Abstract
Polarised SANS has been used to investigate two martensitic steels for fusion reactor technology (MANET and OPTIFER, differing in their initial Cr content), before and after neutron irradiation. The measurements were carried out at the instrument D22 of the ILL, Grenoble, using an ad hoc polarised beam set-up. The results show both the occurrence of Cr redistribution phenomena with correlated changes in the composition of the precipitate phases, and the growth of non-magnetic defects (possibly microvoids), depending on the irradiation conditions and on the original steel composition.
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