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Janda, D.

Paper Title Page
MOPEB072 Tracking of RRR Value and Microstructure in High Purity Niobium along the Production Chain from the Ingot to the Finished Cavity 435
 
  • S. Grawunder, F. Schoelz, B. Spaniol
    W.C. Heraeus GmbH, Materials Technology Dept., Hanau
  • R. Grill, W. Simader
    Plansee Metall GmbH, Reutte
  • M. Heilmaier, D. Janda
    TU Darmstadt, Darmstadt
  • W. Singer, X. Singer
    DESY, Hamburg
  
 

The RRR value of high pure Nb is show­ing strong re­la­tions to the in­di­vid­u­al pro­duc­tion steps. Main­ly the dif­fer­ent kind of in­ter­nal stress­es caused by the sev­er­al pro­duc­tion steps are re­sult­ing in the vari­a­tion of the RRR value. This work shows the RRR val­ues along the com­plete pro­duc­tion chain from the molten Ingot till to the fin­ished cav­i­ty. The in­flu­ence of the RRR value caused by stress­es and the re­lease of that stress­es by vac­u­um an­neal­ing is shown.