Abstract
A reduced activation martensitic steel (F82H), Fe−8Cr ferrite model steel (8CrFS) and pure iron (Fe) were irradiated with 6.4 MeV Fe3+ ions at 300 °C to a displacement damage of 30 dpa at a nominal depth of 600 nm. Nano-indentation tests were performed at room temperature in continuous stiffness measurement (CSM) mode before and after the irradiation. Nix-Gao model was used to extract the nano-hardness of specimens and irradiation hardening (ΔH) was measured. Irradiation hardening was observed in all materials with F82H lowest (ΔH = 0.85 GPa) and pure iron highest (ΔH = 4.03 GPa). Transmission electron microscopy (TEM) observations indicated that dislocation loops dominated the damage microstructure after ion-irradiation. Both the average diameter and number density of dislocation loops were obtained. The correlation between microstructure and irradiation hardening was established based on dispersed barrier hardening (DBH) model. The obstacle strength factors of <100> and 1/2 <111> loops were assigned to be 0.54 and 0.17 with an assumption of linear rule.
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