Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7833197 | Applied Surface Science | 2018 | 8 Pages |
Abstract
Micro-scale damage with a topographical contrast has been observed in cold-worked Nb-stabilised 20%Cr-25%Ni stainless steel, following irradiation with 2.2â¯MeV protons at 400â¯Â°C and a dose rate of â¼10â5â¯dpa/s. After an irradiation dose of 3 and 5â¯dpa, microstructural changes were found to a depth of 22â¯Î¼m below the irradiated surface, coincident with the estimated mean range of protons in the material as predicted by the TRIM code. Large variations of intragranular mis-orientations, in combination with a depletion of chromium at grain boundaries, were observed in the proton-irradiated layer. This was accompanied by an increase in nano-hardness, which was linked to a partial transformation of tangled dislocation networks into dislocation loops. Such visible microstructural changes have not been reported before in the absence of post-irradiation annealing treatments.
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Authors
A.F. Alshater, D.L. Engelberg, C.J. Donohoe, S.B. Lyon, A.H. Sherry,