Analysis of Effects in a Low activation Ferritic/Martensitic Steel by High energy Heavy-ion Irradiation
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Graphical Abstract
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Abstract
Lowactivation Ferritic/Martensitic steels are a kind of important structural materials candidate to the application in advanced nuclear energy systems. Possible degradation of properties and even failure in the condition of hightemperature and high helium production due to energetic neutron irradiation in a fusion reactor is a major concern with the application of this kind of materials. In the present work microstructural evolution in a 9Cr Ferritic/Martensitic steel (T92B) irradiated with 122 MeV 20Ne ions at temperatures between 0.3—0.5 Tm (Tm is the melting point of the material) was investigated with transmission electron microscopy. High concentration voids were observed in the specimens irradiated at high temperatures when the displacement damage dose and Ne concentration exceed a certain level. Preferential formation of voids at lathboundaries and other grainboundaries was found. The data of void swellings in 9Cr ferritic/martensitic steels irradiated in different conditions (such as with Heions, Neions, Fe/He dual beams, fast neutrons, Niions etc.) were compiled and analyzed based on a classic model of helium bubble formation, and bubble to void transition.
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