结果表明：铸铁的石墨形态对疲劳裂纹的萌生及扩展有很大影响。
The results show that graphite morphology of cast irons had great effects on initial fatigue crack and propagation behavior.
确认螺栓机加工不当引起疲劳裂纹的萌生及扩展，加之螺栓受力不均匀加速了疲劳断裂过程。
The results showed that manufacturing defects of the bolt resulted in initiation and propagation of fatigue crack, and uneven loading of the bolt speeded up failure process of fatigue fracture.
电镜分析指出，复相组织疲劳性能高的原因是复相组织中的下贝氏体回火后析出短杆状碳化物，能有效地阻止疲劳裂纹的萌生及扩展。
TEM analysis reveals that the precipitation of short-bar-shaped carbides in lower-bainite can prevent effectively from initiation and propagation of fatigue cracks.
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