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Cryogenic properties of a new tough-strong iron alloyA program was undertaken to develop an iron-base alloy having a fracture toughness of 220 MPa-sq root meters with a corresponding yield stress of 1.4 GPa (200 ksi) at -196 C. An Fe-12Ni alloy was selected as the base alloy. Factors considered include reactive metal additions, effects of interstitial impurities, strengthening mechanisms, and weldability. The goals of this program were met in an Fe-12Ni-0.5Al alloy strengthened by thermomechanical processing or by precipitate strengthening with 2 percent Cu. The alloy is weldable with the weld metal and heat affected zone in the post-weld annealed condition having toughness equivalent to the base alloy.
Document ID
19780031916
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Stephens, J. R.
(NASA Lewis Research Center Cleveland, OH, United States)
Witzke, W. R.
(NASA Lewis Research Center Cleveland, Ohio, United States)
Date Acquired
August 9, 2013
Publication Date
August 1, 1977
Subject Category
Metallic Materials
Meeting Information
Meeting: International Cryogenic Materials Conference
Location: Boulder, CO
Start Date: August 2, 1977
End Date: August 5, 1977
Sponsors: National Bureau of Standards
Accession Number
78A15825
Distribution Limits
Public
Copyright
Other

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