Helium bubble evolution in F82H-mod – correlation between SANS and TEM

Investigation of microstructural evolution under neutron irradiation in Eurofer97 steel by means of small-angle neutron scattering

“…A preliminary analysis of the SANS spectra shown in Fig. 3(a) has therefore been carried out assuming that the defects produced under the investigated irradiation conditions are microvoids and taking, therefore, the neutron 'contrast' simply as the neutron scattering length density of the Eurofer steel, that is (Dq) 2 = 5.70 Â 10 À19 cm À4 [13]; in case, such inhomogeneities were helium bubbles, a more complex data analysis would be required taking into account the dependence of the bubble radius on the helium pressure inside the bubble itself [14,15]. The obtained volume distributions are presented in Fig.…”

The European effort towards the development of a demo structural material: Irradiation behaviour of the European reference RAFM steel EUROFER

“…As far as microstructural examinations are concerned, investigations recently completed or currently in progress include scanning and transmission electron microscope (SEM and TEM), positron annihilation spectroscopy (PAS) and small angle neutron scattering (SANS) [25][26][27].…”

Helium effects on creep properties of Fe–14CrWTi ODS steel at 650 °C

“…When a bubble reaches this size it will further grow continuously. However, there are investigations over a wide temperature range which show that there is no HTHE in martensitic stainless steels [26,27], although helium bubbles are formed, grow and transfer into voids in the interior and at the boundaries of grains in such materials [9,28,29]. Up to now, only a tentative explanation of this different behaviour of austenitic and ferritic/ martensitic materials is given in terms of the more complex microstructure of the latter.…”