Effect of irradiation temperature on the fracture-mechanical behaviour of tungsten irradiated to 1 dpa

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  • IKET KIT INE - Karlsruhe Institute of : Institute for Nuclear Waste Disposal

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Abstract

We investigate the influence of neutron irradiation on the fracture-mechanical behaviour of ITER- specification conform stress relieved tungsten bar. The neutron irradiation of miniaturized Disc-shaped Compact Tension specimens with electrical discharge machined notches was performed in the Material Testing High Flux BR2 reactor of SCK CEN in Mol. Damage doses close to 1 dpa were achieved at multiple irradiation temperatures of 40 0, 60 0 and 10 0 0 °C. Suppression of thermal neutrons fluence by applying stainless steel capsules resulted in reduction of Re (Os) content down to fusion application relevant level of 2 at% (0.2 at%). Neutron irradiation strongly impacted fracture-mechanical behaviour of the material. Depending on the irradiation temperature, the DBTT increases by about 650 °C or even higher as has been deduced on the basis of the load-displacement curve analysis. The degradation of the mechanical proper- ties is attributed to the alteration of the microstructure and fracture mode. The results are compared with the fracture-mechanical data on irradiated tungsten obtained previously in the course of same neutron irradiation campaign.

Details

Original languageEnglish
Article number153200
Pages (from-to)1-6
Number of pages6
JournalJournal of Nuclear Materials
Volume556
DOIs
Publication statusPublished - 19 Jul 2021

Keywords

  • Polycrystalline tungsten, Neutron irradiation, Fracture toughness

ID: 7203471