高温下 Ni 基单晶膜冷却孔结构的振动疲劳行为和失效机理

IF 5.7 2区 材料科学 Q1 ENGINEERING, MECHANICAL International Journal of Fatigue Pub Date : 2024-10-12 DOI:10.1016/j.ijfatigue.2024.108646
Yujie Zhao, Yixin Qu, Weizhu Yang, Jiawei Wu, Lei Li
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引用次数: 0

摘要

膜冷孔结构对 Ni 基单晶涡轮叶片的振动疲劳性能有很大影响。本研究利用带薄膜冷却孔的板材试样,研究了高温下镍基单晶超合金薄膜冷却孔结构的振动疲劳行为和失效机理。振动疲劳裂纹均起源于试样表面薄膜冷却孔的边缘,宏观裂纹路径为直线路径。在微观尺度上,850 ℃ 时的裂纹路径为之字形路径,但 980 ℃ 时的裂纹路径仍为直线路径。试样的裂纹起始显示了在高温和交变应力的耦合作用下,氧化裂纹在应力集中区域成核。高温下的宏观裂纹扩展方向取决于解析剪应力的应力梯度方向。在微观尺度上,850 ℃时的裂纹扩展是位错滑移爬升机制,而 980 ℃时的裂纹扩展更倾向于只产生位错爬升机制。振动疲劳裂纹具有温度依赖性。高温环境促进了滑移系统的活化和位错迁移率的提高,微观筏状结构促进了裂纹沿具有大量位错的γ相扩展,氧化裂纹促进了氧进入合金基体,从而加速了模式-I裂纹的扩展。
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Vibration fatigue behavior and failure mechanism of Ni-based single-crystal film cooling hole structure under high temperature
Film cooling hole structures significantly influence vibration fatigue performance of Ni-based single crystal turbine blades. This study investigates the vibration fatigue behavior and failure mechanism of film cooling hole structure of Ni-based single crystal superalloy at high temperature by using the plate specimens with film cooling holes. The vibration fatigue cracks are all initiated at the edge of the film cooling hole on specimen surface, and the macroscopic crack path is a straight line path. At the microscopic scale, the crack path at 850 °C is a Zigzag path, but the crack path at 980 °C still shows a straight line path. The crack initiation of the specimen shows the oxidation crack nucleation in the stress concentration area under the coupling effect of high temperature and alternating stress. The macroscopic crack propagation direction at high temperature depends on the stress gradient direction of the resolved shear stress. At the microscopic scale, the crack propagation at 850 °C is the dislocation slip-climb mechanism, and the crack propagation at 980 °C more inclined to produce only the dislocation climb mechanism. The vibration fatigue cracks have the temperature dependence. The high temperature environment promotes the activation of slip system and the enhancement of dislocation mobility, the microscopic raft structure promotes the crack propagation along the γ phase with a large number of dislocations, the oxidation crack promotes the oxygen to enter the alloy matrix, which accelerates the Mode-I crack propagation.
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来源期刊
International Journal of Fatigue
International Journal of Fatigue 工程技术-材料科学:综合
CiteScore
10.70
自引率
21.70%
发文量
619
审稿时长
58 days
期刊介绍: Typical subjects discussed in International Journal of Fatigue address: Novel fatigue testing and characterization methods (new kinds of fatigue tests, critical evaluation of existing methods, in situ measurement of fatigue degradation, non-contact field measurements) Multiaxial fatigue and complex loading effects of materials and structures, exploring state-of-the-art concepts in degradation under cyclic loading Fatigue in the very high cycle regime, including failure mode transitions from surface to subsurface, effects of surface treatment, processing, and loading conditions Modeling (including degradation processes and related driving forces, multiscale/multi-resolution methods, computational hierarchical and concurrent methods for coupled component and material responses, novel methods for notch root analysis, fracture mechanics, damage mechanics, crack growth kinetics, life prediction and durability, and prediction of stochastic fatigue behavior reflecting microstructure and service conditions) Models for early stages of fatigue crack formation and growth that explicitly consider microstructure and relevant materials science aspects Understanding the influence or manufacturing and processing route on fatigue degradation, and embedding this understanding in more predictive schemes for mitigation and design against fatigue Prognosis and damage state awareness (including sensors, monitoring, methodology, interactive control, accelerated methods, data interpretation) Applications of technologies associated with fatigue and their implications for structural integrity and reliability. This includes issues related to design, operation and maintenance, i.e., life cycle engineering Smart materials and structures that can sense and mitigate fatigue degradation Fatigue of devices and structures at small scales, including effects of process route and surfaces/interfaces.
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