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Fracture toughness evaluation of reactor pressure vessel steels by master curve method using Mini-CT specimens

MiniCT試験片を用いたマスターカーブ法による原子炉圧力容器鋼の破壊靱性評価

飛田 徹; 西山 裕孝 ; 大津 拓与; 宇田川 誠; 勝山 仁哉 ; 鬼沢 邦雄 

Tobita, Toru; Nishiyama, Yutaka; Otsu, Takuyo; Udagawa, Makoto; Katsuyama, Jinya; Onizawa, Kunio

不純物含有量,靱性レベルが異なる5種類のA533B class1鋼について、0.16インチから1インチまでの板厚・形状の異なる数種類の試験片(0.16T-CT, PCCv, 0.4T-CT, 1T-CT)を用いて、マスターカーブ法による破壊靱性試験を行った。0.16T-CTは監視試験片の破断片から8個まで採取することができる超小型の試験片である。すべての材料について、0.16TCTを用いても1TCTその他板厚の試験片と同等の破壊靱性参照温度Toを評価することができた。また負荷速度が速いとToが高くなる傾向が見られたが、規格の負荷速度上限及び下限におけるToの差は10度程度であった。

Mini-CT (0.16T-CT) specimens up to eight can be taken from broken halves of surveillance Charpy specimens. We conducted a series of fracture toughness tests based on the Master curve method for several specimen size and shapes, such as 0.16T-CT, pre-cracked Charpy type, 0.4T-CT and 1T-CT specimens, in commercially manufactured 5 kinds of A533B class1 steels with different impurity contents and fracture toughness levels. Reference temperature To of 0.16T-CT specimens was approximately equal to those of 1T-CT and other type of specimens for all materials. We also examined a loading rate effect on TO of Mini-CT specimens for some materials within the specified range in the test method. Higher loading rate gave rise to slightly higher TO. The difference in TO between upper and lower loading rate of the standard was approximately 10$$^{circ}$$C.

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