Accession Number : ADA294664

Title :   Development of a Hydrogen-Based Annealing Process for Desulfurization of Single Crystalline, Nickel-Based Superalloy.

Descriptive Note : Final rept.,

Corporate Author : NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA

Personal Author(s) : Smith, Michael A. ; Mickle, T. H. ; Frazier, W. E. ; Waldman, J.

PDF Url : ADA294664

Report Date : 05 NOV 1994

Pagination or Media Count : 24

Abstract : The presence of minor amounts of sulfur (1-10 ppm) in nickel-based superalloys has 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

Descriptors :   *ANNEALING, *SINGLE CRYSTALS, *HYDROGEN, *NICKEL ALLOYS, *SUPERALLOYS, *DESULFURIZATION, REDUCTION, PROTECTIVE COATINGS, DIFFUSION, SULFUR, OXIDATION RESISTANCE, SPALLATION, BASE METAL.

Subject Categories : Properties of Metals and Alloys
      Inorganic Chemistry
      Physical Chemistry
      Coatings, Colorants and Finishes
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE