Improvement of impact properties of tungsten by potassium doping

Shuhei Nogami, Shotaro Watanabe, Jens Reiser, Michael Rieth, Sven Sickinger, Akira Hasegawa

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Low temperature brittleness and high ductile-to-brittle transition temperature (DBTT) are potential drawbacks related to the mechanical properties of tungsten (W) for divertor application in fusion reactors. To improve the mechanical properties of W, potassium (K) doping has been applied as a dispersion-strengthening method. In this paper, the effects of K-doping on the Charpy impact properties of W plate fabricated by powder metallurgy and hot rolling in the as-received condition were investigated. In addition, the correlation among the impact properties, tensile properties, and grain structure and the advantages of K-doped W for divertor application of fusion reactor were discussed.

Original languageEnglish
Pages (from-to)48-61
Number of pages14
JournalFusion Engineering and Design
Volume140
DOIs
Publication statusPublished - 2019 Mar

Keywords

  • Charpy impact property
  • Dispersion strengthening
  • Grain refining
  • Hall-Petch law
  • Potassium doping
  • Tungsten

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Mechanical Engineering

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