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Fracture toughness evaluation of heat-affected zone under weld overlay cladding in reactor pressure vessel steel

原子炉圧力容器鋼のクラッド直下に生じる溶接熱影響部の破壊靱性評価

河 侑成; 飛田 徹; 高見澤 悠; 塙 悟史; 西山 裕孝

Ha, Yoosung; Tobita, Toru; Takamizawa, Hisashi; Hanawa, Satoshi; Nishiyama, Yutaka

An evaluation of the fracture toughness of the heat-affected zone (HAZ), which is located under the weld overlay cladding of a reactor pressure vessel (RPV), was performed. Considering inhomogeneous microstructures of the HAZ, 0.4T-C(T) specimens were manufactured from the cladding strips locations, and Mini-C(T) specimens were fabricated from the distanced location as well as under the cladding. The reference temperature (T$$_{o}$$) values of HAZ for both 0.4T-C(T) and Mini-C(T) specimens were significantly lower than that of the base metal at a quarter thickness by 40$$^{circ}$$C$$sim$$60$$^{circ}$$C. Compared to the literature data that indicated fracture toughness at the surface without overlay cladding and base metal of a quarter thickness in a pressure vessel plate, this study concluded that the welding thermal history showed no significant effect on the fracture toughness of the inner surface of RPV steel.

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