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Title: Iron aluminide useful as electrical resistance heating elements

The invention relates generally to aluminum containing iron-base alloys useful as electrical resistance heating elements. The aluminum containing iron-base alloys have improved room temperature ductility, electrical resistivity, cyclic fatigue resistance, high temperature oxidation resistance, low and high temperature strength, and/or resistance to high temperature sagging. The alloy has an entirely ferritic microstructure which is free of austenite and includes, in weight %, over 4% Al, .ltoreq.1% Cr and either .gtoreq.0.05% Zr or ZrO.sub.2 stringers extending perpendicular to an exposed surface of the heating element or .gtoreq.0.1% oxide dispersoid particles. The alloy can contain 14-32% Al, .ltoreq.2% Ti, .ltoreq.2% Mo, .ltoreq.1% Zr, .ltoreq.1% C, .ltoreq.0.1% B, .ltoreq.30% oxide dispersoid and/or electrically insulating or electrically conductive covalent ceramic particles, .ltoreq.1% rare earth metal, .ltoreq.1% oxygen, .ltoreq.3% Cu, balance Fe.
Inventors:
 [1];  [1];  [2];  [3];  [4]
  1. (Oak Ridge, TN)
  2. (Midlothian, VA)
  3. (Richmond, VA)
  4. (Chesterfield, VA)
Issue Date:
OSTI Identifier:
870902
Assignee:
Philip Morris Incorporated (New York, NY) ORNL
Patent Number(s):
US 5620651
Contract Number:
AC05-84OR21400
Research Org:
LOCKHEED MARTIN ENRGY SYST INC
Country of Publication:
United States
Language:
English
Subject:
iron; aluminide; useful; electrical; resistance; heating; elements; relates; aluminum; containing; iron-base; alloys; improved; temperature; ductility; resistivity; cyclic; fatigue; oxidation; strength; sagging; alloy; entirely; ferritic; microstructure; free; austenite; weight; ltoreq; gtoreq; 05; zr; zro; stringers; extending; perpendicular; exposed; surface; element; oxide; dispersoid; particles; contain; 14-32; 30; electrically; insulating; conductive; covalent; ceramic; rare; earth; metal; oxygen; cu; balance; temperature sagging; aluminum containing; oxide dispersoid; base alloy; base alloys; aluminide useful; entirely ferritic; fatigue resistance; ferritic microstructure; containing iron-base; conductive covalent; iron-base alloys; cyclic fatigue; covalent ceramic; temperature strength; heating elements; resistance heating; exposed surface; oxidation resistance; temperature ductility; heating element; ceramic particles; electrically insulating; electrically conductive; rare earth; earth metal; electrical resistance; electrical resistivity; iron aluminide; ceramic particle; temperature oxidation; stringers extending; extending perpendicular; containing iron; alloys useful; dispersoid particles; resistance heat; /420/148/

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