Self-castellation of tungsten monoblock under high heat flux loading and impact of material properties

Research output: Contribution to journalArticlepeer-review


  • Stephanie Panayotis
  • Takeshi Hirai
  • Valdimir Barabash
  • Alain Durocher
  • F. Escourbiac
  • Jochen Linke
  • Thorsten Loewenhoff
  • Mario Merola
  • Gerald Pintsuk
  • Inge Uytdenhouwen
  • Marius Wirtz

Institutes & Expert groups

  • ITER - Organization - France
  • FZJ - Forschungszentrum Jülich GmbH

Documents & links


In the full-tungsten divertor qualification program at ITER Organization, macro-cracks, so called self-castellation were found in a fraction of tungsten monoblocks during cyclic high heat flux loading at 20MW/m2. The number of monoblocks with macro-cracks varied with the tungsten products used as armour material. In order to understand correlation between the macro-crack appearance and W properties, an activity to characterize W monoblock materials was launched at the IO. The outcome highlighted that the higher the recrystallization resistance, the lower the number of cracks detected during high heat flux tests. Thermo-mechanical finite element modelling demonstrated that the maximum surface temperature ranges from 1800 °C to 2200 °C and in this range recrystallization of tungsten occurred. Furthermore, it indicated that loss of strength due to recrystallization is responsible for the development of macro-cracks in the tungsten monoblock.


Original languageEnglish
Pages (from-to)1-5
JournalNuclear Materials and Energy
Publication statusPublished - 27 Dec 2016


  • Fracture, Tungsten, ITER, high heat flux, Divertor, recrystallization

ID: 2705714