Method for producing large diameter ingots of nickel base...

C - Chemistry – Metallurgy – 22 – C

Patent

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C22C 19/05 (2006.01) C22B 9/18 (2006.01) C22B 9/20 (2006.01) C22F 1/10 (2006.01) C21D 1/18 (2006.01) C21D 1/26 (2006.01) C21D 1/34 (2006.01)

Patent

CA 2439423

A method of producing a nickel base alloy includes casting the alloy within a casting mold and subsequently annealing and overaging the ingot at least 1200 ~F (649 ~C) for at least 10 hours. The ingot is electroslag remelted at a melt rate of at least 8 Ibs/min. (3.63 kg/min.), and the ESR ingot is then transferred to a heating furnace within 4 hours of complete solidification and is subjected to a novel post-ESR heat treatment. A suitable VAR electrode is provided form The ESR ingot, and the electrode is vacuum arc remelted at a melt rate of 8 to 11 lbs/minute (3.63 to 5.00 kg/minute) to provide a VAR ingot. The method allows premium quality VAR ingots having diameters greater than 30 inches (762 mm) to be prepared from Alloy 718 and other nickel base superalloys subject to significant segregation on casting.

L'invention concerne un procédé de fabrication d'un alliage à base de nickel consistant à couler l'alliage dans un moule et ensuite à recuire et à survieillir le lingot à au moins 1200 ·F (649 ·C) pendant au moins 10 heures. Le lingot est affiné par refusion sous laitier (ESR) à une vitesse de fusion d'au moins 8 Ibs/min. (3.63 kg/min.), et le lingot ESR est ensuite transféré dans un four de réchauffage avant 4 heures de solidification totale et est soumis à un nouveau traitement thermique post-ESR. Une électrode VAR (refonte sous vide) appropriée est obtenue à partir du lingot ESR et l'électrode est refondue sous vide à une vitesse de fusion comprise entre 8 et 11 lbs/minute (3.63 à 5.00 kg/minute), de manière à obtenir un lingot VAR. Le procédé permet d'obtenir des lingots VAR de qualité supérieure présentant des diamètres supérieurs à 30 pouces (762 mm) à préparer à partir de l'alliage 718 et d'autres superalliages à base de nickel soumis à une ségrégation importante au moment de la coulée.

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