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通过拉伸、冲击试验研究了预应变量和时效温度对厚壁X80HD2大变形直缝埋弧焊管低温冲击韧性的影响,测定了不同应变时效条件下的夏比冲击吸收能量和剪切断面率,用扫描电镜观察了不同温度下冲击断口形貌。结果表明,随着预应变量的提高和时效温度的增加,夏比冲击吸收能量和剪切断面率逐渐减小,增加预应变量对低温冲击韧性的恶化效果高于提高时效温度;此外,增加预应变量将加大断口分离的倾向性,提高时效温度则对断口分离倾向性的影响不显著;增加预应变量和提高时效温度均使冲击断口发生准解理断裂的倾向增加。
The effects of pre-strain and aging temperature on the low-temperature impact toughness of X80 HD2 large deformation LSAW pipe were studied by tensile and impact tests. The Charpy absorbed energy and shear section rate under different strain-aging conditions were measured. Scanning electron microscopy was used to observe the impact fracture morphology at different temperatures. The results show that with the increase of prestrain and the increase of aging temperature, the Charpy absorbed energy and the shear section rate decrease gradually. Increasing the amount of prestrain increases the impact toughness of low temperature at elevated temperature. In addition, Prestrain will increase fracture propensity, while increasing the aging temperature has no significant effect on fracture propensity. Fracture fracture tendency increases with the increase of prestrain and aging temperature.