Fabrication of W/FMS joint mock-ups using a hot isostatic pressing |
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| Affiliation: | 1. Korea Atomic Energy Research Institute, 989-111 Daedeokdearo, Yuseong, Daejeon 305-353, Republic of Korea;2. National Fusion Research Institute, 169-148 Gwahangno, Yuseong, Daejeon 305-806, Republic of Korea;1. Scientific Technical Center SINTEZ, D.V. Efremov Institute, 196641 St. Petersburg, Russia;2. I.I. Polzunov Scientific & Development Association on Research and Design of Power Equipment, 191167 St. Petersburg, Russia;1. Korea Atomic Energy Research Institute, Daejeon, Republic of Korea;2. National Fusion Research Institute, Daejeon, Republic of Korea;1. Kyoto University, Kyotodaigaku-Katsura, Kyoto, Japan;2. University of California, Los Angeles, USA;3. National Institute for Fusion Science, Toki, Gifu, Japan |
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| Abstract: | Blocks of tungsten and ferritic–martensitic steel (FMS) were joined without any interfacial defects or cracks. For the joining, two times of a hot isostatic pressing (HIP) were performed. The first HIP (900 °C, 100 MPa, 1.5 h) facilitates the diffusion bonding between W and FMS. The second HIP (750 °C, 70 MPa, 2 h) corresponds to a tempering process to retain the mechanical properties of the FMS. As an interlayer material, titanium foil that can mitigate the thermal expansion difference between W and FMS was used. In addition, a molybdenum foil was inserted to prevent an unwanted bonding of W to a canning material. The lateral cracks in W plates, which were usually observed in the case of a conventional HIP process, were not observed when the molybdenum separator was used. W/FMS joint mock-ups with a dimension of 50 mm × 50 mm × 32 mm (T) were successfully fabricated. The shear strength of the joints was 89 MPa on average. |
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| Keywords: | First wall fabrication Tungsten Ferritic–martensitic steel Hot isostatic pressing |
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