Metal treatment – Compositions – Heat treating
Patent
1990-06-25
1991-12-24
Dean, R.
Metal treatment
Compositions
Heat treating
148 115N, 148 127N, 148162, 148404, 148409, C22F 110
Patent
active
050749250
ABSTRACT:
A thermomechanical method for fabricating net shape single crystal airfoils is disclosed. A cast single crystal superalloy workpiece is solution heat treated to provide a homogeneous gamma prime distrubition. The single crystal sheet stock is then warm worked, generally forged or rolled, at a working temperature of gamma prime solvus minus about 50.degree.-300.degree. F. with a maximum six percent deformation per pass. Following the first warm working, the single crystal sheet stock is cyclic annealed in a temperature range of gamma prime solvus minus about 50.degree.-125.degree. F. to prevent recrystallization of the single crystal sheet stock. The cyclic annealing is preferably cycled three to ten times between the low and high ends of the temperature range at a rate of change of temperature between about 1.degree. F. per minute to about 10.degree. F. per minute. The single crystal sheet stock is then again warm worked at the described temperatures and deformations, followed by another cyclic annealing step to prevent recrystallization. The alternating working and cyclic annealing steps are repeated until the sheet stock has achieved a desired final net shape of the airfoil.
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Gostic William J.
Miller John A.
Dean R.
Koehler Robert R.
Singer Donald J.
Singer Fredric L.
The United States of America as represented by the Secretary of
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