Further observations on the formation of sigma phase in a nickel-base superalloy (IN-100)
[electronic resource] /
Robert L. Dreshfield and Richard L. Ashbrook.

Description

Main Author

Dreshfield, Robert L.

Related Names

Ashbrook, Richard L.
Lewis Research Center.
United States. National Aeronautics and Space Administration.

Language(s)

English

Published

Washington, D.C. : National Aeronautics and Space Administration : 1970.

Subjects

Isothermal transformation diagrams.
Heat resistant alloys.
Nickel alloys.

Summary

Sigma-free, moderately, and very sigma prone cast IN-100 were exposed at 1550' F (843' C) for 250 and 2500 hours to permit sigma to form. As sigma increased, rupture life, tensile strength and ductility decreased. Yield strength at room temperature increased after exposure for 250 hours. Exposure times of 2500 hours caused the yield to approach or fall below the as cast values. Sigma isothermal transformation curves were prepared for wrought and cast IN-100 having essentially the same compositions. Wrought material exposed in a stress gradient at 1550' F (843' C) was examined for a stress effect on sigma formation.

Physical Description

30 p. : ill. ; 27 cm.

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