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采用夏比冲击实验和小冲杆实验对2.25Cr-1Mo-0.25V钢厚壁焊接接头热影响区韧性沿焊缝深度方向的分布进行了测试,并使用体视显微镜和扫描电镜对冲击断口进行观察,对裂纹扩展路径进行金相观察。结果表明,热影响区的冲击韧性和断裂韧性沿焊缝深度方向都表现出了“中部区域韧性优于两侧”的特征,冲击裂纹主要沿粗晶区扩展,推测韧性分布的差异有可能是由于不同位置的塑性应变不同造成的,即塑性损伤沿厚度方向的分布差异是导致韧性分布差异的原因。相关结果对评估厚壁焊接构件接头性能和改进制造工艺具有一定参考意义。
The distribution of toughness in the HAZ of 2.25Cr-1Mo-0.25V steel thick-walled welded joints along the weld depth was tested by Charpy impact test and small punch test. The impact fracture was performed by stereomicroscope and scanning electron microscope Observation, the crack propagation path for metallographic observation. The results show that the impact toughness and fracture toughness of the HAZ show the characteristics of “better ductility of the middle part than both sides” along the depth of the weld, and the impact cracks mainly extend along the coarse grain region. The differences of the toughness distribution It may be due to different plastic strain at different locations, that is, the distribution of plastic damage in the thickness direction is the reason of the difference in the distribution of toughness. The related results have certain reference value for evaluating the joint performance of thick-walled welded components and improving the manufacturing process.