Rapid crack healing and fatigue life extension in single-edge notched pure titanium via electropulsing treatment

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2025-04-03 DOI:10.1016/j.ijfatigue.2025.108967

Shengwei Zhang , Howook Choi , Jingyu Wang , Zhijie Liu , Heung Nam Han , Sung-Tae Hong

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Abstract

This study investigates the efficacy of electropulsing treatment (EPT) in healing a fatigue-induced crack and improving the fatigue resistance of a single-edge notched pure titanium specimen. Targeted fatigue cycles are applied to induce a pre-crack at the notch root. Then, an electric pulse with a density of 88 A/mm² and a duration of 0.4 s is applied to the fatigued specimen. The experiment demonstrates that EPT completely heals the fatigue-induced crack and extends the fatigue life of the specimen to the conditional fatigue limit greater than one million cycles from the original fatigue life around 55,000 cycles. Electric-thermal simulation and microstructure analysis show that the significant enhancement in fatigue life is predominantly driven by the formation of large compressive residual stress, generating due to the inhomogeneous thermal expansion and phase transformation-induced volume change at the notch region. Also, microstructure change during EPT weakens the texture strength and ultimately enhances the ductility of the notch root, further increasing fatigue life. The induced compressive residual stress and enhanced ductility at the notch root effectively inhibit crack initiation and propagation. This study confirms that EPT technique is effective to heal fatigue damage or to prolong the fatigue life of notched pure Ti component.

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单刃缺口纯钛电脉冲快速裂纹愈合及疲劳寿命延长

研究了电脉冲处理（EPT）对纯钛单刃缺口试样疲劳裂纹的修复和抗疲劳性能的改善作用。应用目标疲劳循环在缺口根部诱发预裂纹。然后，对疲劳试样施加密度为88 a /mm2、持续时间为0.4 s的电脉冲。试验结果表明，EPT完全愈合了疲劳裂纹，将试样的疲劳寿命从原来的55000次左右延长到100万次以上的条件疲劳极限。电热模拟和显微组织分析表明，裂纹区非均匀热膨胀和相变引起的体积变化导致了较大的残余压应力的形成，从而显著提高了疲劳寿命。同时，EPT过程中组织的变化使织构强度减弱，最终提高了缺口根部的延展性，进一步提高了疲劳寿命。缺口根部产生的残余压应力和增强的延性有效地抑制了裂纹的萌生和扩展。本研究证实了EPT技术能有效地修复缺口纯钛构件的疲劳损伤或延长其疲劳寿命。

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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.