STP557

    Microstructure Approach to Property Optimization in Wrought Superalloys

    Published: Jan 1974


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    Abstract

    The effects of structure control available from the precipitating phases in wrought superalloys were demonstrated in a recent review. It was shown that criteria for selection of superalloys should be reviewed periodically to establish that they reflect the state of the art. For example, expensive materials may have been specified where lower cost alloys could do a job equally well. This is especially true for superalloys in applications where properties up to about 1200°F are critical.

    This paper reviews some results of the continuing study by superalloy metallurgists to reveal means of “retrograding” elevated temperature requirements to lower cost compositions that, combined with proper processing, will meet property requirements. It is shown that microstructure studies, combined with knowledge of phase relationships, prove to be an invaluable tool. Recent examples of improved hot-work behavior, heat-treat response, and property development are reviewed. Effects of thermomechanical processing are also discussed.

    Keywords:

    heat resistant alloys, microscopy, tensile properties, X-ray diffraction, precipitation hardening, microstructure


    Author Information:

    Muzyka, DR
    Managermanager, Alloy Research and DevelopmentPhysical Metallurgy Research and DevelopmentCarpenter Technology Corp., Research and Development Center, Reading, Pa.

    Maniar, GN
    Managermanager, Alloy Research and DevelopmentPhysical Metallurgy Research and DevelopmentCarpenter Technology Corp., Research and Development Center, Reading, Pa.


    Paper ID: STP33334S

    Committee/Subcommittee: E04.05

    DOI: 10.1520/STP33334S


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