Method for preparing a nickel superalloy part, and the part thus obtained
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United States of America Patent
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Nov 18, 2014
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Aug 24, 2009
filing date -
Aug 26, 2008
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Abstract
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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