Q390钢韧脆转变区冲击吸收功的类主曲线模型

摘要 采用夏比冲击试验、主曲线法思想及冲击吸收功与断裂韧性的经验公式对Q390低合金高强度钢在韧脆转变区冲击吸收功的分布规律进行了研究.通过夏比冲击试验得到的冲击试验特征温度，求得主曲线的参考温度，进而获得Q390钢的主曲线表达式.在考虑冲击试样厚度的影响下，结合最适用于Q390钢的经验公式，最终得到Q390钢韧脆转变区内冲击吸收功的类主曲线分布模型.结果表明，该模型能很好地描述Q390钢韧脆转变区内冲击吸收功、温度以及累计失效概率之间的关系，在一定程度上拓展了主曲线法的应用.
Abstract：The impact energy distribution law of Q390 low-alloy and high-strength steel in transition temperature region was investigated by using the Charpy impact test， the idea of the Master Curve method and the empirical correlations between impact energy and fracture toughness. The Master Curve reference temperature was obtained by the Charpy impact tests. And then the Master Curve expression of Q390 steel was regressed from the Master Curve reference temperature. Besides， considering the influence of the thickness of impact specimen， the impact-energy principle resembling Master Curve distributive model of Q390 steel in transition temperature region was finally acquired by combining the empirical correlation which was most suitable for Q390 steel. The results show that this model fairly describes the relationship among the impact energy， the temperature and the cumulative failure probability in transition temperature region of Q390 steel， and expands the application of the Master Curve method to a certain extent.