Self-Weding behavior of various materials in a sodium environment; Self-welding of SUS316 and hard chrome plating

not registered; Kano, Shigeki; Namekawa, Masaru; Owada, Tetsuro*; Atsumo, Hideo

Self-Welding occurs at the contact surface point of two materials in high-temperature sodium. In this experiment We conducted as to self-welding tendencies of the candidate materials for the fuel-assembly pad in high temperature Sodium. The results obtained are as follows: (1)Austenitic stainless steel (SUS316) showed a marked tendency to self-weld at 600C, and some different material couples with SUS420 and CrC (coated with plasma-spray) were self-welded by the formation of diffusion layer. (2)Hard chrome plating material couples with austenitic stainless steel showed tendency to self-welding, but the same material couples showed little welding. (3)Numerous crackings were showed on surface layer of the hard chrome plating after sodium immersion test. (4)Molybdinum and Hard alloy materials showed no-self welding.