Recrystallization behavior of hot-rolled pure tungsten and its alloy plates during high-temperature annealing

Kohei Tsuchida, Takeshi Miyazawa, Akira Hasegawa, Shuhei Nogami, Makoto Fukuda

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

We aimed to clarify the behavior of change in the grain structure and hardness of hot-rolled pure W and its alloys plates developed for various properties by holding at high temperature for long and short durations in the absence of irradiation. The isothermal annealing was performed at 1100 °C for 10–3115 h. The isochronous annealing was performed for 1 h in a temperature range of 1100 to 2300 °C. After heat treatment, the grain structure was observed using electron backscatter diffraction (EBSD) and the Vickers hardness was measured in the observed plane. Pure W did not recrystallize by the heat treatment for a short duration of 1 h at 1100 °C, while the recrystallization of pure W progressed during the heat treatment for long duration of 3115 h at 1100 °C. The temperature and duration at which the recrystallization occurs increase because of the dispersion of K bubbles and solid solution of Re. Considering the actual operation period of fusion reactors, a temperature of 1100 °C can result in recrystallization. It is necessary to decrease the maximum operating temperature or to use materials having a high recrystallization temperature by alloying.

Original languageEnglish
Pages (from-to)158-163
Number of pages6
JournalNuclear Materials and Energy
Volume15
DOIs
Publication statusPublished - 2018 May

Keywords

  • Grain structure
  • Recovery
  • Recrystallization
  • Thermal history
  • Tungsten

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Materials Science (miscellaneous)
  • Nuclear Energy and Engineering

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