以我国最常用的压力容器用 Q345R 钢为研究对象，进行了冲击和断裂韧性试验；收集整理了国际标准中应用广泛的断裂韧度经验关系式，结合实测的材料性能数据，对这些关系式用于估算 Q345R 钢在转变温度区内断裂韧度的准确性进行了对比分析。结果表明：Sailors-Corten 及Wallin 关系式对断裂韧度的预测结果与实测的结果符合性最好，在转变温度区内，可用于估计Q345R 钢的断裂韧度；在实测材料性能数据的基础上，修订建立了适用于 Q345R 钢的冲击功与断裂韧度的经验关系式。
The most commonly used pressure vessel steel Q345R in China was investigated by means of the impact test and fracture toughness test.The widely used empirical correlations of fracture toughness in the international standards were collected.Combining with the experimental data of material properties,the accuracy of these correlations used to estimate the fracture toughness in the transition temperature range of Q345R steel was analyzed.The results show that the Sailors-Corten and Wallin empirical correlations have good agreement with the measured fracture toughness and can be used to estimate the fracture toughness of Q345R steel during the transition temperature range.Furthermore,the specific correlation between impact energy and fracture toughness for Q345R steel was established based on the measured data of material properties.
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