| 摘要 |
A method for preparing a part in nickel-based superalloy is disclosed. The method comprises the following steps: elaborating a nickel-based superalloy with a composition capable of providing hardening by double precipitation of a gamma′ phase and of a gamma″ or delta phase; atomizing a melt of the superalloy in order to obtain a powder; sifting the powder; introducing the powder into a container; closing and applying vacuum to the container; densifiying the powder and the container in order to obtain an ingot or a billet; hot forming said ingot or said billet; wherein before the densification step, the powder and the container are heated for at least 4 hrs, at a temperature both above 1,140° C. and at least 10° C. less than the solidus temperature of the superalloy, and at a pressure causing densification of less than or equal to 15% of the powder volume.
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