Metal treatment – Process of modifying or maintaining internal physical... – With casting or solidifying from melt
Patent
1997-08-29
2000-03-07
Willis, Prince
Metal treatment
Process of modifying or maintaining internal physical...
With casting or solidifying from melt
148675, C22F 110
Patent
active
060334983
ABSTRACT:
Castings based on the nickel aluminide intermetallic alloy IC-221M were melted and poured with an addition of enough molybdenum to bring its concentration to 5 weight %. This resulted in a minimization or elimination of the nickel-zirconium eutectic phase in the dies machined and prepared from these castings. The benefit of eliminating or minimizing the nickel zirconium eutectic phase with the addition of measurable amounts of molybdenum (Mo) to the nickel aluminide (Ni.sub.3 Al) alloy is the increase in the useful service life of the tooling made from it; thus providing the advantages of increased productivity, enhanced quality and reduced costs in a manufacturing setting. Heat treatment of the dies machined and prepared from these castings was also undertaken. The heat treatment regimen includes solution treatment at 2100.degree. F. for 24 hours and aging from between 1150.degree. F. and 1300.degree. F. for between 12 to 24 hours. The benefit of heat treating the dies is the increase in the mechanical properties and hence the service life of the tooling made from it.
REFERENCES:
patent: 5059257 (1991-10-01), Wanner et al.
"High Temperature Performance of Nickel Aluminide Castings for Furnace Fixtures and Components", J.E. Orth and V.K. Sikka; pre-publication print from the 1996 Heat Treat Conference & Expo, sponsored by ASM International.
"Evaluation of the Ni.sub.3 Al Base Alloys IC221 and IC218LZr", Samuelsson, P.W. Keefe, Special Metals Corporation, New Hartford, NY, R.W. Furgason, Ladish Comapny, Cudahy, WI, Superalloys, 1992.
Chen Chien-Hua
Maddox, Jr. Guy Monroe
Orth John Edward
Turbeville Elliott Lee
Kamp Ronald C.
Oltmans Andrew L.
United Defense L.P.
Willis Prince
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