Directionally solidified eutectic .gamma.+.beta. nickel-base superalloys
AssigneeGeneral Electric Company
InventorMelvin R. Jackson
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Abstract
A directionally solidified multivariant eutectic .gamma.+.beta. nickel-base superalloy casting having improved high temperature strength and oxidation resistance properties is provided comprising a two phase eutectic structure containing, on a weight percent basis, 7.0-12.0 aluminum, 5.0-40.0 chromium, 3.0-35.0 iron and the balance being nickel. Embedded within the .gamma. phase nickel-base matrix are aligned eutectic .beta. phase (primarily (Ni,Fe,Al) )reinforcing lamellae.
Claims11
An article of manufacture having improved high temperature strength and oxidation resistance properties comprising a directionally solidified multivariant eutectic .gamma.+.beta. nickel-base superalloy casting containing a two phase eutectic structure consisting of a .gamma. phase matrix of a face-centered-cubic solid solution crystal structure based on nickel having embedded in the .gamma. phase an aligned reinforcing lamellar .beta. phase consisting primarily of a nickel-iron-aluminum (Ni,Fe,Al) composition which is a body-centered-cubic (CsCl) ordered intermetallic based on (Ni,Fe)Al.
Dependencies are inferred from the claim text.