分析了某发动机压气机静子叶片叶尖U型槽裂纹生成原因。裂纹断口宏观和微观观察看到裂纹起源于U型槽加工刀痕处,源区有明显放射棱线和台阶,扩展区有清晰疲劳弧线和细密条带,表明裂纹的性质是疲劳开裂。另外,根据缺口对叶片制造材料疲劳强度的敏感性,讨论了疲劳裂纹从加工刀痕处起始的原因。 The reason of the crack in the U-shaped groove of stator blade tip of a compressor was analyzed. Crack fracture macroscopic and microscopic observation shows that the crack originated in the U-shaped groove machining marks, the source area has obvious radiation ridge and step, the expansion zone has a clear fatigue arc and fine strip, indicating that the nature of the crack fatigue cracking. In addition, based on the sensitivity of the notch to the fatigue strength of the blade-making material, the cause of the fatigue crack initiation from the machining cut is discussed.