Abstract
Small to ultra-small 1/3 size pre-cracked Charpy and 1.65 × 1.65 × 9 mm deformation and fracture minibeam (DFMB) specimens of the F82H IEA heat were irradiated to 0.02 and 0.12 dpa at 290 °C in the Japanese Materials Test Reactor. Nominal cleavage transition temperature shifts, based on the measured toughness, K Jm( T), data (Δ T m) as well as reference temperature shifts (Δ T 0) found after size-adjusting the K Jm( T) data yielded Δ T m/0 ≈ 27 ± 10 and 44 ± 10 at the two doses, respectively. Using measured yield stress changes (Δ σ y), the C 0 = Δ T 0/Δ σ y = 0.58 ± 0.14 at 0.12 dpa, is in good agreement with data in the literature. The dynamic transition temperature shift, Δ T d, derived from DFMB tests, was ≈30 ± 20 °C at 0.1 dpa, also in good agreement with the estimated Δ T 0 shifts. The Δ T d and Δ T 0 are also in excellent agreement with a Δ T 0 = C 0Δ σ y (dpa, T i) hardening-shift model, where the Δ σ y (dpa, T i) was found by fitting a large database of tensile properties.
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