By H. I. McHenry (auth.), R. P. Reed, T. Horiuchi (eds.)
The want for trade strength resources has ended in the improve ment of prototype fusion and MHD reactors. either attainable power structures in present designs frequently require using magnetic fields for plasma confinement and focus. For the construction and upkeep of enormous five to fifteen tesla magnetic fields, supercon ducting magnets seem less expensive. however the excessive magnetic fields create huge forces, and the complexities of the conceptual reactors create critical house regulations. the combo of re quirements, plus the will to maintain building expenses at a mini mum, has created a necessity for more desirable structural alloys for provider at liquid helium temperature (4 K). The complexity of the mandatory constructions calls for that those alloys be weldable. moreover, because the plasma is prompted through magnetic fields and because magnet ic forces from using ferromagnetic fabrics in lots of configur ations might be additive, the simplest structural alloy for many applica tions could be nonmagnetic. those requisites have resulted in attention of upper power austenitic steels. power raises at low temperatures are accomplished via the addition of nitrogen. the soundness of the austenitic constitution is retained by means of including manganese rather than nickel, that is costlier. examine to boost those greater energy austenitic steels is in procedure, essentially in Japan and the United States.
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Therefore, the conductor for the TF coils of FER must be supported by high strength material ins tead of ordinary hard copper because of the high stress. The conductor for the FER will be the cable-in-conduit type and composed of superconducting cable, insulator and sheath material, as shown in Fig. 3. Accordingly, the sheath material must have sufficient strength to withstand high magnetic force produced by the superconducting cable. 5 1. Strain (%) Fig. 1 The effect of strain on the critical current of Nb 3Sn conductor K.
Tada, H. Tsuji, S. Shimamoto Japan Atomic Energy Research Institute Tokai-mura, Naka-gun, Ibaraki-ken Japan 319-11 INTRODUCTION The structural materials of the toroidal field (TF) coils for fusion reactor are required to have higher strength and fracture toughness than those of ordinary commercial products, mainly because of large electromagnetic forces. During the preliminary design of the Japanese Large Coil Task (LCT) coil at the Japan Atomic Energy Research Institute (JAERI), ordinary 304L stainless steel was selected as the structural material for the LCT coil case.
Low temperatures have been emphasized in reviews by Barrett 12 and Reed and Breedis. 2 General books on martensitic transformations include Martensitie Fundamentals and Technology 13 and Christian. 14 There have been excellent international conference proceedings on general martensitic research: Physical Properties of Martensite and Bainite,lS Mechanism of Phase Transformations in Crystalline Solids,16 Shape Memori Effect in Alloys,ll New As¥ect of Martensitic Transformations, 8 and Phase Transformations.