Method for producing enhanced fatigue and tensile properties in integrally bladed rotor forgings
A method for producing an enhanced property integrally bladed rotor includes solution heat treating a stub-containing rotor hub forging; water quenching the solution heat treated stub-containing rotor hub; aging the water quenched stub-containing rotor hub forging; linear friction welding airfoils onto each of a multiple of stubs of the stub-containing rotor hub forging; and concurrently stress relieving the linear friction welds of each of the multiple of stubs within a predefined area while ensuring that a hub inner diameter does not exceed a predetermined temperature.
1. A method for producing a rotor hub, the method comprising:
solution heat treating a stub-containing rotor hub forging;
water quenching the solution heat treated stub-containing rotor hub forging;
aging the water quenched stub-containing rotor hub forging;
linear friction welding airfoils onto each of a multiple of stubs of the stub-containing rotor hub forging;
concurrently stress relieving the linear friction welds of each of the multiple of stubs at least within a predefined area while ensuring that a hub inner diameter does not exceed a predetermined temperature; and
warm-working the multiple of stubs subsequent to the solution heat treating and prior to aging the water quenched stub-containing rotor hub forging.
2. The method as recited in claim 1 , wherein the predetermined temperature is 1000 degrees F.
3. The method as recited in claim 2 , wherein concurrently stress relieving the linear friction welds of each of the multiple of stubs comprises maintaining the predefined area at 1100 degrees F. for a predetermined time period.
4. The method as recited in claim 3 , wherein the predetermined time period is 6 hours.
5. The method as recited in claim 1 , further comprising warm-working the multiple of stubs prior to the solution heat treating.
6. The method as recited in claim 1 , further comprising machining the stub-containing rotor hub forging to a sonic shape prior to the solution heat treating.
7. The method as recited in claim 1 , wherein stress relieving the linear friction welds of each of the multiple of stubs.
8. The method as recited in claim 1 , wherein stress relieving the linear friction welds of each of the multiple of stubs only within a predefined area.
9. An integrally bladed rotor, comprising:
a stub-containing rotor hub forging; and
an airfoil linear friction welded on each of a multiple of stubs of the stub-containing rotor hub forging, each of the airfoils and each of the multiple of stubs stress relieved within a predefined area, the predefined area is displaced from an inner diameter of a hub of the stub-containing rotor hub forging, the multiple of stubs warm-worked subsequent to a solution heat treating and prior to an aging of a water quenched stub-containing rotor hub forging.
10. The rotor hub as recited in claim 9 , wherein the predefined area is defined span wise along each of the airfoils and each of the multiple of stubs.
11. The rotor hub as recited in claim 10 , wherein the predefined area is greater than 1 inch from an inner diameter of a hub of the stub-containing rotor hub forging.
12. The rotor hub as recited in claim 9 , wherein the predefined area is greater than 0.375 inches and less than 3 inches from an inner diameter of a hub of the stub-containing rotor hub forging.
13. The rotor hub as recited in claim 9 , wherein the predefined area is greater than 0.5 inches and less than 2 inches from an inner diameter of a hub of the stub-containing rotor hub forging.
14. The rotor hub as recited in claim 8 , wherein the stub-containing rotor hub forging is a titanium forging.
15. The rotor hub as recited in claim 8 , wherein each of the airfoils are hollow.
16. The rotor hub as recited in claim 8 , wherein each of the airfoils are solid.