Structure and elevated temperature properties of carbon-free ferritic alloys strengthened by a laves phase |
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Authors: | M Dilip Bhandarkar M Shanthidas Bhat Victor F Zackay and Earl R Parker |
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Affiliation: | (1) Materials Division, Materials Research Branch, NASA Langley Research Center, 23665 Hampton, VA;(2) Lawrence Berkeley Laboratory, University of California, 94720 Berkeley, CA |
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Abstract: | A 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 α→γ 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.
M. Dilip Bhandarkar, formerly with Lawrence Berkeley Laboratory. |
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