Accession Number : ADP004216

Title :   Understanding the Roles of the Strategic Element Cobalt in Nickel Base Superalloys,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CENTER

Personal Author(s) : Stephens,J. R. ; Dreshfield,R. L.

Report Date : APR 1984

Pagination or Media Count : 15

Abstract : The United States imports over 90 percent of its cobalt, chromium, tantalum and columbium -- all key elements in high temperature nickel-base superalloys for aircraft gas turbine disks and airfoils. NASA, through joint government/industry/university teams, has undertaken a long-range research program (COSAM - Conservation of Strategic Aerospace Materials) aimed at reducing or eliminating these strategic elements by examining their basic roles in superalloys and identifying viable substitutes. This paper discusses research progress in understanding the effects of cobalt and some possible substitutes on microstructure, mechanical properties, and environmental resistance of turbine alloys. (Author)

Descriptors :   *Cobalt, *Strategic materials, *Nickel alloys, *Superalloys, Research management, Conservation, Substitutes, Microstructure, Mechanical properties, Environmental tests, Resistance, Turbine components, Disks, Airfoils, Symposia

Distribution Statement : APPROVED FOR PUBLIC RELEASE