[3F05-09] Light Water Reactor Materials

[3F09] Correlation between crack growth and corrosion behavior of cobalt-based alloy in simulated PWR primary water

*Takuyo Yamada¹, Takahiro Sasaoka², Takumi Terachi², Yoshiari Kaneshima¹, Kohei Kokutani¹, Koji Arioka¹ (1. INSS, 2. KEPCO)

Keywords:Co-based alloy, Simulated PWR primary water, Crack growth behavior, Corrosion behavior

Correlation between crack growth and corrosion behaviors of Co-based alloy in simulated PWR primary water were investigated at the temperature ranging between 250-320℃ using forged and welded materials. Preferential oxidation near the carbide/Co-matrix boundary was observed in both alloys after the tests. Such as preferential oxidation might be affected to the crack growth behavior of Co-based alloys.