Benchmarking of Mechanical Test Facilities Related to ITER CICC Steel Jackets

Vostner, A.; Pong, Ian; Bessette, D.; Devred, A.; Sgobba, S.; Jung, A.; Weiss, K.P.; Jewell, M. C.; Liu, S.; Wang, Yu; Boutboul, T.; Hamada, K.; Park, S.; Tronza, V.; Walsh, R. P.

doi:10.1109/tasc.2013.2243895

Cited by 13 publications

(8 citation statements)

References 10 publications

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“…The PF5 copper dummy was delivered (in 3 sections) to the ITER site on 3 June 2013; this was the very first delivery of a component to ITER. Let us note that the PF jacket sections and the CS jacket sections call for similar mechanical tests at cryogenic temperatures [98,[126][127], as well as similar PAUT and ECT inspections. The PF conductor production relies on the same jacketing facilities as the TF conductors, with dedicated welding stations and sturdier compaction machines.…”

Section: Pf Conductor Productionmentioning

confidence: 95%

“…The measurements are carried out on samples of standardized geometry that have been prepared to be representative of the material state during coil operation, including the cold work that is generated during compaction, spooling, straightening and winding, and the ageing due to Nb 3 Sn heat treatment. For TF, the samples must be cut by electrical discharge machining or water jet from a jacket section which has been compacted to final conductor dimension, stretched 2.5% at room temperature and heat treated at 650 °C for 200 hours in an atmosphere of inert gas or vacuum [98]. For TF jacket sections, the temperature/duration of the Nb 3 Sn heat treatment are sufficient to produce some limited grain boundary sensitization.…”

Section: Jacket Sectionsmentioning

confidence: 99%

“…For TF, the standardization procedure to be applied to the jacket sections from which the mechanical samples are taken include: (1) compaction (by diameter reduction) to final dimensions, (2) stretching by 2.5% to mimic bending and straightening processes as experienced during coil winding and (3) heat treatment for 200 h at 650 • C in Argon or vacuum to mimic the reaction heat treatment of Nb 3 Sn. The sub-size samples must be cut out of the jacket section by water jet or electrical discharge machining [114].…”

Section: Production Statusmentioning

confidence: 99%

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Challenges and status of ITER conductor production

Devred

Backbier

Bessette

et al. 2014

Supercond. Sci. Technol.

168

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: Pf Conductor Productionmentioning

confidence: 95%

Section: Jacket Sectionsmentioning

confidence: 99%

Section: Production Statusmentioning

confidence: 99%

See 1 more Smart Citation

Challenges and status of ITER conductor production

Devred

Backbier

Bessette

et al. 2014

Supercond. Sci. Technol.

168

118

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“…34%. The slight tendency of getting lower cryogenic EL values has been ascribed to larger variation of material properties and non-homogeneity of the thickness around the perimeter [6]. …”

Section: Mechanical Tests On the Iter Tf Conductor Jacket Materialsmentioning

confidence: 99%

“…Before the mechanical test performance, the DA is required to qualify laboratories to confirm that all the tests meet the specifications. The TIPC has been qualified through cross-check tests with KIT [6] and it is a unique qualified laboratory in China.…”

Section: Introductionmentioning

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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Mechanical Properties and Martensitic Transformation Behavior of 316LN Stainless Steel Under Cryogenic Deformation

Li,

Zhang,

et al. 2024

steel research int.

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Digital image correlation (DIC) technology can capture strain anomalies and predict crack initiation providing early warning of material failure. Herein, DIC technique is used to calculate the full‐field strain by analyzing the grayscale patterns of speckle images during the tensile process. This allowed for an analysis of the microstructure evolution of the 316LN austenitic stainless steel (SS) at cryogenic temperatures. Deformation behavior of the 316LN SS at cryogenic temperatures is further analyzed using electron backscatter diffraction technology and transmission electron microscopy. Based on the strain field obtained by the DIC technique, a comprehensive analysis of the martensite volume fraction at different strains can be conducted. The results show that the strain localization under cryogenic deformation is related to martensitic transformation, while the random distribution of slip bands aligns with local strain peak values. Notably, fracture under cryogenic deformation occurs in regions where the strain field reaches its peak, rather than at locations with the maximum strain value.

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Benchmarking of Mechanical Test Facilities Related to ITER CICC Steel Jackets

Cited by 13 publications

References 10 publications

Challenges and status of ITER conductor production

Challenges and status of ITER conductor production

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

Mechanical Properties and Martensitic Transformation Behavior of 316LN Stainless Steel Under Cryogenic Deformation

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