High temperature fatigue behavior of coated and uncoated nickel-based single crystal superalloy DD6: Microstructures evolution, damage mechanisms and lifetime prediction

IF 5.7 2区 材料科学 Q1 ENGINEERING, MECHANICAL International Journal of Fatigue Pub Date : 2024-10-24 DOI:10.1016/j.ijfatigue.2024.108670
Jiaping Li, Xiaochao Jin, Dongxu Li, Jingjing Yang, Xueling Fan
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Abstract

Thermal barrier coatings (TBCs) are widely used to further extend the lifetime of turbine blades by protecting the blades from high temperature corrosion and oxidation. However, the mechanical behavior of turbine blades is obviously affected by the TBCs. In this study, microstructures evolution, damage mechanisms and life prediction of coated and uncoated nickel-based single crystal (NBSX) superalloy DD6 under isothermal fatigue load were investigated at 980 °C. The effects of TBCs on fatigue failure behavior and lifetime of DD6 were addressed. The results showed that the fatigue lifetime reduced with the increase of load. The effect of TBCs on the fatigue lifetime was related to the stress amplitude, as the effect was beneficial at high stress but almost negligible at low stress. Fracture morphologies showed that the cracks more likely initiated and propagated from basal defects for both coated and uncoated DD6, and the microstructure evolution also showed stress amplitude dependence. The crack density of uncoated DD6 increased first and then decreased with the increase of stress amplitude. However, the TBCs reduced the number of cracks that penetrate into the DD6 substrate, and the stress amplitude exerted a significant effect on crack propagation paths. In addition, the rafting behaviors of the DD6 substrate of coated and uncoated samples was compared, and results showed that TBCs could reduce the rafting degree of DD6. Finally, the fatigue lifetime of coated samples was predicted based on the modified Basquin model, and the prediction results fitted well with the experimental results.
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有涂层和无涂层镍基单晶超合金 DD6 的高温疲劳行为:微结构演变、损伤机制和寿命预测
热障涂层(TBC)通过保护叶片免受高温腐蚀和氧化,被广泛用于进一步延长涡轮叶片的使用寿命。然而,涡轮叶片的机械性能显然会受到热障涂层的影响。在本研究中,研究了在 980 °C 等温疲劳载荷下,涂覆和未涂覆镍基单晶 (NBSX) 超合金 DD6 的微观结构演变、损伤机理和寿命预测。研究探讨了 TBC 对 DD6 疲劳失效行为和寿命的影响。结果表明,疲劳寿命随着载荷的增加而缩短。TBC 对疲劳寿命的影响与应力幅值有关,因为在高应力下这种影响是有益的,而在低应力下几乎可以忽略不计。断裂形态显示,有涂层和无涂层 DD6 的裂纹更有可能从基底缺陷开始并扩展,而且微观结构的演变也与应力振幅有关。随着应力振幅的增大,未涂层 DD6 的裂纹密度先增大后减小。然而,TBC 减少了穿透 DD6 基材的裂纹数量,应力振幅对裂纹扩展路径有显著影响。此外,还比较了涂覆和未涂覆样品的 DD6 基底的筏化行为,结果表明 TBC 可降低 DD6 的筏化程度。最后,根据改进的 Basquin 模型预测了涂层样品的疲劳寿命,预测结果与实验结果吻合良好。
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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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