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High Strength Alloys for High Temperature Service in Liquid-Salt Cooled Energy Systems

United States Patent Application

View the Complete Application at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
An essentially cobalt-free alloy consists essentially of, in terms of weight percent: 6.3 to 7.2 Cr, 0.5 to 2 Al, 0 to 5 Fe, 0.7 to 0.8 Mn, 9 to 12.5 Mo, 0 to 6 Ta, 0.75 to 3.5 Ti, 0.01 to 0.25 Nb, 0.2 to 0.6 W, 0.02 to 0.04 C, 0 to 0.001 B, 0.0001 to 0.002 N, balance Ni. The alloy is characterized by a .gamma.' microstructural component in the range of 3 to 17.6 weight percent of the total composition. The alloy is further characterized by, at C., a yield strength of at least 60 Ksi, a tensile strength of at least 70 Ksi, a creep rupture life at 12 Ksi of at least 700 hours, and a corrosion rate, expressed in weight loss [g/(cm.sup.2sec)]10.sup.-11 during a 1000 hour immersion in liquid FLiNaK at C., in the range of 5.5 to 17.
Holcomb, David E. (Oak Ridge, TN), Muralidharan, Govindarajan (Knoxville, TN), Wilson, Dane F. (Oak Ridge, TN)
13/ 834,985
March 15, 2013
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH [0001] The United States Government has rights in this invention pursuant to contract no. DE-ACO5-00OR22725 between the United States Department of Energy and UT-Battelle, LLC.