Abstract
The elastic-plastic fracture toughness, J Ic , of fast neutron irradiated reactor structural materials was investigated at 427 °C using a single-specimen compliance test method. The materials included Alloy 718, Type 308 weldment, 20% cold worked Type 316 stainless steel and annealed Types 304 and 316 stainless steels. The test results show that irradiation to fluences from 1.6 to 2.2 × 10 22 n/cm 2 (8.2 to 12.0 dpa) produced a degradation of the J Ic initiation toughness level of all materials with the largest reduction observed for the Type 308 weldment. The fractographic features were found to reflect the reduced fracture toughness of the materials in the irradiated condition.
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