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Alumina forming iron base superalloy

United States Patent

8,815,146
August 26, 2014
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
An austenitic stainless steel alloy, consists essentially of, in weight percent 2.5 to 4 Al; 25 to 35 Ni; 12 to 19 Cr; at least 1, up to 4 total of at least one element selected from the group consisting of Nb and Ta; 0.5 to 3 Ti; less than 0.5 V; 0.1 to 1 of at least on element selected from the group consisting of Zr and Hf; 0.03 to 0.2 C; 0.005 to 0.1 B; and base Fe. The weight percent Fe is greater than the weight percent Ni. The alloy forms an external continuous scale including alumina, and contains coherent precipitates of .gamma.'-Ni.sub.3Al, and a stable essentially single phase FCC austenitic matrix microstructure. The austenitic matrix is essentially delta-ferrite-free and essentially BCC-phase-free.
Yamamoto; Yukinori (Knoxville, TN), Muralidharan; Govindarajan (Knoxville, TN), Brady; Michael P. (Oak Ridge, TN)
UT-Battelle, LLC (Oak Ridge, TN)
13/ 440,639
20130266477
April 5, 2012
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH This invention was made with government support under contract No. DE-AC05-00OR22725 awarded by the U.S. Department of Energy. The government has certain rights in this invention.