Metal treatment – Stock – Age or precipitation hardened or strengthened
Patent
1997-05-15
1999-02-09
Sheehan, John
Metal treatment
Stock
Age or precipitation hardened or strengthened
419 20, 75232, 75235, C22C 1400
Patent
active
058688765
ABSTRACT:
A wet-doping process for producing an oxide-dispersion strengthened (ODS), creep-resistant molybdenum alloy is disclosed. The alloy is made by adding nitrate or acetate salts of lanthanum, cerium, thorium, or yttrium to molybdenum oxide to produce a slurry, heating the slurry in a hydrogen atmosphere to produce a powder, mixing and cold isostatically pressing the powder, sintering in a hydrogen atmosphere, and thermomechanically processing (swaging, extruding, cold drawing) the product. The ODS molybdenum alloy produced by the process contains 2-4% by volume (.about.1-4% by weight) of an oxide of lanthanum, cerium, thorium, or yttrium. The alloy has high strength and improved creep-resistance at temperatures greater than 0.55T.sub.m of molybdenum.
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R. Bianco and R.W. Buckman, Jr., "Evaluation of Oxide Dispersion Strengthened (ODS) Molybdenum Alloys", Symposium of High Temperature Materials, Am. Soc. of Materials, General Electric R&D Center, Schenectady, N.Y., May 19, 1995.
Bianco Robert
Buckman, Jr. R. William
Geller Clint B.
Caress Virginia B.
Gottlieb Paul A.
Moser William R.
Sheehan John
The United States of America as represented by the United States
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