近几年来,我国各种机车、车辆的车轴都存在着大量疲劳裂纹,严重地威胁着行车安全。从对裂纹成因的分析和实际调查中,发现车轴疲劳裂纹有以下一些特点: In recent years, all kinds of locomotives and vehicles axles in China have a lot of fatigue cracks, which threaten the safety of vehicles seriously. From the analysis of the causes of cracks and the actual survey found that the axle fatigue cracks have the following characteristics: