STATUS OF EUROPEAN MATERIAL TESTING PROGRAM FOR ITER MODEL COILS AND FULL SIZE MOCKUPS

摘要

The tensile and fracture toughness properties of heavy section plates (90mm thick), and forgings (100-250 mm thick, 1-66 ton), a 1 ton casting and welded Type 316LN steel commercial products have been determined at 7 and 4.2 K with respect to the application of these structural materials for the ITER Toroidal Field Model Coil (TFMC) and for the most critical parts of the full size ITER TF coil casing. The homogeneity of the material properties and the influence of defects were investigated by testing tensile (4 and 22 mm gauge diameter) and fracture toughness (standard CT and 6 mm diameter EDM notched bar) specimens machined in all three spatial orientations. For the weldments, several commercially available filler materials and weld procedures (GTAW-HW, SAW, GMAW, SMAW, LBW, and EBW) were evaluated with the aim of establishing the most economical and industrially feasible process combined with optimum material properties. In addition, data are presented on the fatigue crack growth rates at 7 K and R-values of 0.1 and 0.4 for Incoloy 908 candidate jacket material for the ITER central solenoid model coil. The structures of the steel products are not described in this paper.