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    Use of the Disk Bend Test to Assess Irradiation Performance of Structural Alloys


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    The disk bend test has been a valuable technique for rapid evaluation of the ductility of a large number of alloys under consideration for use as structural materials in the breeder and fusion reactor programs. The test employs the 3-mm-diameter, 0.3-mm-thick microscopy and density disk specimen, conserving valuable experimental volume in the limited reactor space available.

    The test involves bending the disk symmetrically about the center, producing a simple, axisymmetric stress state. Experimental results are in agreement with a theoretical analysis of the bend configuration. The advantages and limitations of the technique are discussed.

    The test has shown that commercial precipitation-strengthened alloys and the Path B alloys of the U.S. Fusion Program exhibit unacceptably low ductilities following irradiation. This was demonstrated for a number of alloys, in a variety of thermomechanical conditions, including cold worked, cold worked and aged, and solution treated and aged.


    disk bend, Path B alloys, nickel-base alloys

    Author Information:

    Hamilton, ML
    Westinghouse Hanford Company, Richland, WA

    Huang, FH
    Westinghouse Hanford Company, Richland, WA

    Committee/Subcommittee: E10.02

    DOI: 10.1520/STP32992S