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Study of optimum composition of extra high purity Ni-Cr-W-Si alloy for advanced reprocessing plant

次世代再処理施設材料用超高純度Cr-W-Si系Ni基合金の組成最適化の研究

井岡 郁夫; 鈴木 潤; 木内 清; 中山 準平*

Ioka, Ikuo; Suzuki, Jun; Kiuchi, Kiyoshi; Nakayama, Jumpei*

次世代再処理施設の高酸化電位の耐硝酸性環境への適用を念頭にして高Cr-W-Si系Ni基合金組成の最適化を進めている。当該Ni基合金は、高酸化電位において現行ステンレス鋼の課題である過不働態が生じ難い優れた耐食性を有する。また、コールドクルーシブル誘導溶解と電子ビーム溶解を組合せた超高純度溶製技術(EHP)の適用により、溶融割れが生じず可塑性材が得られている。しかし、シリサイド生成能が高く、実用化上、熱間加工や溶接上の技術的制約が大きい。耐食性を損なわずに、それらの特性が良好な組成範囲を選定するため、SiとWの含有量を変えたEHP試験材を作製した。試験材の高温高速引張試験、及び耐食性や溶接施工性能の評価試験を実施して、最適組成範囲を検討した。

Optimization of composition for high Cr-W-Si Ni base alloy has been studied to apply to a nitric acid with high oxidation-reduction potential of advanced reprocessing plants. The corrosion resistance of the Ni base alloy is superior to that of conventional stainless steels. In addition, The Ni base alloy has an excellent resistance of weld crack and ability of plastic deformation caused by extra high purity (EHP) refining technology. However, the Ni base alloy has a technical limitation in hot working and welding for practical use. Several Ni base EHP alloys with different content of Si and W were manufactured to choose an optimum composition range without losing corrosion resistance. High strain rate tensile tests at high temperature, corrosion tests and weldability tests were carried out to examine the optimum composition range of Ni base EHP alloy.

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