Two martensitic steels (Fe-8. 5 Cr-0. 9 MoVNb and Fe-9. 0 Cr-1. 8 MoVNb), one ferritic steel (Fe-17 Cr-1. 5 MoVNb), 316 stainless steel and Ni//3Fe were irradiated with 2 MeV electrons to 1 multiplied by 10**2**3 e/m**2. The damage recovery was studied by positron annihilation and differential scanning calorimetry (DSC). Results suggest that vacancies migrate and disappear below 330 K in the martensitic phase. Vacancies in the ferritic and austenitic phases disappear around 420 K, enhancing the precipitation. Ordered Ni//3Fe has three DSC annealing stages between 400 and 600 K.