Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1991-03-19
1993-01-19
Dean, R.
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
148676, C22F 110
Patent
active
051804514
ABSTRACT:
Process for the production of longitudinally-directed coarse-grained columnar crystals in an oxide-dispersion-hardened nickel-based superalloy which is difficult to recrystallize, starting from a warm-kneaded fine-grained structural status, by heating to a preheating temperature T.sub.pre, which is below the minimum recrystallization temperature T.sub.rec min necessary for the material and is at least at the solution annealing temperature of the carbides in the .gamma.-matrix, keeping at T.sub.pre for 5 min to 6 h, for the purpose of isothermal annealing, and immediately heating to recrystallization temperature T.sub.rec at 10.degree. to 40.degree. C./min without prior cooling, and cooling to room temperature.
REFERENCES:
patent: 3746581 (1973-07-01), Cairns et al.
patent: 4795507 (1989-01-01), Nazmy
patent: 5006163 (1991-04-01), Benn et al.
patent: 5067986 (1991-11-01), Fried et al.
"The Effect of Heating Rate on the Recrystallization Behavior of High.gamma., ODS Superalloys", Jongenburger, et al., 14 pp., ODS Meeting Proceedings from Oct. 15, 1989.
Asea Brown Boveri Ltd.
Dean R.
Phipps Margery S.
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