Void swelling and microstructure evolution of a dual phase (ferritic and austenitic) stainless steel

Abstract

In-situ HVEM irradiation experiments have been performed on both 50% austenitic and ferritic phases of dual phase stainless steel (Fe-22Cr-5Ni-3Mo-0.02C-0.1N). Voids occurred in the austenitic phase at irradiation temperatures of and higher than 673 K, The observed void swelling at a dose of 20 dpa was 0.5%, 0.7% and 1.4% at 673 K, 773 K and 873 K, respectively. In the ferritic phase, up to 20 dpa voids are not formed at irradiation temperatures of 573 K, 673 K and 773 K, while swelling occurs at 623 K at this dose, amounting to 1.4%. The void swelling behaviour is discussed and compared with the results of a previous investigation on 316 austenitic stainless steel using the HVEM.