STP1165

    The Microstructure of Laser-Welded Aluminum Bronzes

    Published: Jan 1993


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    Abstract

    Macrophotography, light microscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM) have been employed to characterize the microstructures that develop in laser-welded nickel-aluminum bronze (NAB). The investigation has also documented the microstructures that are present in the base plate prior to welding and has shown how these latter microstructures change the nature of the heat-affected-zone (HAZ). The weld zone is primarily martensitic but also contains proeutectoid α (the copper-rich face-centered cubic (fcc) solid solution). Small particles of a second phase are also present and would appear to be nickel aluminum (NiAl). In general, the structure of the weld zone is equiaxed although columnar grains are observed occasionally in the vicinity of the fusion line. Mixed α/martensite and mixtures of α/eutectoidal microstructures develop in the HAZ and these microstructures are strongly influenced by the microstructure of the base plate. Finally, in addition to the various κ phases, an as yet unidentified phase, which develops as plates on the {111}α matrix planes, has been documented.

    Keywords:

    nickel-aluminum bronzes, laser welding, cast material, wrought material, micro-structural analysis, scanning electron microscopy, transmission electron microscopy, metallog-raphy, metallurgical specimens, microstructure, metallographic techniques


    Author Information:

    Bell, DE
    Graduate students and professor, The Pennsylvania State University, University Park, PA

    Marsico, TA
    Research assistant, The Pennsylvania State University, University Park, PA

    Petrolonis, K
    Graduate students and professor, The Pennsylvania State University, University Park, PA

    Denney, PE
    Research assistant, The Applied Research Laboratory, The Pennsylvania State University, University Park, PA

    Howell, PR
    Graduate students and professor, The Pennsylvania State University, University Park, PA


    Paper ID: STP25111S

    Committee/Subcommittee: E04.08

    DOI: 10.1520/STP25111S


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