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Mechanical properties of high manganese austenitic stainless steel JK2LB for ITER central solenoid jacket material

ITERセンターソレノイドコイルに用いられるJK2LBの高マンガンオーステナイト鋼の機械的性質

齊藤 徹; 河野 勝己; 山崎 亨; 尾関 秀将; 礒野 高明; 濱田 一弥*; Devred, A.*; Vostner, A.*

Saito, Toru; Kawano, Katsumi; Yamazaki, Toru; Ozeki, Hidemasa; Isono, Takaaki; Hamada, Kazuya*; Devred, A.*; Vostner, A.*

A suite of advanced austenitic stainless steels are used for the superconductor jacket, magnet casing and support structure in the ITER TF, CS and PF coil systems. These materials will be exposed to cyclic-stress environment at cryogenic temperature. The CS jacket suffers high electromagnetic force with 60,000 cycles during its life time. Therefore, high manganese austenitic stainless steel JK2LB, which has high tensile strength, high ductility, and high resistance to fatigue at 4K has been chosen for the CS conductor. The cryogenic temperature mechanical property data of this material are very important to ITER magnet design but not much data were available. This study is focused on mechanical characteristics of JK2LB and its weld joint. We present results from tensile tests, fracture toughness, fatigue crack growth rate and fatigue at 4K. Test result of tensile tests, fracture toughness, fatigue crack growth rates and fatigue satisfy the ITER requirements.

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