0.6 M NaCl溶液对SLM-ed AlSi10Mg和A360合金疲劳裂纹扩展行为的影响研究

IF 6.8 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2025-09-30 DOI:10.1016/j.ijfatigue.2025.109314

Hongqian Chen, Xuechong Ren, Xiaodi Wang, Peng Liu

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引用次数: 0

摘要

研究了SLMed-AlSi10Mg和A360合金在空气和0.6 M NaCl溶液环境下的疲劳裂纹扩展行为。考虑到各向异性组织，对SLMed-AlSi10Mg合金进行了三种取向的疲劳裂纹扩展曲线测试。结果表明，当空气中ΔK <； 15 MPa·m1/2和0.6 M NaCl溶液中ΔK <； 11 MPa·m1/2时，SLMed-AlSi10Mg的FCG速率高于A360试样。A360试样在0.6 M NaCl溶液中的FCG速率比在空气中的FCG速率高约一个数量级，这是由于氢辅助脆。然而，SLM试样的FCG速率几乎与固溶环境和裂纹取向无关。断口呈粗、细相间断口，符合疲劳裂纹依次穿过熔融边界和中心的规律。SLMed-AlSi10Mg的FCG速率的低环境敏感性可能是由于含有氢原子的细硅电池在抑制位错迁移率方面具有类似的作用。

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Study on the effect of 0.6 M NaCl solution on fatigue crack growth behavior of SLM-ed AlSi10Mg and A360 alloys

The fatigue crack growth (FCG) behaviors of SLMed-AlSi10Mg and A360 alloy were studied in both air and 0.6 M NaCl solution environments. Considering the anisotropic microstructure the fatigue crack growth curves were tested with three orientations for SLMed-AlSi10Mg. The results indicated that SLMed-AlSi10Mg exhibits higher FCG rates than A360 specimens when ΔK < 15 MPa·m^1/2 in air and ΔK < 11 MPa·m^1/2 in 0.6 M NaCl solution. The FCG rates of A360 specimens in 0.6 M NaCl solution was about one order higher than that in air, which was attributed to hydrogen assisted embrittlement. However, the FCG rates of SLM specimens were almost independent on both the solution environment and crack orientations. The fracture surface showed alternate coarse and fine facets, conforming with the fact that fatigue crack went through the molten boundary and center in turn. The low environment sensitivity of FCG rates for SLMed-AlSi10Mg may result from the similar effect of fine Si cells with hydrogen atoms in restraining the dislocation mobility.

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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.