5-9 September 2016
Prague Congress Centre
Europe/Prague timezone

P2.185 Characterization of HIP joints of a simplified prototype of ITER NHF First Wall Panel

6 Sep 2016, 14:20
1h 40m
Foyer 2A (2nd floor), 3A (3rd floor) (Prague Congress Centre)

Foyer 2A (2nd floor), 3A (3rd floor)

Prague Congress Centre

5. května 65, Prague, Czech Republic
Board: 185
Poster I. Materials Technology P2 Poster session

Speaker

Inigo Iturriza (Materials and Manufacturing)

Description

The blanket is one of the most critical component of ITER. It is directly exposed to the plasma and acts as shielding of the vacuum vessel from the neutrons and other energetic particles produced in the fusion plasma. Each of the 215 Normal Heat Flux (NHF) panels consists of a shield block and a First Wall (FW) panel. The NHF FW panels consist of a complex bimetallic structure of 316L stainless steel (SS) backing plate and a copper alloy (CuCrZr) heat sink, covered with beryllium armor tiles. Joining of these materials is done by HIP, following the solid state diffusion bonding technique. Under the framework of a R&D roadmap parallel to the manufacturing of the full-scale prototypes of a FW panel of ITER, this work shows the characterization of the joints involving AISI-316L and CuCrZr produced by diffusion bonding by HIP of a simplified 10-fingers prototype of a FW panel. This 10-fingers prototype has been developed by Leading Metal Mechanic Solutions to design proper cutting strategies of the fingers of the FW panels of ITER to mitigate distortions in the final component. Microstructural and mechanical characterization of the raw material and the joints AISI-316L/AISI-316L, AISI-316L/CuCrZr and CuCrZr/CuCrZr is presented. Mechanical tests were performed following ITER recommendations and the results were compared to F4E specifications. Exhaustive microstructural characterization of the interface was performed by Scanning Electron microscopy (SEM), including Energy Dispersive X-ray Spectroscopy (EDS) and Electron Back Scattered Diffraction (EBSD). The strength of the joints was correlated with the quality of the surface preparation before bonding and the presence of foreign oxides at the interface. The phases developed at the interface during HIPping and post-HIP heat treatments were analyzed. Finally, the effect of the manufacturing thermal history of CuCrZr on its microstructural evolution and its mechanical behavior was investigated.

Co-authors

Cristina Escudero (Materials and Manufacturing, Ceit-IK4, San Sebastian, Spain) Fernando Samaniego (Fundación Leading Innova (CT-Innova), Santander, Spain) Ignacio Cobo (Fundación Leading Innova (CT-Innova), Santander, Spain) Inigo Iturriza (Materials and Manufacturing, Ceit-IK4, San Sebastian, Spain) Nerea Ordas (Materials and Manufacturing, Ceit-IK4, San Sebastian, Spain) Samuli Heikkinen (Fusion For Energy (F4E), Barcelona, Spain) Stefano Banetta (Fusion For Energy (F4E), Barcelona, Spain) Tindaro Cicero (Fusion For Energy (F4E), Barcelona, Spain)

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