Crack-Arrest Tests on Two Irradiated High-Copper Welds. Phase 2. Results of Duplex-Type Experiments

摘要

The objective of the Heavy-Section Steel Irradiation Program Sixth Irradiation Series is to determine the effect of neutron irradiation on the shift and shape of the lower-bound curve to crack-arrest toughness data. Two submerged-arc welds with copper contents of 0.23 and 0.31 wt % were commercially fabricated in 200-mm-thick plate. Crack-arrest specimens fabricated from these welds were irradiated at a nominal temperature of 288 C to an average fluence of 1.9 x 10 to the l9th power neutrons/sg cm (>l MeV). This is the second report giving the results of the tests on irradiated duplex-type crack-arrest specimens. Charpy V-notch specimens irradiated in the same capsules as the crack-arrest specimens were also tested, and a 4l-J transition temperature shift was determined from these specimens. 'Mean' curves of the same form as the ASME K(sub la) curve were fit to all the data with only the reference temperature as a parameter. The shift between the mean curves agrees well with the 4l-J transition temperature shift obtained from the Charpy V-notch specimen tests.