Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Metal and nonmetal in final product
Patent
1984-11-01
1986-05-13
Rosenbaum, Mark
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Metal and nonmetal in final product
29DIG31, 1481261, 419 23, 419 28, 419 29, 419 31, 419 32, 419 43, 419 49, 419 50, B22F 100, B22F 900, C22C 104, C22C 1903
Patent
active
045885524
ABSTRACT:
Manufacture of a workpiece from a creep-resistant nickel superalloy which is hardened by means of an oxide dispersion, by a powder-metallurgical process in which the mechanically alloyed powder is subjected to an isothermal or quasi-isothermal hot-rolling operation, in the course of which the powder particles are converted into a flake-shaped form with a pronounced longitudinal axes, and the rolled powder is introduced into a steel container and is compressed by isostatic hot-pressing. The workpiece is afterwards subjected to an annealing treatment which is designed to develop a coarse grain size. A preferred embodiment comprises the introduction of the powder into the mold or container in an oriented manner, in order to obtain a stratified packing of the powder, and an annealing treatment which is designed to develop a coarse grain size and is performed as a zone-annealing treatment.
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Schroder Gunther
Singer Robert
BBC Brown Boveri & Co. Ltd.
Rosenbaum Mark
Wallace Ronald S.
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