	US 12,186,809 B2
	High temperature alloys
Rishi R. Pillai, Knoxville, TN (US); Soumya Nag, Farragut, TN (US); and Thomas Feldhausen, Knoxville, TN (US)
Assigned to UT-BATTELLE, LLC, Oak Ridge, TN (US)
Filed by UT-Battelle, LLC, Oak Ridge, TN (US)
Filed on Jan. 5, 2024, as Appl. No. 18/405,157.
Claims priority of provisional application 63/437,229, filed on Jan. 5, 2023.
Prior Publication US 2024/0227006 A1, Jul. 11, 2024
Int. Cl. B22F 10/28 (2021.01); B22F 7/02 (2006.01); B22F 10/00 (2021.01); B22F 10/25 (2021.01); B32B 5/14 (2006.01); B32B 15/01 (2006.01); B32B 15/04 (2006.01); B33Y 10/00 (2015.01); B33Y 70/00 (2020.01); B33Y 80/00 (2015.01); C22C 1/04 (2023.01); C22C 19/05 (2006.01); C22C 30/00 (2006.01); C22C 30/02 (2006.01); C22C 38/08 (2006.01); C22C 38/10 (2006.01); C22C 38/40 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C22C 38/52 (2006.01); C22C 38/58 (2006.01)

CPC B22F 7/02 (2013.01) [B22F 10/25 (2021.01); B22F 10/28 (2021.01); B32B 5/145 (2013.01); B32B 15/01 (2013.01); B32B 15/015 (2013.01); B32B 15/04 (2013.01); B32B 15/043 (2013.01); B33Y 10/00 (2014.12); B33Y 70/00 (2014.12); B33Y 80/00 (2014.12); C22C 1/0433 (2013.01); C22C 19/05 (2013.01); C22C 19/051 (2013.01); C22C 19/053 (2013.01); C22C 19/055 (2013.01); C22C 19/056 (2013.01); C22C 19/057 (2013.01); C22C 19/058 (2013.01); C22C 30/00 (2013.01); C22C 30/02 (2013.01); C22C 38/08 (2013.01); C22C 38/10 (2013.01); C22C 38/105 (2013.01); C22C 38/40 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/52 (2013.01); C22C 38/58 (2013.01); B22F 2998/10 (2013.01); B22F 2999/00 (2013.01); Y10T 428/12458 (2015.01); Y10T 428/12931 (2015.01); Y10T 428/12937 (2015.01); Y10T 428/12944 (2015.01); Y10T 428/12965 (2015.01); Y10T 428/12972 (2015.01); Y10T 428/12979 (2015.01); Y10T 428/12993 (2015.01); Y10T 428/2495 (2015.01); Y10T 428/24967 (2015.01)]

11 Claims

1. A wall construction for separating a low oxygen content corrosive environment from a high oxygen content oxidizing environment, comprising:

the wall having a wall thickness and a first surface segment for contacting the low oxygen content corrosive environment, and a second surface segment for contacting the high oxygen content oxidizing environment;

the wall comprising wall alloy having a total wall alloy composition comprising, in weight percent: 0 to 5 Al; 5 to 30 Cr; 0 to 20 Co; 0 to 70 Fe; 0 to 2 Nb; 0 to 2 Ta; 0 to 3 Ti; 0 to 1 Si; 0 to 1 V; 0 to 2 Mn; 0 to 5 Cu; 0 to 30 Mo; 0 to 30 W; 0 to 0.1 P; 0 to 1 Zr; 0 to 1 Hf; 0 to 0.1 Y; 0.05 to 0.5 C; 0 to 0.1 N; and balance Ni;

the alloy being compositionally graded from the first surface segment having a first surface segment alloy composition to the second surface segment having a second surface segment alloy composition;

the first surface segment alloy composition comprising, in weight percent based on the total weight of the alloy at the first surface segment, 5-15 Cr, 0-70 Fe, 0-5 Co, 0-30 Mo, 0-1 Mn, 0-0.5 Si, 0-0.1 C, and balance Ni;

the second surface segment alloy composition comprising, in weight percent based on the total weight of the alloy at the second surface segment, 15-30 Cr, 0-70 Fe, 0-20 Co, 0-30 Mo, 0-3 Ti, 0-5 Al, 0-0.5 C, and balance Ni;

the wall alloy having a stable FCC austenitic matrix microstructure, with strengthening phases comprising gamma prime with a volume fraction of 1 to 30% and carbides with a volume fraction of 0 to 5%, based on the total volume of the alloy;

the wall providing corrosion resistance to the liquid low oxygen content corrosive environment with O content between 0 to 20,000 ppm and to the high oxygen content oxidizing environment with O partial pressure between 10-20 to 1 bar, such that the depth of corrosion attack on each of the first and second surface segments after 10,000 h at 800° C. is no more than 10% of the wall thickness.