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Method for Providing Ferritic-iron-based Alloys.
Dunning-JS; Copeland-MI; Howe-JS
U S Pat 4 087 287 1978 May; :
A strengthened, creep-resistant ferritic alloy is obtained by iron with at least two metallic elements to form an intermediate laves (intermetallic dispersoid) phase Fe2x, where X is an alloying element. The total content of added elements is no more than 10 pct, plus any excess for reaction with the interstitial elements in the iron. The typical alloys contained 1-5 ta and/or Nb, with 1-8 pct mo and/or w. Further additions of cr and/or al may be made for solid-solution matrix strengthening and improved resistance to corrosion or oxidation. Chem. Abstr. 89:184,032D a strengthened creep-resistant ferritic alloy is produced by alloying the iron with at least two alloying metals of the type that form an intermediate laves phase having the composition fe2x, where X is the alloying metal. One of the alloy metals comprised 1-5 pct ta and/or Nb whereas the other alloying metal comprises 1-8 pct mo and/or w. Thus, a fe-2ta-7.5 pct mo alloy was prepared, solution treated at 1,140 deg c, water quenched, and aged at 650 deg c. The alloy had a tensile strength of 92.6, Yield strength 52.5 Kpsi and elongation 10 pct at 400 deg c, and 40.6 Kpsi, 32.7 Kpsi, and 18 pct at 650 deg c, and 20.5 Kpsi, 20.1 Kpsi, and 19 pct at 800 deg c, respectively.
U.S. Pat. 4,087,287; May 2, 1978; Chem. Abstr. 89:115,459M
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