STP1325: Neutron Irradiation Creep at 100°C on 316L, AMCR, and Welded 316L Stainless Steel Alloys

    Hausen, H
    Institut für Angewandte Physik der Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt,

    Schüle, W
    Institut für Angewandte Physik der Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt,

    Pages: 20    Published: Jan 1999


    Abstract

    We performed measurements on the elongation of many different austentic stainless steel alloys irradiating at 100°C in a low flux channel of the High Flux Reactor at Petten varying the applied stress between zero and 300 MPa. We irradiated in total 98 samples in two irradiation rigs. Of these samples only 26 samples could be tested up to a dose of 2.1 dpa, and 13 samples up to a dose of 0.21 dpa. The steels tested are listed in Table I. In the second irradiation rig four TIG-welded samples and one EB-welded sample were irradiated.

    We found that the length of the samples increased up to an irradiation dose of 0.11 dpa and then either decreased or increased slightly depending on the magnitude of the applied stress. We attributed the increase in length to the volume change due to the formation of carbides and to the accommodation of carbides to the applied stress. The decrease of the length with irradiation time is attributed to the formation of brittle α-ferrite. The amount of α-ferrite formed increases with decreasing irradiation temperature and increases with decreasing applied stress.

    Eight samples broke during irradiation in 8 columns or stems in two rigs before the first elongation test at 0.11 or 0.21 dpa could be performed. Irradiation of 343 samples of the same materials in the last fifteen years at temperatures between 300 and 500°C did not cause fracture.

    Keywords:

    neutron irradiation creep, stainless steel alloys, TIG- and EB-welds, micro-structure, radiation damage, “low” irradiation temperature


    Paper ID: STP13907S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP13907S


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