Effect of grain orientation and heat treatment on mechanical properties of pure W

Hiroyuki Noto, Shuichi Taniguchi, Hiroaki Kurishita, Satoru Matsuo, Takashi Ukita, Kazutoshi Tokunaga, Akihiko Kimura

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The effect of grain orientation, heat-treatment temperature and test temperature on the mechanical properties of tungsten (W), which vary depending on plastic working and fabrication process, was investigated by mechanical testing of tensile or bending. Heavily worked W samples (1.5-2.0 mm in the final thickness) exhibit degradation of fracture strength due to recrystallization embrittlement after heat-treatment at 1240 °C (temperature of diffusion bonding between W and a candidate material of the Fe base support structure). On the other hand, W samples with lower thickness reduction rates do not suffer degradation of fracture strength after heating up to around 1300 °C, and show somewhat higher fracture strength by heat-treatment below 1300 °C than the samples in the as-received state. The observed behavior is a reflection of recovery of dislocations introduced by plastic working. High temperature tensile testing of ITER grade W with an anisotropic grain structure and S-TUN with an equiaxed grain structure revealed that both W grades exhibit plastic elongation at temperatures higher than 200 °C with essentially the same temperature dependence of yield strength, which is relatively insensitive to grain orientation in the structure at 200-1300 °C.

Original languageEnglish
Pages (from-to)475-479
Number of pages5
JournalJournal of Nuclear Materials
Volume455
Issue number1-3
DOIs
Publication statusPublished - Dec 2014

All Science Journal Classification (ASJC) codes

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

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