Patent ID: 7074284

Claim:
A heat treatment process for a single-crystal or directionally solidified material body comprising a nickel-based superalloy with a volumetric Î³â€² content V tot after complete heat treatment of at least 50%, the material body being solution-annealed and then Î³â€² particles being precipitated in various sizes at different temperatures wherein, at a first temperature, Î³â€² particles of larger than 1 Î¼m are precipitated in a proportion by volume of V tot âˆ’V 1 of less than 50%, where V 1 is the proportion of the Î³â€² particles which is larger than 1 Î¼m, and, at least at a second temperature, Î³â€² particles of less than 1 Î¼m are precipitated, wherein the precipitation of Î³â€² particles of greater than 1 Î¼m in a material with a composition of (% by weight) Niâ€”6.5% Crâ€”9.6% Coâ€”0.6% Moâ€”6.4% Wâ€”6.5% Taâ€”3% Reâ€”5.6% Alâ€”1.0% Tiâ€”0.2 Hfâ€”230 ppm Câ€”70 ppm B is carried out a temperature of between 1180Â° C. and 1275Â° C.