Method for making fatigue crack growth-resistant nickel-base article

摘要

Fatigue crack growth-resistant articles are made from powder metal or cast and wrought gamma prime precipitation strengthened nickel- base superalloy material, wherein a relatively high predetermined minimum strain rate, &egr;.sub.min, is employed during hot working at or near the alloy's recrystallization temperature; or alternatively a relatively high strain level, &egr;.sub.min, is employed during cold or warm working at temperatures below the alloy's recrystallization temperature. The worked articles are characterized by a uniform fine grain size, and grains which coarsen uniformly after heating at the supersolvus solutioning temperature, thereby alleviating non-uniform grain growth within the material.