结果表明，焊缝金属中存在的非金属夹杂物，在低应力作用下形成微裂纹成为裂源，加之焊缝组织中存在大量的M A结构群，从而发生焊缝金属在室温下的解理断裂。
The results showed that nonmetallic inclusions in weld seam served as crack initiation site under external bend load, and large amount of m a structure resulted in cleavage fracture of weld seam.
分析结果表明，断裂钢轨化学成分满足标准要求，低倍组织和显微组织正常，断口呈脆性断裂解理特征，断口处氧化严重。
The results show that the chemical composition, macrostructure and microstructure are normal, the fracture appearance is brittle crowbarand, and the fracture was oxygenated severely.
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