因此，必须及时检测并发现钢轨中存在的裂纹或断裂，确保铁路运输的安全和畅通。
Therefore, rail fractures must be detected in time in order to ensure the safety of rail transportation.
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.
简要地介绍了国外近年来有关钢轨钢的交变形变，疲劳裂纹的萌生，扩展、阻滞等方面的研究试验。
The researches and tests recently performed abroad on cyclic deformation behaviors, crack initiation, crack propagation and crack retardation properties of rail steels are introduced briefly.
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