高倍下观察断口发现有准解理特征，在裂纹扩展最后阶段有塑性撕裂特征。
According to the observed morphology on the fracture surface, the fracture surface had pseudo-cleavage feature and plastic tearing feature in the last stage of crack growth in high magnification.
通过对管线钢不同温度的落锤撕裂试验和微观断口分析，研究了DWTT试样断口的分层裂纹及其对断裂的影响。
The delamination crack and its effect on the fracture of pipeline steel were investigated by drop-weight tear test(DWTT)at different temperature and micrograph analysis.
断口扫描观察表明，试样破断是由于腐蚀隧洞沿滑移面生长并受到拉伸撕裂所致。
Fractured surface scanning observation showed that the breakage in specimen resulted from the corrosion tunnels generating along slip planes and being torn by tensile stress.
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