No fatigue striations was observed.

没有观察到疲劳辉纹。

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Crack spreading area and transient breaking are observed, typical fatigue striations, fatigue steps and secondary cracks are observed on some of the fractures.

微观上在少数油管断口中观察到了典型的疲劳辉纹，在很多断口上观察到了疲劳台阶和二次裂纹。

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The correlative nature is revealed between the morphology and orientation of the striations on fatigue fracture surfaces.

疲劳辉纹的形貌特征和位向有一定的相关性。

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