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Material properties and their influence on the behaviour of tungsten as plasma facing material

M. Wirtz, I. Uytdenhouwen, V. Barabash, F. Escourbiac, T. Hirai, J. Linke, Th. Loewenhoff, S. Panayotis, G. Pintsuk2017年被引用 60Nuclear FusionIF 3出版社

With the aim of a possible improvement of the material specification for tungsten, five different tungsten products by different companies and by different production technologies (forging and rolling) are subject to a materials characterization program. Tungsten produced by forging results in an uniaxial elongated grain shape while rolled products have a plate like grain shape which has an influence on the mechanical properties of the material. The materials were investigated with respect to the following parameters: hardness measurements, microstructural investigations, tensile tests and recrystallisation sensitivity tests at 3 different temperatures. The obtained results show that different production processes have an influence on the resulting anisotropic microstructure and the related material properties of tungsten in the as-received state. Additionally, the recrystallization sensitivity varies between the different products, what could be a result of the different production processes. Additionally, two tungsten products were exposed to thermal shocks. The obtained results show that the improved recrystallisation behaviour has no major impact on the thermal shock performance.

日本語訳

タングステンの材料仕様改善の可能性を目的として、異なる企業による5種類のタングステン製品が、異なる製造技術(鍛造および圧延)により材料特性評価の対象となった。鍛造により製造されたタングステンは一軸方向の粒形状を示す一方、圧延製品は板状の粒形状を示し、これが材料の機械的特性に影響を及ぼす。材料は以下のパラメータに関して調査された:硬さ測定、微細組織観察、引張試験、および3つの異なる温度での再結晶感受性試験。得られた結果は、異なる製造プロセスが、製造ままの状態のタングステンにおける異方性微細組織と関連する材料特性に影響を及ぼすことを示している。さらに、再結晶感受性は製品間で異なり、これは異なる製造プロセスの結果である可能性がある。さらに、2種類のタングステン製品が熱衝撃に曝された。得られた結果は、改善された再結晶挙動が熱衝撃性能に大きな影響を及ぼさないことを示している。

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