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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 9217187 B1

PDFFull Text
Date of Patent:
Dec. 22, 2015

Filed:

Jul. 20, 2012

Magnetic field annealing for improved creep resistance

Applicants:

Michael P. Brady, Oak Ridge, TN (US);

Gail M. Ludtka, Oak Ridge, TN (US);

Gerard M. Ludtka, Oak Ridge, TN (US);

Govindarajan Muralidharan, Knoxville, TN (US);

Don M. Nicholson, Oak Ridge, TN (US);

Orlando Rios, Knoxville, TN (US);

Yukinori Yamamoto, Knoxville, TN (US);

Inventors:

Michael P. Brady, Oak Ridge, TN (US);

Gail M. Ludtka, Oak Ridge, TN (US);

Gerard M. Ludtka, Oak Ridge, TN (US);

Govindarajan Muralidharan, Knoxville, TN (US);

Don M. Nicholson, Oak Ridge, TN (US);

Orlando Rios, Knoxville, TN (US);

Yukinori Yamamoto, Knoxville, TN (US);

Assignee:

UT-BATTELLE, LLC, Oak Ridge, TN (US);

Attorney:

Novak Druce Connolly Bove + Quigg LLP

Primary Examiner:

Keith Walker

Assistant Examiner:

Stephani Gulbrandsen

Int. Cl.
CPC ...
C21D 1/18 (2006.01); C22C 38/00 (2006.01); C22C 19/03 (2006.01); C22F 1/10 (2006.01); C21D 6/02 (2006.01); C21D 1/26 (2006.01); C22C 30/00 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C22C 1/02 (2006.01);
U.S. Cl.
CPC ...
C21D 6/02 (2013.01); C21D 1/26 (2013.01); C22C 1/02 (2013.01); C22C 19/03 (2013.01); C22C 30/00 (2013.01); C22C 38/00 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C21D 1/18 (2013.01); C21D 2201/03 (2013.01); C21D 2211/004 (2013.01); C21D 2281/00 (2013.01); C22F 1/10 (2013.01);
Abstract

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 1000-1500° C. for 1-48 h in the presence of a magnetic field of at least 5 Tesla to enhance supersaturation of the MXconstituents in the annealed precursor. This forms nanoscale MXprecipitates for improved creep resistance when the alloy is used at service temperatures of 500-1000° C. Alloys having improved creep resistance are also disclosed.

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