The Physical Metallurgy of Cobalt-base Superalloys
The Physical Metallurgy of Cobalt-base Superalloys

Author: H J Wagner

Publisher:

Published: 1962

Total Pages: 102

ISBN-13:

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A detailed picture is presented of the physical and chemical phenomena that affect the behavior of cobalt-base superalloys. Solid-solution strengthening is obtained from the high-melting metallic elements molybdenum, tungsten, tantalum, and columbium. These elements also participate in precipitation reactions involving their carbides. Precipitation of intermetallic compounds such as Ni3Ti is an important process in cobalt alloys containing appreciable amounts of nickel and titanium. The relationships among microstructure, heat treatment, and mechanical properties of the important commercial alloys are considered, and whenever possible, explained on the basis of the physical and chem cal processes that occur. (Author).

A Primer on Soviet Superalloys
A Primer on Soviet Superalloys

Author: J. Prock (Jr.)

Publisher:

Published: 1966

Total Pages: 64

ISBN-13:

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Soviet nickel-base and cobalt-base alloys for high-temperature operation are described. Wrought and cast turbine blading alloys are included, as well as oxidation-resistant sheet alloys. Mechanical and physical properties of each alloy are assembled, and a detailed list of references is presented. Where possible, the specific applications are noted. It was concluded that the Soviets have made significant contributions to superalloy development, having successfully circumvented a shortage of cobalt and molybdenum. (Author).

Understanding the Roles of the Strategic Element Cobalt in Nickel Base Superalloys
Understanding the Roles of the Strategic Element Cobalt in Nickel Base Superalloys

Author: Joseph R. Stephens

Publisher:

Published: 1983

Total Pages: 30

ISBN-13:

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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).