Method of stabilizing the superalloy composition nickel-based superalloy compositions, and superalloy article,

摘要

A stabilized superalloy composition comprises tungsten, molybdenum, and optionally rhenium, the superalloy composition being modified with a stabilizing amount of hafnium sufficient to decrease the formation of topologically close packed (TCP) phases in a superalloy microstructure at elevated temperatures with respect to a comparable unmodified superalloy composition. Articles exhibiting increased microstructure stability formed from hafnium-modified superalloy compositions may be utilized in gas turbine engines. Methods for stabilizing superalloy compositions at elevated temperatures include utilizing hafnium as a stabilizer to decrease the propensity to form TCP phases.