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Irradiation effects on reduced activation ferritic/martensitic steels; Tensile, impact, fatigue properties and modelling

低放射化フェライト/マルテンサイト鋼への照射効果; 引張,衝撃,疲労特性及びモデリング

實川 資朗; 鈴木 一彦; 大久保 成彰; 安堂 正己; 芝 清之

Jitsukawa, Shiro; Suzuki, Kazuhiko; Okubo, Nariaki; Ando, Masami; Shiba, Kiyoyuki

400$$^{circ}$$C以下では、しばしば大きな照射硬化と延性及び靭性低下を示すが、この強度特性変化の挙動を的確に評価し、設計法等での対応を行えば、低放射化フェライト鋼のITER-TBMへの利用には問題を十分に少なくできる。また、硬化及び伸びの変化は、照射量に対して飽和傾向を示すため、DEMO装置への適用可能性も期待できる。このために、照射による大きな強度特性変化に対応できる設計手法の開発が必須であること、照射下での低放射化フェライト鋼の巨視的な挙動モデルの構築が鍵となることが指摘できる。ここでは塑性(構成式)と繰返し軟化挙動のモデルについて検討を加える。併せて、微細組織変化の予測への微式的な照射挙動モデルの重要性及び熱処理による特性改善の可能性についても言及する。

Irradiation often causes hardening and reduction of elongation as well as toughness degradation to a considerable degree. Data, however, indicate that these changes remain in manageable ranges for ITER-TBM application. Moreover, the saturation tendency of the changes with neutron dose suggests that some of the reduced activation martensitic steels are feasible even for future DEMO applications. It is also stressed that the development of a design methodology that is compatible with the large irradiation induced changes is essential to enable these applications. Modeling activities for the macroscopic mechanical response are expected to play key roles in design methodology development. Macroscopic models of plasticity (a constitutive equation) and cyclic softening behavior after irradiation are discussed. Significance of models to estimate microstructural changes during irradiation and beneficial effects of the heat treatment for irradiation performance are also introduced.

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パーセンタイル:61.42

分野:Physics, Fluids & Plasmas

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