Magnetic characterization of ODS-Eurofer steel: Remanent magnetization and magnetostriction behavior

•Magnetic characterization of ODS-Eurofer steel annealed up to 1350°C was performed.•Relation between magnetic parameters and microstructure is discussed.•Coercive field, remanent magnetization, and magnetostriction behaviors were compared.•Hc, MR, λlong, and hardness display the same trend.•Hc, MR, λlong behaviors are influenced by pinning sites and residual stresses. Oxide dispersion strengthened ODS-Eurofer steel is a promising candidate for structural applications in future nuclear fusion reactors. Samples of 9Cr-ODS-Eurofer steel were cold rolled up to 80% thickness reduction and annealed up to 1350°C for 1h. The microstructural changes of the annealed samples were followed by magnetic measurements taken at room temperature. In comparison with the coercive field (Hc), the remanent magnetization (Mr) and longitudinal magnetostriction (λlong) behaviors can be explained only if we assume some interaction between pinning sites and residual stresses in the material. It was found that Hc, Mr, λlong, and hardness display the same trend. At the expected fusion DEMO reactor operating conditions (around 650°C and maximum magnetic field of 6T), the magnetostrictive deformation would not surpass 15ppm (15μm in 1m).