| Citation: | LI Qing, CHENG Ronghui, CONG Peihong, et al. Analysis on manufacturing factors influencing exhaust window cracking of hollow single crystal turbine blade[J]. Journal of Aerospace Power, 2025, 40（11）：20240730 doi: 10.13224/j.cnki.jasp.20240730
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In order to solve the crack failure of the single crystal alloy turbine blade in practical project application, multiple manufacturing factors leading to premature cracking of exhaust windows were summarized. The crack fracture properties were identified by macro and micro observation utilizing video microscope, scanning electron microscope (SEM) and energy spectrum analysis. The results showed that the exhaust window cracks were originated from the partition wall. The groove defect on the partition wall was due to the ceramic core which was not polished before casting. The higher strength of ceramic core had a strong impact on the recrystallization grain of the partition wall, which was related to the excessive casting residual stress. The “groove crack” on the partition wall was resulted from the corrosion liquid attacking the interdendritic region. The difference in surface potential between the dendrite and interdendritic region played a critical role on the surface morphology and corrosion mechanism. Casting flaw on the partition wall was due to the interface reaction between superalloy and ceramic core. The fatigue crack was produced due to lack of auxiliary support during the grinding process of the saw tooth shaped shroud.
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