Metallurgical method for processing nickel- and iron-based...

C - Chemistry – Metallurgy – 21 – D

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C21D 8/00 (2006.01) C21D 1/78 (2006.01) C21D 6/02 (2006.01) C21D 8/02 (2006.01) C22F 1/10 (2006.01)

Patent

CA 2299430

A method is provided for improving the microstructure of nickel- and iron- based precipitation strengthened superalloys used in high temperature applications by increasing the frequency of "special", low- .SIGMA.CSL grain boundaries to levels in excess of 50 9'0. Processing entails applying specific thermomechanical processing sequences to precipitation hardenable alloys comprising a series of cold deformation and recrystallization-annealing steps performed within specific limits of deformation, temperature, and annealing time. Materials produced by this process exhibit significantly improved resistance to high temperature degradation (e.g. creep, hot corrosion, etc.), enhanced weldability, and high cycle fatigue resistance.

La présente invention concerne un procédé permettant d'améliorer la microstructure de superalliages à base de nickel et de fer renforcés par précipitation utilisés dans les applications haute température, et consistant à augmenter à plus de 50 % la fréquence des frontières "spéciales" de grains en réseaux de sites de coïncidence (CSL) à coefficient SIGMA bas. Le procédé implique le recours à des suites de traitements thermomécaniques spécifiques appliqués à des alliages durcissables par précipitation, lesquels traitement comportent une suite d'opérations de déformation à froid et de recuit pour cristallisation menées en restant dans des limites spécifiques de déformation, de température et de durée de recuit. Les matériaux produits au moyen de ce procédé font preuve d'une résistance notablement accrue à la dégradation aux hautes températures (et notamment au fluage, et à la corrosion thermique), d'une plus grande aptitude au soudage, et d'une résistance élevée à la fatigue en cycle.

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