Risks and benefits of Incoloy 908
The central solenoid and toroidal field coils of ITER are designed with cable-in-conduit Nb(3)Sn superconducting conductors jacketed with Incoloy 908. This material, developed to limit the critical current degradation of the Nb(3)Sn strands, shows excellent mechanical properties at 4 °K, particularly under cycling. Nevertheless, it is a crack prone material when heat treated in the presence of oxygen, which requires careful control of the atmosphere during manufacture. A programme of extensive mechanical testing of samples and manufacture of a pancake with incoloy conductor jacket was carried out in Europe. The origin of cracks in the incoloy jacket after heat treatment was investigated.
Bibliographic Reference: An article published in: Fusion Engineering and Design, 58-59 (2001), pp. 129-134.
Record Number: 200214404 / Last updated on: 2002-02-18
Original language: en
Available languages: en