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Further observations on the formation of sigma phase in a nickel-base superalloy (IN-100)

Author: Robert L Dreshfield; Richard L Ashbrook; United States. National Aeronautics and Space Administration.; Lewis Research Center.
Publisher: Washington, D.C. : National Aeronautics and Space Administration : [For sale by the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151], 1970.
Series: NASA technical note, D-6015.
Edition/Format:   Print book : National government publication : EnglishView all editions and formats
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  Read more...
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Details

Material Type: Government publication, National government publication, Internet resource
Document Type: Book, Internet Resource
All Authors / Contributors: Robert L Dreshfield; Richard L Ashbrook; United States. National Aeronautics and Space Administration.; Lewis Research Center.
OCLC Number: 57582421
Description: 30 pages : illustrations ; 27 cm.
Series Title: NASA technical note, D-6015.
Other Titles: NASA TN D-6015
Responsibility: Robert L. Dreshfield and Richard L. Ashbrook.

Abstract:

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.

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Primary Entity

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