Process for increasing the room-temperature ductility of a workp

Details Process for increasing the room-temperature ductility of a workp Process for increasing the room-temperature ductility of a workp

1987-12-10

1989-01-03

Stallard, Wayland

Metal treatment

Compositions

Heat treating

148 115P, 148162, B22F 504

Patent

active

047955074

ABSTRACT:
Process for increasing the room-temperature ductility of a workpiece composed of oxide-dispersion-hardened nickel-base superalloy and existing as coarse, longitudinally oriented columnar crystallites by subjecting the previously zone-annealed workpiece to a solution anneal in the temperature range between 1,160.degree. and 1,280.degree. C. under argon atmosphere for 1/2 h to 5 h and then to a purposefully chosen cooling down at a rate of 0.1.degree. C./min to 5.degree. C./min to a temperature of 500.degree. to 700.degree. C. Thereafter the workpiece is cooled down to room temperature in air. Preferred purposefully chosen cooling down rate: approx. 0.5.degree. C./min.

REFERENCES:
patent: 4502896 (1985-03-01), Duerig et al.
patent: 4518442 (1985-05-01), Chin
patent: 4531981 (1985-07-01), Singer

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