Characteristics of unirradiated and 60 °C, 2.7 dpa irradiated Eurofer97

After the delivery of various product forms of Eurofer97, NRG has started a comprehensive characterisation effort. A laboratory-scale heat with the same specifications has been acquired as well. A 2.7 dpa irradiation has been carried out in the high flux reactor at Petten at reactor ambient temperature. Microstructural properties are investigated. Pre-irradiation as well as post-irradiation tensile, impact properties, and transition fracture toughness are determined. The microstructure of Eurofer97 is martensitic with ASTM 10.2 prior austenite grain size and few inclusions. Impact properties of the 25 mm plate are impaired: DBTT of −75 °C as opposed to −100 °C for the other forms. Tensile properties of Eurofer97 before and after irradiation are comparable to that of F82H under similar conditions. In impact tests, the Eurofer lab-scale heat outperforms F82H: the DBTT after irradiation is around −17 °C in stead of +35° for F82H-mod. Static fracture toughness tests show a larger shift in transition temperature than the impact tests.