MONOCRYSTALLINE SUPERALLOY WITH NICKEL-BASE MATRIX, PROCESS FOR IMPROVING ARTICLES MADE FROM THIS ALLOY AND ARTICLES OBTAINED BY THIS PROCESS

摘要

1. A method of increasing the resistance to creep of a part made from a monocrystalline superalloy with a nickel based matrix and having the following composition by weight : Al 5.4% to 6.2% Co 4% to 7% Cr 6% to 9% Mo 0% to 2.5% Ta 5.5% to 8% Ti 0% to 1% W 7% to 9% Ni and any impurities balance to 100%, including heating the part to a temperature suitable for putting all its Y' phase of the Ni3 Al type into solution, and characterised in that after this heating the part is raised to a temperature greater than 1000 degrees C at which the Y' phase is precipitated into the Y solid solution.