Property recovering method for nickel superalloy

Details Property recovering method for nickel superalloy Property recovering method for nickel superalloy

C - Chemistry, Metallurgy

22

F

C22F 1/10 (2006.01) B23P 6/04 (2006.01)

Patent

CA 2498663

A method is disclosed for recovering the properties of single crystal and directionally solidified Nickel based superalloys and articles made thereof, after use in a high temperature environment. The method comprises the steps of a stress relief treatment, a .gamma.' rejuvenation heat treatment at a temperature below the .gamma.'-solvus temperature (Tsolvus, .gamma.) of the superalloy, a precipitation heat treatment and an aging heat treatment.

L'invention concerne un procédé permettant de restaurer les propriétés de superalliages à base de nickel monocristallin et à orientation dirigée, et d'articles faits à partir de ceux-ci, après leur utilisation dans un environnement à haute température. Le procédé comporte les étapes consistant à mettre en oeuvre : un traitement de recuit de détente ; un traitement thermique de rajeunissement ?' à une température inférieure à la température de solubilité ?' (T¿solubilité?, ¿?'?) du superalliage ; un traitement thermique de précipitation et un traitement thermique de vieillissement.

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