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TY - CPAPER AU - Mapar, A. AU - Bieler, T.R. AU - Compton, C. AU - Murphy, J.E. AU - Pourboghrat, F. TI - Hydroforming of Large Grain Niobium Tube J2 - Proc. of International Conference on RF Superconductivity (SRF2015), Whistler, BC, Canada, Sept. 13-18, 2015 AB - Currently most of Niobium (Nb) cavities are manufactured from fine grain Nb sheets. As-cast ingots go through a series of steps including forging, milling, rolling, and intermediate annealing, before they are deep-drawn into a half-cell shape and subsequently electron beam welded to make a full cavity. Tube hydroforming, a manufacturing technique where a tube is deformed using a pressurized fluid, is an alternative to the current costly manufacturing process. A whole cavity can be made from a tube using tube hydroforming. This study focuses on deformation of large grain Nb tubes during hydroforming. The crystal orientation of the grains is recorded. The tube is marked with a square-circle-grid which is used to measure the strain after deformation. The deformation of the tube is going to be modeled with crystal plasticity finite element and compared with experiments. This paper only covers the characterization of the tube and the hydroforming process. PB - JACoW CY - Geneva, Switzerland SP - 1171 EP - 1175 KW - niobium KW - cavity KW - experiment KW - vacuum KW - electron DA - 2015/12 PY - 2015 SN - 978-3-95450-178-6 DO - 10.18429/JACoW-SRF2015-THPB040 UR - http://srf2015.vrws.de/papers/thpb040.pdf ER -