| Citation: | LIU Xingyue, LIU Haiyan, ZHANG Xiaojie, et al. High-cycle fatigue strength prediction model of single crystal superalloy considering multi-factor synergy[J]. Journal of Aerospace Power, 2026, 41（5）：20250200 doi: 10.13224/j.cnki.jasp.20250200
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The influences of crystal orientation, temperature field and load parameters on fatigue strength were systematically revealed by carrying out high-cycle fatigue tests of film cooling hole simulants under different primary orientation declination angles (1.5°—7.1°), temperatures (850 ℃ and 980 ℃) and stress ratios (−1, −0.33, 0.1, 0.5, 0.8 and 0.9). Based on the Kitagawa-Takahashi (K-T) diagram framework, combined with the EI-Haddad model and the average stress correction theory, a high-cycle fatigue strength prediction model with multi-factor synergy was constructed. The results showed that the fatigue fractures all presented the characteristics of dissociation-like fractures, and no necking or obvious elongation was observed, and the fatigue cracks mainly originated near the film cooling hole and propagated along the {111} crystallographic slip plane. When the primary orientation declination angle was less than 7.1°, the difference in fatigue strength did not exceed 2%, indicating that the orientation within this threshold range was insensitive. The temperature effect showed a significant attenuation law of high-cycle fatigue strength, and the fatigue strength at 980 ℃ decreased by 12.4% compared with 850 ℃. The constant life curve (2×107 cycles) showed typical convex characteristics: in the low stress ratio region (
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