Iron aluminide alloys with improved properties for high temperat

Alloys or metallic compositions – Ferrous – Four percent or more aluminum containing

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420 81, 420 77, C22C 3806

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049619039

ABSTRACT:
An improved iron aluminide alloy of the DO.sub.3 type that has increased room temperature ductility and improved high elevated temperature strength. The alloy system further is resistant to corrosive attack in the environments of advanced energy corrosion systems such as those using fossil fuels. The resultant alloy is relatively inexpensive as contrasted to nickel based and high nickel steels currently utilized for structural components. The alloy system consists essentially of 26-30 at. % aluminum, 0.5-10 at. % chromium, 0.02-0.3 at. % boron plus carbon, up to 2 at. % molybdenum, up to 1 at. % niobium, up to 0.5 at. % zirconium, up to 0.1 at. % yttrium, up to 0.5 at. % vanadium and the balance iron.

REFERENCES:
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patent: 3026197 (1962-03-01), Scramm
M. G. Mendiratta, et al, "DO.sub.3 -Domain Structures in Fe.sub.3 Al-X Alloys" in High-Temperature Ordered Intermetallic Alloys, MRS Symposia Proc., v. 39, pp. 155-162 (Nov. 26-28, 1984).
M. G. Mendiratta, et al, Tensile Flow & Fracture Behavior of DO.sub.3 Fe-25 At. Pct. & Fe-31 At. Pct. Al Alloys Metallurgical Transactions A, vol. 18A, Feb. 1987, 283-291.
C. G. McKamey et al, Effect of Chromium on Room Temperature Ductility & Fracture Mode in Fe.sub.3 Al, Scripta Metallurgica, vol. 22, pp. 1679-1681 (1988).
C. G. McKamey, et al, Development of Iron Aluminides for Coal Conversion Systems, ORNL Report TM-10793, Jul. 1988.
C. G. McKamey, et al, Evaluation of Mechanical & Metallurgical Properties of Fe.sub.3 Al-Based Aluminides, ORNL Report TM-10125, Sep. 1986.
C. G. McKamey, et al, The Effect of Molybdenum Addition on Properties of Iron Aluminides, to be published in Metallurgical Transactions (accepted-pub. date unknown).

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