Abstract
Based on a system of macro & micro fracture appearance observation, energy spectrum analysis and metallurgical structure inspection, the cause of sample crack of Q345 steel were obtained. The results showed that the specimen occurred fatigue crack under alternating load, the crack source was a line source, the middle area of the fracture was the relatively flat topography and relatively narrow fatigue striations, the rear area of the fracture was the relatively uneven topography and relatively large fatigue striations, and a certain yield occurred at the crack tip.
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