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通过示波冲击试验，采用预制疲劳裂纹的半尺寸Ｃｈａｒｐｙ试样及标准Ｃｈａｒｐｙ试样评定了核压力容器用Ａ５０８ＣＬ３钢的动态断裂韧性，研究了试样尺寸对动态断裂韧性的温度转变特性的影响．研究结果表明，半Ｃｈａｒｐｙ尺寸试样在低温下较Ｃｈａｒｐｙ试样过高地估计了Ａ５０８ＣＬ３钢的动态断裂韧性，而在上平台温度以上稍低估了Ａ５０８ＣＬ３钢的动态断裂韧性，所评定出的动态断裂韧性的韧／脆转变温度也明显低于标准尺寸Ｃｈａｒｐｙ试样的结果．研究还表明，尽管半Ｃｈａｒｐｙ试样和标准尺寸Ｃｈａｒｐｙ试样评定出的Ａ５０８ＣＬ３钢的动态断裂韧性值有一定误差，确定的动态断裂韧性的韧／脆转变温度值也明显不同，但两种试样确定出的材料模拟中子辐照脆化后的动态断裂韧性的韧／脆转变温度的上升值基本一致．
The dynamic fracture toughness of A508CL3 steel for nuclear pressure vessel was evaluated by means of oscillometric impact test, semi-size Charpy specimen with prefabricated fatigue crack, and standard Charpy specimen. The effect of sample size on the temperature transition characteristics of dynamic fracture toughness was investigated. The results show that the dynamic fracture toughness of A508CL3 steel is estimated by semi-Charpy test at higher temperature than that of Charpy test specimen at low temperature, and the dynamic fracture toughness of A508CL3 steel is slightly underestimated above the temperature of the upper platform. The dynamic fracture toughness The ductile / brittle transition temperature is also significantly lower than that of the standard Charpy test. The study also showed that although the dynamic fracture toughness values of the A508CL3 steels evaluated by the semi-Charpy and the standard Charpy specimens were somewhat incorrect, the ductile / brittle transition temperatures for the dynamic fracture toughness were also significantly different, but both samples The material was determined to simulate the increase of ductile / brittle transition temperature of the dynamic fracture toughness after embrittlement of neutron irradiation.