Abstract: In view of the typical thermal aging phenomenon of primary coolant pipes during service in CPR1000+ unit, the influence of thermal aging time on dynamic fracture toughness of primary coolant piping materials were investigated by the 55 mm×10 mm×10 mm pre-crack impact (PCVN) sample, combined with 3D digital image correlation (DIC). The dynamic crack growth resistance curves (dynamic J-R curve) of the base metal were obtained based on the dynamic load-displacement curves by the key curve method and load separation method, and then compared with the quasi-static fracture toughness variation tendency, and it is found that, there is an obvious embrittlement in primary pipeline mate-rial after thermal aging.
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2020, Vol. 34 
