Back to results
US 7,740,724 B2Granted
Method for preventing formation of cellular gamma prime in cast nickel superalloys
AssigneeUnited Technologies Corporation
InventorReade R. Clemens
Life of this patent
Estimating the term…
Abstract
A method for preventing the formation of cellular gamma prime in nickel-based superalloys comprises the steps of: casting a nickel-based superalloy into a desired article; subjecting the cast article to hot isostatic pressing at a temperature in excess of 2000° F. at a pressure greater than 15,000 psi to close internal pores in the cast article; and avoiding any formation of the cellular gamma prime in the cast article.
Claims8
A method for preventing the formation of cellular gamma prime in nickel-based superalloys comprising the steps of:
- casting a nickel-based superalloy into a desired article;
- placing said cast article into a chamber;
- subjecting said cast article while in said chamber to hot isostatic pressing at a temperature in excess of 2000° F. at a maximum pressure greater than 15,000 psi to close internal pores in said cast article;
- and
- avoiding any formation of said cellular gamma prime in said cast article, said avoiding step comprising concluding said hot isostatic pressing step by decreasing said maximum pressure while maintaining said temperature for a time period prior to removing said cast article from the chamber.
2 more elements
Dependencies are inferred from the claim text.