Roldán, MarceloFernández, PilarRams, JoaquínSánchez, FernandoGómez Herrero, Adrián2023-06-172023-06-172018-11-292072-666X10.3390/mi9120633https://hdl.handle.net/20.500.14352/12627The effect of post-helium irradiation annealing on bubbles and nanoindentation hardness of two reduced activation ferritic martensitic steels for nuclear fusion applications (EUROFER97 and EU-ODS EUROFER) has been studied. Helium-irradiated EUROFER97 and EU-ODS EUROFER were annealed at 450 °C for 100 h in an argon atmosphere. The samples were tested by nanoindentation and studied by transmission electron microscopy extracting some focused ion beam lamellae containing the whole implanted zone (≈50 µm). A substantial increment in nanoindentation hardness was measured in the area with higher helium content, which was larger in the case of EUROFER97 than in EU-ODS EUROFER. In terms of microstructure defects, while EU-ODS EUROFER showed larger helium bubbles, EUROFER97 experienced the formation of a great population density of them, which means that the mechanism that condition the evolution of cavities for these two materials are different and completely dependent on the microstructure.engAtribución 3.0 Españahttps://creativecommons.org/licenses/by/3.0/es/journal articlehttps://doi.org/10.3390/mi9120633https://www.mdpi.com/2072-666X/9/12/633open accessnanoindentationreduced activation ferritic martensitic (RAFM) steelshelium irradiationirradiation hardeningnuclear fusion structural materialsElectrónica (Física)Electrónica (Informática)2203 Electrónica