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AssigneeGeneral Electric Company
InventorsJEFFREY ALLEN HAWK, ROBIN CARL SCHWANT
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A method of heat treating a superalloy article is disclosed. The method includes hot-working an article comprising an superalloy to produce a hot-worked microstructure throughout the article; solution treating the article at a temperature and for a time sufficient to form a partially recrystallized warm-worked microstructure throughout the article; and cooling the article. The method also includes precipitation aging the article at a first precipitation aging temperature of about 1300° F. to about 1400° F. for a first duration of about 4 hours to about 12 hours; cooling the article to a second precipitation aging temperature; precipitation aging the article at a second precipitation aging temperature of about 1150° F. to about 1200° F. for a second duration of about 4 hours to about 12 hours; and cooling the article from the second precipitation aging temperature to an ambient temperature.
A method of heat treating an article comprising an Ni-base superalloy having a hot-worked microstructure throughout the article:
An article comprising an Ni-base superalloy and having a partially-recrystallized, warm-worked bimodal, bimorphic microstructure comprising gamma prime and gamma double prime throughout the article, wherein the bimodal, bimorphic microstructure comprises larger elongated grains interspersed with smaller equiaxed grains.
An article comprising an Ni-base superalloy and having a partially-recrystallized, warm-worked bimodal, bimorphic microstructure comprising gamma prime and gamma double prime throughout the article and a static crack propagation resistance in air of at least about 2400 hours at a temperature of about 1,100° F., wherein the bimodal, bimorphic microstructure comprises larger elongated grains interspersed with smaller equiaxed grains.
Dependencies are inferred from the claim text.