STP430

    Electron Microstructure Study of an Iron-Nickel Base Heat-Resistant Alloy Containing Cobalt

    Published: Jan 1968


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    Abstract

    An electron microstructure study was carried out to understand the precipitation behavior of age-hardening gamma-prime in an iron-nickel base high temperature alloy, Pyromet 860, containing 4 weight per cent cobalt. Carbon extraction replica and thin foil transmission electron microscopy were used. The extraction replica study showed gamma-prime to have many random orientations in addition to some preferred orientation. The thin film microscopy did not show any contrast effect due to coherency strains and confirmed many orientations of gamma-prime precipitates.

    Keywords:

    metallography, electron microscopes, iron-nickel alloys, cobalt, precipitation hardening alloys, microstructure, gamma-prime precipitates


    Author Information:

    Maniar, G. N.
    Supervisor and assistant physicist, Applied Physics Section of the Research Laboratory, The Carpenter Steel Co., Reading, Pa.

    James, H. M.
    Supervisor and assistant physicist, Applied Physics Section of the Research Laboratory, The Carpenter Steel Co., Reading, Pa.


    Paper ID: STP41825S

    Committee/Subcommittee: E04.11

    DOI: 10.1520/STP41825S


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