某型航空发动机涡轮叶片叶冠堆焊裂纹,修理时未被荧光渗透探伤有效检出。通过对裂纹性质进行金相分析,证明裂纹是由残余应力引起的延时裂纹,荧光探伤时未开口。针对性的研究采用X射线探伤进行补充检测并优化修理工艺流程增加去应力手段,不仅提高了检测可靠性而且降低了裂纹故障率。 A type of aeroengine turbine blade crown crack welding, repairs were not detected by fluorescence penetrant detection. Through the metallographic analysis of the crack properties, it is proved that the crack is a delayed crack caused by residual stress, and no opening is detected during the fluorescent flaw detection. Targeted research using X-ray inspection to supplement testing and optimize the repair process to increase the stress relief means not only improve the reliability of detection but also reduce the rate of crack failure.