激光冲击强化和喷丸强化提高Ti-6Al-4V燕尾接头的微动疲劳性能

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2025-04-12 DOI:10.1016/j.ijfatigue.2025.108996

Yan Yin , Yibo Shang , Weifeng He , Chen Wang , Liucheng Zhou

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引用次数: 0

摘要

Ti-6Al-4V广泛应用于航空发动机压气机叶片，但其低抗微动疲劳性使其完整性面临挑战。复合处理被认为是一种具有增强机械性能的未来技术。然而，这些尝试仅限于低周疲劳。复合强化对微动疲劳性能的有益提高仍然很突出。研究了激光冲击强化（LSP）和冲击强化（SP）复合处理对微动疲劳的影响。实验结果表明，接触面附近存在较大的残余应力。表面晶粒细化的深度也较大。因此，LSP + SP处理对微动疲劳寿命的强化效果（4.57倍）优于单一LSP处理（3.94倍）或SP处理（2.87倍）。结果表明，LSP + SP可以影响裂纹起裂点的位置和数量，从而提高起裂寿命。残余应力的大深度分布和微动疲劳引起的多轴应力可以缓解应力集中。疲劳条纹间距的统计分析也揭示了LSP + SP对裂纹扩展的延迟作用。这项工作为压气机叶片抗微动疲劳强化工艺的发展提供了有价值的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Improving the fretting fatigue properties of Ti-6Al-4V dovetail joint treated by laser shock peening and shot peening

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Improving the fretting fatigue properties of Ti-6Al-4V dovetail joint treated by laser shock peening and shot peening

Ti-6Al-4V is widely used in aero-engine compressor blades, but its low fretting fatigue resistance makes integrity challenging. Compound treatment has been recognized as a future technology with enhanced mechanical properties. However, these attempts were limited to low-cycle fatigue. The beneficial fretting fatigue performance enhancements through compound strengthening are still prominent. This study investigates the effect of laser shock peening (LSP) and shock peening (SP) compound treatment on fretting fatigue. The experiment results show a large residual stress near the contact surface. Larger depths of surface grain refinement have also been found. Hence, the LSP + SP had the better-strengthened effect (4.57 times) on fretting fatigue life as compared with single LSP (3.94 times) or SP (2.87 times) treatment. The results reveal that LSP + SP can affect the location and number of crack initiation sites, thereby increasing the initiation life. The large depth distribution of residual stresses and the multiaxial stresses induced by fretting fatigue can mitigate stress concentration. The retardation of crack propagation by LSP + SP was also revealed by statistical analysis of fatigue striation spacing. This work provides valuable insights into the development of a strengthening process for compressor blades against fretting fatigue.

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来源期刊

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.