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Title: Magnetic field annealing for improved creep resistance

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.degree. 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 500-1000.degree. C. Alloys having improved creep resistance are also disclosed.

Inventors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1233590
Patent Number(s):
9,217,187
Application Number:
13/553,940
Assignee:
UT-BATTELLE, LLC (Oak Ridge, TN) ORNL
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Patent
Resource Relation:
Patent File Date: 2012 Jul 20
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Brady, Michael P., Ludtka, Gail M., Ludtka, Gerard M., Muralidharan, Govindarajan, Nicholson, Don M., Rios, Orlando, and Yamamoto, Yukinori. Magnetic field annealing for improved creep resistance. United States: N. p., 2015. Web.
Brady, Michael P., Ludtka, Gail M., Ludtka, Gerard M., Muralidharan, Govindarajan, Nicholson, Don M., Rios, Orlando, & Yamamoto, Yukinori. Magnetic field annealing for improved creep resistance. United States.
Brady, Michael P., Ludtka, Gail M., Ludtka, Gerard M., Muralidharan, Govindarajan, Nicholson, Don M., Rios, Orlando, and Yamamoto, Yukinori. Tue . "Magnetic field annealing for improved creep resistance". United States. doi:. https://www.osti.gov/servlets/purl/1233590.
@article{osti_1233590,
title = {Magnetic field annealing for improved creep resistance},
author = {Brady, Michael P. and Ludtka, Gail M. and Ludtka, Gerard M. and Muralidharan, Govindarajan and Nicholson, Don M. and Rios, Orlando and Yamamoto, Yukinori},
abstractNote = {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.degree. 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 500-1000.degree. C. Alloys having improved creep resistance are also disclosed.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Dec 22 00:00:00 EST 2015},
month = {Tue Dec 22 00:00:00 EST 2015}
}

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