Effects of the forming processes and Y2O3 content on ODS-Eurofer mechanical properties

This work investigates the effects of manufacturing processes on the behaviour of ODS alloys based on the Eurofer composition (Fe–9%CrWVTa). Materials were produced by mechanical alloying with two fractions of Y2O3 strengthening particles (0.3% and 0.5% in weight). The ODS powders were consolidated by hot isostatic pressing (HIP) and hot extrusion (HE). In case of HE, two distinct extrusion dies geometry were used to obtain circular or rectangular cross-sections bars. Cold rolling (CR) trials were also applied to rectangular cross-section bars to obtain 1 mm thick plates with a high cumulated cold work level (ε = 80%). Microstructure, impact and tensile properties of selected samples are compared to assess the effects of the consolidation process (HIP or HE), the Y2O3 content and the shape of the extrusion die.