C - Chemistry – Metallurgy – 22 – F
Patent
C - Chemistry, Metallurgy
22
F
C22F 1/10 (2006.01) C22C 19/03 (2006.01) C22C 19/05 (2006.01)
Patent
CA 2751681
The invention relates to a method for producing a blank for a piece made from a superalloy based on Ni, wherein an alloy is produced and thermal treatments are carried out, characterised in that: said superalloy contains at least 2.5% of the total as Nb and Ta, a thermal treatment is carried out in a number of steps, a first step between 850 and 1,0000C for at least 20 minutes to precipitate the phase d on the grain joints, a second step at a temperature above that of the first step, permitting a partial dissolution of the phase d obtained in the first step, an aging treatment comprising a third step and optionally one or more supplementary steps at a temperature mower than that of the first step and which permit a precipitation of the hardening phases ?' and ?". The invention further relates to a corresponding piece.
Procédé de fabrication d'une ébauche de pièce en superalliage à base de Ni, selon lequel on élabore un alliage, et on réalise des traitements thermiques, caractérisé en ce que : ledit superalliage contient au moins 2,5% au total de Nb et de Ta; on effectue un traitement thermique, comportant une pluralité de paliers : un premier palier entre 850 et 10000C pendant au moins 20 minutes pour précipiter de la phase .delta. aux joints de grains; un deuxième palier à une température supérieure à celle du premier palier et permettant de réaliser une dissolution partielle de la phase .delta. obtenue lors du premier palier; un traitement de vieillissement comportant un troisième palier et éventuellement un ou des paliers supplémentaires, à une température inférieure à celle du premier palier et permettant de faire précipiter les phases durcissantes .gamma.' et .gamma.". Pièce ainsi obtenue.
Aubert & Duval
Smart & Biggar
Snecma
Turbomeca
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