The Effect of Plastic Deformation on Low Temperature Mechanical and Magnetic Properties of Austenite 316LN Tube for ITER TF Conductor

• Published in: IEEE transactions on applied superconductivity Vol. 22; no. 3; p. 7800204
• Main Authors: Park, Soo-Hyeon, Kim, Jun Young, Park, Won Woo, Choi, Heekyung, Ma, Young Jae, Kwon, Soun Pil, Kim, Keeman, Kang, Sung Chan, Lee, Dong Hee
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.06.2012; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Austenite stainless steel; Austenitic stainless steels; Conductors (devices); cryogenics; Electric connection. Cables. Wiring; Electrical engineering. Electrical power engineering; Electromagnets; Electron tubes; Exact sciences and technology; Hardness tests; Heat treatment; Magnetic permeability; Magnetic properties; Magnetic susceptibility; Metallurgy; Plastic deformation; Plastics; Steel; Strain; Temperature measurement; tensile test; Tensile tests; Tubes; Various equipment and components; Winding; Hardness test; Heat treatment; ITER tokamak; Compaction; Plastic deformation; Magnetic susceptibility; tensile test; Cryogenics; Electrical conductor; Low temperature; Machine windings; Magnetic properties; Austenite stainless steel; Magnet; Mechanical properties; Compact design; Failures; Tension test; Electrical discharge machining; Magnetic measurement; Nuclear fusion reactor; Pipe cable; Manufacturing process; Stainless steel; Superconducting cable
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/TASC.2011.2176894

While the manufacturing of superconducting CICC (cable in conduit conductor) and winding conductors into winding packs for ITER TF magnets, cold work is unavoidably applied on the jacketing tube. This article investigates the effect of plastic deformation on low temperature mechanical and magnetic properties of austenite 316LN stainless steel tube for ITER TF conductor. To simulate the manufacturing process of TF magnet, tubes were compacted, extended to 2.5% in longitudinal direction and heat treated. After each step, specimens were sectioned using wire cutting EDM, and tensile tests at 4 K, magnetic susceptibility measurements, and hardness tests have been carried out on those specimens. Remarkable reductions of elongation at failure have been observed as the amount of cold work is increased through compaction and extension. Further, correlations among results of tensile tests, magnetic susceptibility measurements and hardness tests are presented.