量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum Science and Technology.
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Pure tungsten plates with three kinds of manufacturing processes, i.e., ITER-Grade tungsten, cross-rolledtungsten with a moderate rolling ratio and another cross-rolled tungsten with a high rolling ratio, were evaluatedby the Vickers hardness test, tensile test at room temperature and 500 °C, and micro pillar test. The Vickershardness test results showed that the hardness value of all types of the tungsten plates was 410–430 Hv and nosignificant data dispersion was identified. However, the tensile test showed comparably large data dispersion,which was particularly drastic at room temperature. In parallel, to determine the effect of the specimen cutlocation thorough the plate thickness direction (S-Direction), micro pillar tests were conducted. Although therewere some data dispersion, test results showed plastic deformation and no marked effect of the cut location wasidentified. It is therefore believed that the specimen cut location did not affect the data dispersion identified inthe tensile test. Alternatively, the probable explanation for such large dispersion is partial detachment of thesurface bulk structure. Such specific microstructure can make crack paths more complicated, resulting in thedata dispersion。
Mechanical properties of three kinds of ITER-Grade pure tungsten with different manufacturing proces
