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Jóźwik-Biała, I.
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article
The effect of Ar-ion irradiation on nanomechanical and structural properties of ODS RAF steels manufactured by using HIP technique
Abstract
The influence of low energy ion irradiation on mechanical and structural properties of Oxide DispersionStrengthened (ODS) Reduced Activation Ferritic (RAF) steels were investigated using Nanoindentation(NI), High Resolution Scanning Electron Microscopy (HR SEM) and Energy Dispersive X-ray Spectroscopy(EDS) techniques. ODS samples were manufactured by means of High Isostatic Pressing (HIP) techniqueand irradiated at room temperature with 320 keV Ar2þ ions up to fluences reaching 11016 cm2. Theresults revealed fast increase of nanohardness in the function of two dependencies: (i) vanadiumaddition and (ii) ion fluence range. Furthermore, along with increasing vanadium content, the increase inthe number of ~100 nm sized precipitates consisting of Cr-O-V and Cr-C-V with small amounts of alloyingelements (Ti, Al, W) have been observed. Simultaneously, the presence of nano-precipitates, with averagesize below 10 nm has been recorded. Conducted research confirms that their number decreases withincreasing V content. The reported hardening effect is most probably related to: (i) quantity and size ofprecipitates identified as chromium-vanadium oxides and carbides with addition of alloying elementsand (ii) level of damage created by ion irradiation.