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枢轴在进行超声波探伤时发现无底波 ,经扫描电镜断口分析确认 ,系枢轴在正火加热时因出现过热而产生的晶间裂纹所致。
Pivot in the ultrasonic flaw detection found no bottom wave, the fracture analysis confirmed by scanning electron microscopy, the Department of the Department of the system is due to overheating of the pivot axis caused by intergranular cracks.