基于Master Curve方法的Q345R钢断裂韧性研究

摘要

Tensile test,Charpy impact test and drop-weight test of Q345R steel in the ductile-brittle transi-tion range were carried out.Master Curve method was developed by single-temperature and multiple-tem-perature method respectively,and compared with the empirical equations adopted in ASME,API and BS. Results show that the reference temperature T0 derived from single-temperature and multi-temperature method is basically consistent,and is about -105 ℃.Master Curve can well envelop the fracture tough-ness and temperature curves derived from the empirical equations,and be more economic and flexible than the KIC curve with sufficient conservation.%进行了国产Q345 R钢在韧脆转变区的拉伸试验、夏比冲击试验和落锤试验,分别采用单温度法和多温度法获得1英寸厚CT试样的Master Curve曲线,并和ASME,API以及BS等规范中断裂韧性估算公式进行对比.结果表明,单温度法和多温度法获得的参考温度T0基本一致,大约为-105℃.主曲线法能够很好地包络各种估算公式推断出的断裂韧性与温度关系曲线,并且在足够保守的前提下,比ASME的KIC下包络线更具经济性和灵活性.