Development of extremely high temperature material property equations and physical property values on austenitic stainless steel

オーステナイトステンレス鋼の超高温材料特性式と物性値の開発

鬼澤 高志  ; 若井 隆純 

Onizawa, Takashi; Wakai, Takashi

シビアアクシデント条件下での構造健全性評価を実施するためには、有限要素解析などの数値解析に使用できる材料特性が必要である。しかし、シビアアクシデント時の構造健全性評価に適用できる超高温まで適用可能な材料特性式はなかった。このため、オーステナイト系ステンレス鋼に対して最高1000Cまでの引張およびクリープ試験を実施し、取得したデータに基づき、最高1000Cまで適用可能な弾塑性応力-ひずみ関係式, クリープ破断関係式, クリープひずみ式を開発した。

In order to evaluate the structural integrity under the severe accident condition, material characteristics which can be used in the numerical analyses, such as finite element analysis, were required. However, there were no material characteristics applicable to the structural integrity assessment at extremely high temperature. Therefore, a series of tensile and creep tests was performed for austenitic stainless steels at extremely high temperature which meets in some kinds of severe accidents of nuclear power plants, namely up to 1000C. Based on the acquired data from the tests, elastoplastic stress-strain equation, creep rupture equation and creep strain equation applicable to the structural analysis at extremely high temperature, up to 1000C were formulated.