GRAIN REFINEMENT IN IN706 USING LAVES PHASE PRECIPITATION

摘要

Provided is a method (200) of fabricating an article, including deforming (210) an ingot of a nickel-based superalloy to form an intermediate article, forming a substantially homogeneous dispersion of Laves phase precipitates (240) within the intermediate article by cooling the intermediate article (220) and exposing the intermediate article to a temperature range (230) wherein the Laves phase precipitates are present at a concentration of at least about 0.05 % by volume and the precipitates have a mean diameter of less than one micron. Also provided is a nickel-based superalloy including a substantially homogeneous dispersion of Laves phase precipitates, wherein the intergranular and transgranular Laves phase precipitates are present at a concentration of at least about 0.1 % by volume and wherein the precipitates have a mean diameter of less than one micron. Precipitation of Laves phase may control microstructure during Thermo-mechanical processing and produce superalloys with refined grain size.