Metallurgical process with nickel-chromium superalloy
AssigneeUnited Technologies Corporation
InventorGopal Das
Life of this patent
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Abstract
A method of metallurgical processing includes, providing a workpiece that has been formed by additive manufacturing of a nickel-chromium based superalloy. The workpiece has an internal porosity and a microstructure with a columnar grain structure and delta phase. The workpiece is then hot isostatically pressed to reduce the internal porosity and to at least partially retain the columnar grain structure and the delta phase. The workpiece is then heat treated to at least partially retain the columnar grain structure and the delta phase.
Claims16
A method of metallurgical processing, the method comprising:
- providing a workpiece that has been formed by additive manufacturing of a nickel-chromium based superalloy, the workpiece having an internal porosity and a microstructure with a columnar grain structure and delta phase;
- hot isostatically pressing the workpiece to reduce the internal porosity and to at least partially retain the columnar grain structure and the delta phase;
- and
- heat treating the workpiece after the hot isostatic pressing to at least partially retain the columnar grain structure and the delta phase.
A method of metallurgical processing, the method comprising:
- forming a workpiece by selectively consolidating a nickel-chromium based superalloy powder under a vacuum environment, layer-by-layer, using an electron beam, the workpiece having an internal porosity and a microstructure with a columnar grain structure and delta phase;
- hot isostatically pressing the workpiece held under a temperature condition of approximately 1850° F. to approximately 1900° F. and a pressure condition of approximately 15 ksi to approximately 25 ksi;
- after the hot isostatic pressing, solution heat treating the workpiece held under a solution temperature condition of approximately 1750° F. to approximately 1850° F.;
- and
- after the solution heat treating, aging the workpiece held under one or more aging temperature conditions up to approximately 1400° F., and after the aging the workpiece having a columnar grain structure, intragranular delta phase in the columnar grain structure, and delta phase at grain boundaries in the columnar grain structure.
Dependencies are inferred from the claim text.