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高純度鉄基合金開発に関する研究(2); 高純度鉄基合金材料の作成・極微量分析・特性試験

Research on development of high-purity iron-based alloys (2); Manufacture, analysis of small amount of elements and property tests

安彦 兼次; 高木 清一; 若井 隆純 ; 青砥 紀身 ; 上野 文義  ; 永江 勇二 ; 加藤 章一 ; 斉藤 淳一  

not registered; not registered; Wakai, Takashi; Aoto, Kazumi; Ueno, Fumiyoshi; Nagae, Yuji; Kato, Shoichi; Saito, Junichi

将来の高速炉実用化に向けて、安全性と経済性向上のための構造材料に対する種々の要求を踏まえた高速炉構造の最適材料設計・実用材開発に資するため、超高純度Fe-Cr合金を溶製し、それらの合金の高速炉環境下での試験(高温での機械的特性および溶融Na耐食性試験等)を行った。結果、以下の成果が得られた; (1)従来の合金技術では、Fe中Cr濃度が30%以上の合金は実用不可能とされていたが、超高純度化することによりFe中Cr濃度が60%に達しても、ある程度の引張特性および長時間クリープ特性を具備できる見通しが得られた。 (2)超高純度Fe-Cr合金を用いた実物大コンポーネントの試作を通じて、きわめて良好な製作性を確認し、実用的な構造物の製造見通しを得ることができた。

The structual material of the future Fast Breeder Reactors(FBRs) must be improved to achive some requirements for improvement of safety and economical competitiveness. To prepare the desired data for the structural material development for the future FBRs, some mechanical and chemical tests, i.e. high temterature tensile tests and sodium corrosion tests, of the high-purity Fe-Cr alloys were conducted under the FBR conditions. As a result, following conclusions are obtained; 1) By eliminating the trace elements, high Cr content iron based alloys can be produced. It was clarified that such alloys have good tensile properties and creep strength enough for practical use at elevated temperature. 2) Through the manufacturing of a full size structure using the high purity Fe-50% Cr alloy, it was confirmed that the alloy has good manufacturability enough for practical use."

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