Superconducting niobium tubes are widely used in high-energy physics particle accelerators, nuclear fusion experimental devices, nuclear magnetic resonance, superconducting generators, superconducting motors, superconducting maglev trains, etc. In particle accelerators in high-energy physics, superconducting niobium tubes are used. The huge magnetic field established by the magnet accelerates and restricts the movement of anions and cations.
Large-scale superconducting niobium tubes can only be produced by conventional extrusion rolling methods. Due to the large surface deformation and uneven deformation in the wall thickness direction during the rolling process, the performance after annealing is unstable. , and the surface finish cannot meet the standard requirements. For this reason, a new process must be developed to meet the performance of the superconducting accelerator. The overall forging permeability of the bar is better by extrusion + forging + turning. After subsequent annealing The consistency of tissue performance is good, meeting the requirements of Fermilab and CERN.
It can be seen from the experimental data curve that the tensile strength and yield strength of the superconducting niobium tube with large diameter and thick wall change significantly when the strength is 630°C x 30min. The overall forging penetration of the niobium tube processed by extrusion, forging, turning and other processing methods is better, and the consistency of the microstructure and properties after the subsequent annealing of the tube is better. The annealing temperature of the superconducting niobium tube is 750°C/30min, the tensile strength is above 150mpa, the yield strength is above 65mpal, the elongation is 50, the 3RRR value is 300, and the grain size is above 6. This experimental conclusion greatly promotes the progress of high-energy physics particles.