发表刊物：International Journal of Fatigue
关键字：γ′-rich Ni-based single crystal superalloy; [111] crystal orientation; Film cooling hole; Vibration fatigue; Life prediction
摘要：Vibration fatigue is a critical failure mode for high-pressure turbine blades incorporating film-cooling holes (FCHs). A γ′-rich [111]-oriented Ni-based single-crystal superalloy was studied. Under first bending-mode resonance, the [111] orientation shows higher vibration fatigue resistance than the [001] orientation and several [001]-oriented Ni-based single-crystal alloys. This advantage is attributed to activation of only three <111> slip-plane pairs and the reduced γ/γ′ strength differential that promotes γ/γ′ co-deformation. By contrast, FCH-induced stress concentrations alter the local shear-stress field and generate interlaced cleavage steps, while accelerating dislocation transmission across γ/γ′ interfaces and γ′ shearing, leading to a marked reduction in the fatigue strength at different cycle counts. Based on the stress-concentration effect of FCHs, a Line Method-Vibration Fatigue (LM-VF) method is proposed to predict the S–N response of FCH-containing specimens, achieving prediction errors within ±10% and providing substantially higher accuracy than the conventional line method (LM) within the Theory of Critical Distance (TCD) framework.
论文类型：期刊论文
一级学科：材料科学与工程
文献类型：期刊
是否译文：否
发表时间：2026-04-15
收录刊物：SCI、SSCI