Engineering Failure of Single Crystal Blades Based on Failure Cases

Two main failure modes of single crystal blades caused by stress concentration and metallurgical defects were discussed, and then the solution to these failures were put forward. It is assumed that the room-temperature fatigue failure of single crystal blades is sensitive to stress concentration, so the effect of stress concentration on vibration fatigue failure of single crystal blades should be emphasized in design; room-temperature vibration fatigue testing methods should be optimized and proper high-temperature vibration testing methods should be established for single crystal blades. Recrystallization and small angle grain boundaries have a significant influence on the failure and pass percentage of single crystal blades. Optimal process and reasonable acceptance standards should be applied in engineering application.