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Compatibility of Ferritic/Martensitic Steel T91 With Flowing LBE Containing 10−7 Mass% Dissolved Oxygen at 450 and 550°C

[+] Author Affiliations
Valentyn Tsisar, Carsten Schroer, Olaf Wedemeyer, Aleksandr Skrypnik, Jürgen Konys

Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen, Germany

Paper No. ICONE22-30399, pp. V003T05A016; 10 pages
  • 2014 22nd International Conference on Nuclear Engineering
  • Volume 3: Next Generation Reactors and Advanced Reactors; Nuclear Safety and Security
  • Prague, Czech Republic, July 7–11, 2014
  • Conference Sponsors: Nuclear Engineering Division
  • ISBN: 978-0-7918-4593-6
  • Copyright © 2014 by ASME


Corrosion behavior of ferritic/martensitic (F/M) steel T91 with 9 % nominal chromium content was investigated in flowing (2 m/s) Pb-Bi eutectic (LBE) with 10−7 mass% dissolved oxygen at 450 and 550°C for up to 8766 and 2011 h, respectively. The corrosion process and material loss were analyzed. The steel generally shows oxidation consisting of the formation of an Fe-Cr spinel layer. Oxidation resulted in metal recession which does not exceed ∼ 10 μm after 8766 h at 450°C and ∼15 μm after 2011 h at 550°C. Local liquid-metal attack in the form of pits occurs at both temperatures. At 450°C, remarkable liquid-metal attack is observed after 5015 h, while, at 550°C, it is found already after 1007 h. The maximum depth of local attack reaches 960 μm after 8766 h at 450°C, and 190 μm after 1007 h at 550°C.

The obtained results are compared with previous experiments at similar testing conditions, except for a higher oxygen concentration of 10−6 mass%.

Copyright © 2014 by ASME



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