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。
Crack spreading area and transient breaking are observed, typical fatigue striations, fatigue steps and secondary cracks are observed on some of the fractures.
实验发现，激光自脉冲调制与行走辉纹产生的激光噪音有本质区别。
The LSPM has been found to be intrinsically different from the laser noise caused by the moving striation.
没有观察到疲劳辉纹。
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