Radiation swelling of ferritic-martensitic steels EP-450 and HT-9 under irradiation by metallic ions to super-higher doses; Radiatsionnoye raspukhaniye ferrito-martensitnyikh stalej EP-450 i HT-9 pri obluchenii metallicheskimi ionami do sverkhvisokikh doz

Swelling of ferritic-martensitic steels EP-450 and HT-9 is studied under irradiation by Cr ions up to the doses 300 dpa. In temperature range 430-550 {sup o}C parameters of porosity, incubation dose, dose range where the swelling range reaches the steady state were determined. It was shown that swelling of ferritic steel may exceed 20 %. The obtained results show that radiation swelling of ferritic-martensitic steels is the critical parameter that may considerably limit the commercial use of reactors of generation 3 and 4.