Development of a Hydrogen-Based Annealing Process for Desulfurization of SingleCrystalline, Nickel-Based Superalloy

摘要

The presence of minor amounts of sulfur (1-10 ppm) in nickel-based superalloyshas been associated with reduced oxidation resistance and premature spallation of protective coatings. A hydrogen annealing process has been developed by NAWCADWAR which effectively reduces the sulfur content of superalloys. The conditions which allow effective desulfurization are delineated. Diffusion of sulfur through the superalloy is found to be the rate controlling step for the process. jg.