SYMPOSIA PAPER Published: 09 February 2018
STP87019850036

Fracture Toughness of Accelerated Irradiated Submerged-Arc Weld Metal

Source

Submerged-arc weld material has been exposed to accelerated irradiation at ~180°C to a nominal total fast neutron dose of ~5 × 1017 neutrons (n)/cm2 (E > 1 MeV). The effect of this irradiation on the fracture toughness has been measured using both precracked Charpy and 25-mm compact tension specimens.

Results show that upper-shelf fracture toughness values, though within the scatter-band on unirradiated control data, appear to be reduced by irradiation. No change in fracture toughness transition temperature is induced by the accelerated irradiation exposure. Comparison of the accelerated irradiation data with that obtained from much lower dose rate irradiations indicates the importance of irradiation exposure time. The effect of exposure time is explained in terms of the precipitation of small copper-rich complexes. This proposal is supported by preliminary small-angle neutron scattering data.

Author Information

Priest, Robert, H.
Central Electricity Generating Board, Berkeley Nuclear Laboratories, Berkeley, GB
Charnock, William
Central Electricity Generating Board, North Western Region Scientific Services Department, Manchester, GB
Neale, Brian, K.
Central Electricity Generating Board, Berkeley Nuclear Laboratories, Berkeley, GB
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Details
Developed by Committee: E10
Pages: 1150–1162
DOI: 10.1520/STP87019850036
ISBN-EB: 978-0-8031-7679-9
ISBN-13: 978-0-8031-0592-8