Changkai Wang, Yuting He, Teng Zhang, Tianyu Zhang, Jinhui Fu
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引用次数: 0
Abstract
This paper investigated the corrosion damage and fatigue fracture mechanisms of ZL114A cast aluminum alloy through laboratory pre-corrosion fatigue test conducted under simulated tropical marine humid-hot atmosphere. Additionally, based on the analysis results of surface casting defect equivalence and material damage mechanism, three types of fatigue life degradation models for this cast aluminum alloy after pre-corrosion were proposed. The results show that the primary corrosion damage modes of the material in the laboratory’s accelerated corrosion environment are corrosive pitting and intergranular corrosion because of the enriched Si phase in the grain boundary. The fatigue life of pre-corroded specimens exhibits three stages of degradation characterized by initial decline stage; horizontal stage; secondary decline stage, correlating with increasing corrosion time. The primary factors behind this phenomenon are hydrogen embrittlement and the competing effects of surface casting defects and intergranular corrosion on the initiation of fatigue cracks. The fitting results of the three types of pre-corrosion fatigue life degradation models are better than the traditional models.
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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