Tensile Test Results on Compacted and Annealed 316ln Material

Weiss, K.P.; Ehrlich, A. C.; Corte, A. della; Vostner, A.

doi:10.1063/1.3402329

Cited by 9 publications

(3 citation statements)

References 8 publications

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“…The latter, combined with the effect of cold work produced during compaction and subsequent handling operations, can induce a loss of ductility at 4.2 K. Hence, it is critical to characterize the resulting level of embrittlement and to ensure that the material behavior is predominantly ductile in the stress range of interest. As the TF tube thickness ( 2 mm) is too small to enable the preparation of suitable samples for fracture toughness (K IC ) and fracture crack growth rate (FCGR) measurements, it was decided to circumvent this difficulty by implementing a specification on the maximum elongation of at least 20% below 7 K. It is also required to carry out a micrographic examination of the fracture surfaces so as to assess the extent of the dimple pattern zone, resulting from ductile fracture, and of the inter-granular surfaces, resulting from brittle fracture caused by grain boundary sensitization [99]. This is illustrated in Figure 36 which shows examples of tensile test specimens cut out from TF jacket sections after compaction, stretching and ageing.…”

Section: Jacket Sectionsmentioning

confidence: 99%

Challenges and status of ITER conductor production

Devred

Backbier

Bessette

et al. 2014

Supercond. Sci. Technol.

177

118

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Taking the relay of the Large Hadron Collider (LHC) at CERN, ITER has become the largest project in applied superconductivity. In addition to its technical complexity, ITER is also a management challenge as it relies on an unprecedented collaboration of 7 partners, representing more than half of the world population, who provide 90% of the components as in-kind contributions. The ITER magnet system has a stored energy of 51 GJ and involves 6 of the ITER partners. The coils are wound from Cable-In-Conduit Conductors (CICCs) made up of superconducting and copper strands assembled into a fully transposed, rope-type cable, inserted into a conduit of butt-welded austenitic steel tubes. The conductors for the Toroidal Field (TF) and Central Solenoid (CS) coils require about 500 tons of Nb 3 Sn strands while the Poloidal Field (PF) and Correction Coil (CC) and busbar conductors need around 250 tons of Nb-Ti strands. The required amount of Nb 3 Sn strands far exceeds pre-existing industrial capacity and has called for a significant worldwide production scale up. The TF conductors are the first ITER components to be mass produced and are more than 50% complete. During its life time, the CS coil will have to sustain several tens of thousands of electromagnetic (EM) cycles to high current and field conditions, way beyond anything a large Nb 3 Sn coil has ever experienced. Following a comprehensive R&D program, a technical solution has been found for the CS conductor, which ensures stable performance versus EM and thermal cycling. Productions of PF, CC and busbar conductors are also underway. After an introduction to the ITER project and magnet system, we describe the ITER conductor procurements and the Quality Assurance/Quality Control programs that have been implemented to ensure production uniformity across numerous suppliers. Then, we provide examples of technical challenges that have been encountered and we present a status of ITER conductor production worldwide.

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Section: Jacket Sectionsmentioning

confidence: 99%

Challenges and status of ITER conductor production

Devred

Backbier

Bessette

et al. 2014

Supercond. Sci. Technol.

177

118

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“…ITER IO requires that the elongation (EL) shall be over 20%. It is found that the EL after the cold work and long-term AT is rather sensitive to its chemical composition thus it is used as the key parameter for monitoring conductor jacket production [9].…”

Section: Mechanical Tests On the Iter Tf Conductor Jacket Materialsmentioning

confidence: 99%

Mechanical property tests on structural materials for ITER magnet system at low temperatures in China

Huang¹,

Huang²,

Li³

2014

AIP Conference Proceedings

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Abstract. High field superconducting magnets need strong non-superconducting components for structural reinforcement. For instance, the ITER magnet system (MS) consists of cable-in-conduit conductor, coil case, magnet support, and insulating materials. Investigation of mechanical properties at magnet operation temperature with specimens machined at the final manufacturing stages of the conductor jacket materials, magnet support material, and insulating materials, even the component of the full-size conductor jacket is necessary to establish sound databases for the products. In China, almost all mechanical property tests of structural materials for the ITER MS, including conductor jacket materials of TF coils, PF coils, CCs, case material of CCs, conductor jacket materials of Main Busbars (MB) and Corrector Busbars (CB), material of magnet supports, and insulating materials of CCs have been carried out at the Technical Institute of Physics and Chemistry (TIPC), Chinese Academy of Sciences (CAS). In this paper, the mechanical property test facilities are briefly demonstrated and the mechanical tests on the structural materials for the ITER MS, highlighting test rigs as well as test methods, are presented.

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“…Deformation accumulated during tensile test can induce transformation of -austenite to '-martensite by movement of dislocations through slips [4]. Extensive work has been done to investigate the mechanical behavior of the 316LN SS after compaction and aging treatment [2,5,6]. However, a detailed study on the performance change of the base full-size TF conductor jacket after tensile tests at low temperature is lacking.…”

Section: Introductionmentioning

confidence: 99%