Mechanical properties and microstructure in low activation martensitic steels211 f82h and optimax after 800 mev proton irradiation

摘要

Low-activation martensitic steels, F82H (mod.) and Optimax-A, have been211u001eirradiated with 800-MeV protons up to 5.9 dpa. The tensile properties and 211u001emicrostructure have been studied. The results show that radiation hardening 211u001eincreases continuously with irradiation dose. F82H has lesser irradiation 211u001ehardening as compared to Optimax-A in the present work and DIN1.4926 from a 211u001eprevious study. The irradiation embrittlement effects are evident in the 211u001ematerials since the uniform elongation is reduced sharply to less than 2%. 211u001eHowever, all the irradiated samples ruptured in a ductile-fracture mode. Defect 211u001eclusters have been observed. The size and the density of defect clusters increase 211u001ewith the irradiation dose. Precipitates are amorphous after irradiation.