Author/Authors :
Kudo، نويسنده , , Yusuke and Sakasai، نويسنده , , Akira and Hamada، نويسنده , , Kazuya and Takano، نويسنده , , Katsutoshi and Nakajima، نويسنده , , Hideo and Okuno، نويسنده , , Kiyoshi and Matsukawa، نويسنده , , Makoto and Tamai، نويسنده , , Hiroshi and Ishida، نويسنده , , Shinichi، نويسنده ,
Abstract :
Japan Atomic Energy Research Institute (JAERI) plans to construct a tokamak fusion device called JT-60SC in which superconducting magnet systems will be used. The purpose in this paper is to qualify type 316LN stainless steel (SS316LN) for use as the conduit material of the Nb3Sn cable-in-conduit conductor for the central solenoid (CS) of JT-60SC. Tensile properties, fracture toughness and fatigue crack growth rates of the as-welded metal and the aged (923 K × 240 h) one of SS316LN were evaluated at 4 K. The tensile properties and fatigue crack growth rates were adequate to ensure the design requirements for JT-60SC. However, fracture toughness of the aged weld metal could not be validated due to unstable crack growth. It was concluded that improvement of fracture toughness after aging was required to ensure the structural integrity of the CS conduit.
