Patent ID: 11866809
Assignee: UT-BATTELLE, LLC
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 0:
1. An austenitic Ni-base cast alloy, consisting essentially of, in weight percent:
2.5 to 4.75 Al;
21 to 26 Cr;
20 to 40 Fe;
0.75 to 2.5 total of at least one element selected from
the group consisting of Nb and Ta;
0 to 0.25 Ti;
0.09 to 1.5 Si;
0 to 0.5 V;
0 to 2 Mn;
0 to 3 Cu;
0 to 2 of at least one element selected from the group consisting of Mo and W;
0 to 1 of at least one element selected from the group consisting of Zr and Hf;
0 to 0.15 Y;
0.3 to 0.55 C;
0.005 to 0.1 B;
0 to 0.05 P;
0.002 to less than 0.06 N and
balance Ni (30 to 46 Ni),
wherein the weight percent Ni is greater than the weight percent Fe, wherein the ratio Ni/(Fe+2*C) is between 1.02 and 1.067, wherein said alloy forms an external continuous scale comprising alumina, and has a stable phase FCC austenitic matrix microstructure, said austenitic matrix being essentially delta-ferrite-free and essentially BCC-phase free, consisting of one or more carbide strengthening phases, and exhibits a creep rupture lifetime of at least 200 h at 900° C. and 50 MPa.