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酸化物分散強化型フェライト鋼の応力負荷環境下における照射効果の解明とそれに基づく照射下形状不安定性の改善

Radiation effect on oxide-dispersion-strengthened ferritic/martensitic steel under influence of applied stress and improvement of shape stability under irradiation

酒瀬川 英雄  

Sakasegawa, Hideo

JAEAで開発された9Cr-ODS(Oxide Dispersion Strengthened)鋼は優れたクリープ強度を持つ。特に優れたクリープ強度を持つ9Cr-ODS鋼は2相鋼であり、これはマルテンサイト相よりも酸化物粒子がより微細に分散してより高い硬さを持つデルタフェライト相で強化されている。このクリープ挙動は従来の耐熱鋼には観察されない特異なものである。そこで詳しい組織観察に基づいた新たなメカニズムの提案が重要となる。本研究はこの新たなメカニズムを考え、これに基づいたクリープ構成方程式を構築した。また大量製造も視野に入れた材料特性(照射下・非照射下)のさらなる向上を目的とした新たな材料プロセスを提案した。

9Cr-ODS (Oxide Dispersion Strengthened) steels developed by JAEA have superior creep properties. The 9Cr ODS steel displaying an excellent creep property is a dual phase steel. The ODS steel is strengthened by the delta ferrite which has a finer dispersion of oxide particles and shows a higher hardness than the martensite. Its creep behavior is very unique and cannot be interpreted by conventional theories of heat resistant steels. Alternative model of creep mechanism was studied using the results of microstructural observations. Based on the alternative creep mechanism model, a novel creep constitutive equation was formulated. In addition to that, modifications of material processing procedures for improving the creep property under irradiation and unirradiation were performed considering procedures for mass production.

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