Superalloy component braze repair with isostatic solution treatment
A method of braze repair for a superalloy material component. Following a brazing operation on the superalloy material, the component is subjected to an isostatic solution treatment, followed by a rapid cool down to ambient temperature under pressure The conditions of the isostatic solution treatment combined with the cool down at pressure function to both reduce porosity in the component and to solution treat the superalloy material, thereby optimizing superalloy properties without reintroducing porosity in the braze.
1. A method of repairing a gas turbine blade comprising:
applying a boron free braze material to a superalloy component at a brazing temperature of 1,100-1,250° C. in vacuum;
performing a solution heat treatment and a hot isostatic pressing process simultaneously on the component at below the brazing temperature for 2-4 hours at a pressure of 10-25 ksi;
fast cooling the component at a minimum of 25° C./min to ambient while maintaining the pressure of 10-25 ksi; and
releasing the pressure to ambient.
2. The method of claim 1 , further comprising applying the braze material consisting essentially of 15-25% Cr; 15-25% Ti; balance Ni, in weight percent.
3. The method of claim 1 , further comprising applying the braze material consisting essentially of 15-25% Cr; 15-25% Zr; balance Ni, in weight percent.
4. The method of claim 1 , further comprising applying the braze material consisting essentially of 15-25% Cr; 15-25% Hf; balance Ni, in weight percent.
5. The method of claim 1 , further comprising applying the braze material consisting essentially of 3.5-25% Cr; 17-37% (Ti+Zr+Hf); balance Ni, in weight percent.
6. The method of claim 1 , further comprising:
primary age treating the component at 1,080° C. for 2 hours, then fast cooling the component to ambient at 30° C./min; and
secondary age treating the component at 980° C. for 20 hours, then cooling to ambient.
7. In a method of applying braze material to a superalloy material, an improvement comprising:
performing a solution heat treatment and a hot isostatic pressing process simultaneously at a pressure of 10-25 ksi; then
rapidly cooling at a minimum of 25° C./min to ambient temperature while maintaining the pressure of 10-25 ksi; and
returning the pressure to ambient pressure after returning to ambient temperature.
8. In the method of claim 7 , the braze material comprising 15-25% Cr; 15-25% Ti; balance Ni, in weight percent.
9. In the method of claim 7 , the braze material comprising 15-25% Cr; 15-25% Zr; balance Ni, in weight percent.
10. In the method of claim 7 , the braze material comprising 15-25% Cr; 15-25% Hf; balance Ni, in weight percent.
11. In the method of claim 7 , the braze material comprising 3.5-25% Cr; 17-37% (Ti+Zr+Hf); balance Ni, in weight percent.