Mechanism investigation of anisotropy in impact fatigue property of laser-deposited Ti-6Al-4V

IF 6.8 2区材料科学 Q1 ENGINEERING, MECHANICAL International Journal of Fatigue Pub Date : 2025-03-02 DOI:10.1016/j.ijfatigue.2025.108906

Sihan Zhao , Kangbo Yuan , Boli Li , Yushan Liu , Ruifeng Wang , Minghao Wang , Lin Jing , Weiguo Guo

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Abstract

For structures that are subjected to repeated impacts in service, it is critical to evaluate their impact fatigue life. When we tested the impact fatigue performance of laser metal deposited (LMD) Ti-6Al-4V (Ti64) in different orientations with our newly developed impact fatigue test device, it was found that its impact fatigue life exhibits anisotropy. Therefore, this study carried out systematic impact fatigue tests and microscopic analysis to reveal the source of anisotropy in the impact fatigue life of LMD Ti64. The SEM results show that the fatigue crack propagation process can be divided into two stages: short crack and long crack propagation stages. The impact fatigue crack propagates along the α laths and β columnar grain boundaries at the short crack stage, while directly through columnar grains at the long crack stage. Therefore, the fatigue life at the short crack stage exhibits anisotropy. Another important finding is that the impact fatigue life is significantly shorter than the non-impact fatigue life. This is due to the large localized plastic deformation caused by the impact load, which leads to the early initiation of cracks. This work contributes to revealing the fatigue failure mechanism of LMD Ti64 under repeated impact loading.

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激光沉积Ti-6Al-4V冲击疲劳性能各向异性机理研究

对于在使用中受到反复冲击的结构，对其冲击疲劳寿命进行评估是至关重要的。利用新研制的冲击疲劳试验装置对激光金属沉积Ti-6Al-4V （Ti64）合金不同取向的冲击疲劳性能进行了测试，发现其冲击疲劳寿命表现出各向异性。因此，本研究开展了系统的冲击疲劳试验和微观分析，揭示了LMD Ti64冲击疲劳寿命各向异性的来源。扫描电镜结果表明，疲劳裂纹扩展过程可分为短裂纹扩展阶段和长裂纹扩展阶段。冲击疲劳裂纹在短裂纹阶段沿α条和β柱状晶界扩展，而在长裂纹阶段直接穿过柱状晶界扩展。因此，短裂纹阶段的疲劳寿命表现出各向异性。另一个重要的发现是，冲击疲劳寿命明显短于非冲击疲劳寿命。这是由于冲击载荷引起的较大的局部塑性变形，导致裂纹的早期萌生。本工作有助于揭示LMD Ti64在反复冲击载荷作用下的疲劳破坏机制。

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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.