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Zhao S.X.,CAS Hefei Institutes of Physical Science | Peng L.J.,Advanced Technology and Materials Company ATandM | Li Q.,CAS Hefei Institutes of Physical Science | Wang W.J.,CAS Hefei Institutes of Physical Science | And 8 more authors.
Fusion Engineering and Design

Two forms of axial strain localization of CuCrZr tubes, i.e.; cracking and denting, were observed during the manufacturing of ITER-like mono-block W/Cu components for EAST employing hot isostatic pressing (HIP). Microscopic investigations indicate that the occurrence of axial strain localization correlates to the heavily deformed Cu grains and elongated Cr-rich precipitates as well as highly anisotropic microstructures, which impair the circumferential ductility. Annealing the as-received tubes at 600°C alleviates cracking due to partial recrystallization of Cu grains. However, the annealed tubes are still sensitive to wall thinning (caused by non-uniform polishing or tube bending), which results in denting. Denting may cause bonding flaws at CuCrZr/Cu interfaces and the underlying mechanisms are discussed. To some extent, denting seems do not affect the high heat flux performance of components. In this paper, we demonstrate that testing only the axial mechanical properties is not enough for manufacturers who use HIP or hot radial pressing technologies, especially for those anisotropic tubes. © 2014 Elsevier B.V. Source

Wang W.,CAS Hefei Institutes of Physical Science | Li Q.,CAS Hefei Institutes of Physical Science | Zhao S.,CAS Hefei Institutes of Physical Science | Xu Y.,CAS Hefei Institutes of Physical Science | And 10 more authors.
Fusion Engineering and Design

In the development of EAST actively cooled W/Cu components, the ITER-grade CuCrZr has been chosen as the heat sink material for its good thermomechanics properties. To realize the seal joint of the heat sink, a large number of electron beam welding (EBW) of CuCrZr/CuCrZr or CuCrZr/Inconel625 has been carried out. In the quality control of the W/Cu components, the helium leak detection at thermal condition has been performed on the entire components before delivery. However, in the operation of EAST device some micro leak on the components was detected indicating that the helium leak detection under present standard was unreliable for the quality control. Therefore, the ultrasonic non-destructive testing technique was introduced to exclude the defects. In addition, the welding shrinkage and bending has also been investigated to meet the required tight tolerances for plasma-facing components in vacuum vessel. © 2015 Elsevier B.V. All rights reserved. Source

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