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

    Volume 5, Issue 3 (May 1977)

    ISSN: 0090-3973

    CODEN: JTEOAD

    Page Count: 7


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

    Abstract

    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.


    Paper ID: JTE11640J

    DOI: 10.1520/JTE11640J

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