compositions and articles formed from the superalloy composition are provided. The nickel base superalloy composition includes in percentages by weight: about 5-8 Cr; about 6.5-9 Co; about 1.3-2.5 Mo; about 4.8-6.8 W; about 6.0-7.0 Ta; if present, up to about 0.5 Ti; about 6.0-6.4 Al; about 1-2.3 Re; if present, up to about 0.6 Hf; if present, up to 1.5 C; if present, up to about 0.015 B; the balance being nickel and incidental impurities. Exemplary compositions are characterized by an Re ratio defined as the weight % of Re relative to the total of the weight % of W and the wt % of Mo, of less than about 0.3. Exemplary articles include airfoils for gas turbine engine blades or vanes, nozzles, shrouds, and splash plates.

主权项

1. A nickel base superalloy composition consisting of, in percentages by weight:
5-8 Cr; 6.5-9 Co; 1.5-2.0 Mo; 6.0-6.5 W; 6.0-7.0 Ta; 6.0-6.4 Al; 1 to 1.5 Re; 0.6 to 0.7 Hf; 0.03 to 1.5 C; 0.004 to 0.015 B; if present, up to 0.03 total of a rare earth selected from Y, La, and Ce, and mixtures thereof; the balance being nickel and incidental impurities; wherein the superalloy composition exhibits creep rupture strength properties of at least 275 hours at a temperature of about 1600° F. (871° C.) and a cyclic load of about 70 ksi (483 MPa); wherein the superalloy composition exhibits creep rupture strength properties of at least 240 hours at a temperature of about 2100° F. (1149° C.) and a cyclic load of about 10 ksi (69 MPa); wherein the superalloy composition exhibits sustained-peak low cycle fatigue (SPLCF) properties of at least 6200 cycles at a temperature of about 2000° F. (1093° C.) and a cyclic load of about 22 ksi (152 MPa); wherein the superalloy composition exhibits sustained-peak low cycle fatigue (SPLCF) properties of at least 2700 cycles at a temperature of about 2000° F. (1093° C.) and a cyclic load of about 30 ksi (207 MPa); wherein an Re ratio defined as the weight % of Re relative to the total of the weight % of W and the wt % of Mo, is less than 0.27.