Comparison of K-doped and pure cold-rolled tungsten sheets: Microstructure restoration in different temperature regimes

P. Lied, W. Pantleon, C. Bonnekoh, M. Dürrschnabel, Ch. Bienert, A. Hoffmann, J. Reiser, M. Rieth

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


For tungsten in divertor parts of future fusion reactors, a fine-grained microstructure is preferred to reduce its brittle-to-ductile transition temperature and minimize cracking events due to cyclic thermal and mechanical loading. In our ongoing study on tungsten sheets with different degree of deformation by warm- and cold-rolling, the potential of potassium-doping to stabilize the microstructure at high operation temperatures is assessed. Successful production of technically pure and equivalently rolled potassium-doped tungsten sheets up to very high logarithmic strains of 4.6 was already shown in the past with in-depth analysis of the evolution of microstructure and mechanical properties after rolling steps. Our current study investigates the microstructure changes in the same material batch by recovery, recrystallization and grain growth in temperature regimes between 600 °C and 2400 °C. Annealing studies with subsequent microhardness and SEM analysis reveal increased retardation of recrystallization in potassium-doped tungsten with higher rolling strain, but abnormal grain growth at high temperatures is also increased. However, potassium-doped tungsten with low rolling strain shows promising results with much less grain growth than its pure tungsten counterpart.
Original languageEnglish
Title of host publicationProceedings of the 20th Plansee Seminar - International Congerence on Refractory Metals and Hard Materials
EditorsK. Wex, H. Kestler, A. Pilz
Number of pages13
Publication date2022
Publication statusPublished - 2022
Event20th Plansee Seminar - Reutte, Austria
Duration: 30 May 20223 Jun 2022


Conference20th Plansee Seminar


  • Fusion reactor materials
  • K-doped tungsten
  • Extended recovery
  • Recrystallization
  • Grain growth
  • Electron backscatter diffraction
  • Hardness indentation


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