STP725

    J-R Curve Characterization of A533-B Weld Metal with Irradiation and Postirradiation Annealing

    Published: Jan 1981


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    Abstract

    The potential benefit of a cyclic postirradiation annealing and reirradiation procedure is investigated as a means of mitigating the progressive embrittlement with irradiation of commercial reactor vessel steels. Material characterizations include two representative A533-B weld deposits, each containing a high copper impurity level which is associated with a high sensitivity to radiation. Assessments made on the basis of the J-R curve and tearing modulus show that intermediate annealing at 399°C has resulted in a recovery of half of the toughness which was lost with the first irradiation. Subsequent reirradiations, to a total fluence of twice that of the initial irradiation, have resulted in no additional loss in toughness, thereby suggesting a concept of embrittlement arrest associated with the annealing procedure.

    The first evidence is presented of a correlation between the CV shelf energy and an average value of tearing modulus. While differences still exist between trends in CV and the tearing modulus, it appears that an analysis of vessel integrity with the tearing instability concept is possible based upon CV upper-shelf energy.

    Keywords:

    J-integral, R-curve, elastic-plastic fracture, postirradiation annealing, reactor pressure vessels, submerged are welds, tearing modulus, CV, notch ductility, radiation


    Author Information:

    Loss, FJ
    Supervisory mechanical engineer, mechanical engineer, metallurgists, and supervisory mechanical engineer, Naval Research Laboratory, Washington, D.C.

    Menke, BH
    Supervisory mechanical engineer, mechanical engineer, metallurgists, and supervisory mechanical engineer, Naval Research Laboratory, Washington, D.C.

    Gray, RA
    Supervisory mechanical engineer, mechanical engineer, metallurgists, and supervisory mechanical engineer, Naval Research Laboratory, Washington, D.C.

    Hawthorne, JR
    Supervisory mechanical engineer, mechanical engineer, metallurgists, and supervisory mechanical engineer, Naval Research Laboratory, Washington, D.C.

    Watson, HE
    Supervisory mechanical engineer, mechanical engineer, metallurgists, and supervisory mechanical engineer, Naval Research Laboratory, Washington, D.C.


    Paper ID: STP28207S

    Committee/Subcommittee: E10.08

    DOI: 10.1520/STP28207S


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