A comparative assessment of metallurgical and mechanical properties of two austenitic stainless steels for the conductor jacket of the ITER Central Solenoid

作者：Sgobba Stefano^*; Libeyre Paul; Marcinek Dawid Jaroslaw; Nyilas Arman

来源：Fusion Engineering and Design, 2013, 88(9-10): 2484-2487.

DOI：10.1016/j.fusengdes.2013.05.002

• Austenitic stainless steels
• Fracture mechanics
• Fusion magnets
• Mechanical properties
• Cryogenic temperature
• ITER Central Solenoid

When energized, the ITER Central Solenoid (CS) coils will experience large cyclic electromagnetic forces that the conductor jacket itself must withstand. The jacket consists of circle-in-square extruded and drawn austenitic stainless steel pipes. High Mn-bearing austenitic stainless steels, such as the grade JK2LB selected for the jacket, feature a lower coefficient of thermal expansion between room temperature (RT) and 4K than conventional AISI 300-series steels such as 316LN. The resulting smaller integral contraction will provide an additional precompression of the CS modules during cooling down. A comparative assessment of the results issued from jackets manufactured in both a modified 316LN with extra-low carbon (0.015% max.) and JK2LB by two different producers is presented and discussed, with a particular attention to the fracture mechanics behavior of the two steels and its correlation with tensile properties at cryogenic temperature.

• 出版日期2013-10