Post Irradiation Mechanical Behaviour of Three EUROFER Joints

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Abstract

The post-irradiation mechanical properties of three EUROFER joints (two diffusion joints and one TIG weld) have been characterized after irradiation to 1.8 dpa at 300 °C in the BR2 reactor. Tensile, KLST impact and fracture toughness tests have been performed. Based on the results obtained and on the comparison with data from EUROFER base material irradiated under similar conditions, the post-irradiation mechanical behaviour of both diffusion joints ("laboratory" and "mock-up") appears similar to that of the base material. The properties of the TIG joint are affected by the lack of a post-weld heat treatment, which causes the material from the upper part of the weld to be significantly worse than that of the lower region. Thus, specimens from the upper layer exhibit extremely pronounced hardening and embrittlement caused by irradiation. The samples extracted from the lower layer show much better resistance to neutron exposure, although their measured properties do not match those of the diffusion joints. The results presented demonstrate that diffusion joining can be a very promising technique.

Details

Original languageEnglish
PublisherSCK CEN - Belgian Nuclear Research Center
Number of pages36
Volume1
Edition1
Publication statusPublished - 22 Aug 2006

Publication series

NameSCK•CEN Reports
PublisherStudiecentrum voor Kernenergie
No.BLG-1029

Keywords

  • EUROFER, diffusion joints, TIG joint, post-irradiation behaviour, post-weld heat treatment

ID: 222860