Process for manufacturing semi-finished products from sintered r

Details Process for manufacturing semi-finished products from sintered r Process for manufacturing semi-finished products from sintered r

1990-09-01

1992-04-07

Dean, R.

Metal treatment

Compositions

Heat treating

148 115F, 148130, 148133, 148423, C22F 100

Patent

active

051024748

ABSTRACT:
In a process for manufacturing semi-finished products from sintered refractory metal alloys with a stacked microstructure, the sinter feed reshaped by at least 85% is subjected prior to recrystallization annealing to an intermediate annealing for at least 20 minutes at a temperature not less than 700.degree. C. and not greater than that at which no further recrystallization occurs. Following this intermediate annealing, the hot feed is deformed by a further 3% to 30%. The process makes it possible to manufacture semi-finished products with a good stacked microstructure and of substantially greater dimensions, or of the same dimensions and a substantially better stacked microstructure, than can be obtained with known manufacturing processes.

REFERENCES:
patent: 2628926 (1953-02-01), Ramage et al.
patent: 2692216 (1954-10-01), Baker
patent: 3297496 (1967-01-01), Chang et al.
patent: 3377211 (1968-04-01), Schoenfeld
patent: 3676083 (1972-07-01), Cheney et al.
patent: 4647317 (1987-03-01), Rosecrans

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