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原子力システム高効率化に向けた高耐食性スーパーODS鋼の開発,2; 強度特性とナノ・メゾ組織制御

Super ODS steel R&D towards highly efficient nuclear systems, 2; Mechanical properties and nano-meso structure control

古川 智弘; 大塚 智史; 井上 賢紀; 奥田 隆成*; 阿部 冨士雄*; 大貫 惣明*; 藤澤 敏治*; 木村 晃彦*

Furukawa, Tomohiro; Otsuka, Satoshi; Inoue, Masaki; Okuda, Takanari*; Abe, Fujio*; Onuki, Somei*; Fujisawa, Toshiharu*; Kimura, Akihiko*

計21鋼種のスーパーODS鋼候補材を対象に、高温引張試験,クリープ試験,高温低サイクル疲労試験及び衝撃試験を実施した。耐食性の向上に有効なAlを添加することで高温強度は低下するものの、熱間押出温度の低温化,W添加による固溶強化、さらには高温強度低下を誘発するY-Al複合酸化物の形成抑制効果を狙った活性金属元素の添加等が高温強度の改善・向上に有効であることがわかった。

High temperature tensile, creep, high temperature low cycle fatigue and impact tests have been performed for 21 kinds of Super ODS Candidate (SOC) steel. The mechanical strength of the SOC steels which added aluminum effective in corrosion resistant in LBE/SCW was lower than that of the other steel which did not add aluminum. However, it turned out that low temperature extrusion, addition of tungsten into the steel, addition of the active metal elements such as hafnium and zirconium are effective in an improvement of high temperature mechanical strength.

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