Volume 5, Issue 3 (May 1977)

    Phase Analysis of Standard and Molybdenum-Modified Mar-M509 Superalloys


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    Phase characterization studies have been conducted by an ASTM Task Group on interlaboratory specimens of three Mar-M509-type superalloys heat treated to simulate service conditions. The results of the studies, employing X-ray and electron diffraction analysis and energy dispersive X-ray analysis, showed that the alloys contain (a) script-type metal-carbon (MC) carbides, (b) two types of eutectics (both containing M23C6-type carbides), (c) M23C6 carbides precipitated in the vicinity of script-type MC carbides and M23C6 eutectics, and (d) very fine MC carbides precipitated along crystallographic planes of the matrix phase. The molybdenum-modified Alloys XC-224 and XC-224Fe also contain M6C carbides. The compositional and crystallographic data for the phases are presented and discussed.

    Author Information:

    Bišs, V
    Senior research associateMember of ASTM, Climax Molybdenum Co. of Michigan, Ann Arbor, Mich.

    Stock #: JTE11640J

    ISSN: 0090-3973

    DOI: 10.1520/JTE11640J

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    Title Phase Analysis of Standard and Molybdenum-Modified Mar-M509 Superalloys
    Symposium , 0000-00-00
    Committee B10