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Magnetic field annealing for improved creep resistance

United States Patent

December 22, 2015
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
The method provides heat-resistant chromia- or alumina-forming Fe-, Fe(Ni), Ni(Fe), or Ni-based alloys having improved creep resistance. A precursor is provided containing preselected constituents of a chromia- or alumina-forming Fe-, Fe(Ni), Ni(Fe), or Ni-based alloy, at least one of the constituents for forming a nanoscale precipitate MaXb where M is Cr, Nb, Ti, V, Zr, or Hf, individually and in combination, and X is C, N, O, B, individually and in combination, a=1 to 23 and b=1 to 6. The precursor is annealed at a temperature of C. for 1-48 h in the presence of a magnetic field of at least 5 Tesla to enhance supersaturation of the M.sub.aX.sub.b constituents in the annealed precursor. This forms nanoscale M.sub.aX.sub.b precipitates for improved creep resistance when the alloy is used at service temperatures of C. Alloys having improved creep resistance are also disclosed.
Brady; Michael P. (Oak Ridge, TN), Ludtka; Gail M. (Oak Ridge, TN), Ludtka; Gerard M. (Oak Ridge, TN), Muralidharan; Govindarajan (Knoxville, TN), Nicholson; Don M. (Oak Ridge, TN), Rios; Orlando (Knoxville, TN), Yamamoto; Yukinori (Knoxville, TN)
13/ 553,940
July 20, 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.