表面裂纹萌生原因是拉杆在腐蚀性高炉煤气粉尘和轴向拉伸等工作应力的综合作用下，形成的应力腐蚀裂纹。
The initiation of the cracks was caused by stress corrosion resulting from the co-effect of the corrosive gas dust and the axial tensile stress.
对全部轧辊检查表明，轧辊表面有麻点、小块剥落等制造缺陷，由此而萌生裂纹。
By checking the whole rolling mill. the author found such manufacture defects as pits and small drop-cuts on the surface of rolls which cause cracks.
在靠近钢轨表面一定的深度内，裂纹萌生后基本上沿着塑性流变的方向向钢轨内部斜向下扩展。
Most of the cracks would propagate along the direction of plastic flow into the inside of the rail.
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