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Structure and elevated temperature properties of carbon-free ferritic alloys strengthened by a Laves phaseA Laves phase, Fe2Ta, was utilized to obtain good elevated temperature properties in a carbon-free iron alloy containing 1 at. pct Ta and 7 at. pct Cr. Room temperature embrittlement resulting from the precipitation of the Laves phase at grain boundaries was overcome by spheroidizing the precipitate. This was accomplished by thermally cycling the alloys through the alpha to gamma transformation. The short-time yield strength of the alloys decreased very slowly with increase in test temperature up to 600 C, but above this temperature, the strength decreased rapidly. Results of constant load creep and stress rupture tests conducted at several temperatures and stresses indicated that the rupture and creep strengths of spheroidized 1 Ta-7 Cr alloy were higher than those of several commercial steels containing chromium and/or molybdenum carbides but lower than those of steels containing substantial amounts of tungsten and vanadium. When molybdenum was added to the base Fe-Ta-Cr alloy, the rupture and creep strengths were considerably increased.
Document ID
19750051415
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Bhandarkar, M. D.
(NASA Langley Research Center Materials Div., Hampton, Va., United States)
Zackay, V. F.
Parker, E. R.
(California, University Berkeley, Calif., United States)
Bhat, M. S.
Date Acquired
August 8, 2013
Publication Date
June 1, 1975
Publication Information
Publication: Metallurgical Transactions A - Physical Metallurgy and Materials Science
Volume: 6A
Subject Category
Metallic Materials
Accession Number
75A35487
Distribution Limits
Public
Copyright
Other

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