Use of Small Fatigue Crack Growth Analysis in Predicting the S-N Response of Cast Aluminum Alloys

Caton, M. J.; Jones, J. W.; Allison, J. E.

doi:10.1520/stp13439s

Cited by 13 publications

(4 citation statements)

References 17 publications

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“…According to Wang et al [18], the fatigue life of A356 cast alloys with high porosity is at least one order of magnitude lower than that of those without porosity. Gao et al [19] and Caton et al [20] studied the effects of porosity on the fatigue life of 356 cast alloys. They reported that the pore size and nearest pores to the surface critically influenced the crack initiation and fatigue lifetime.…”

Section: Introductionmentioning

confidence: 99%

Welding of AA6061-T6 Sheets Using High-Strength 4xxx Fillers: Effect of Mg on Mechanical and Fatigue Properties

et al. 2023

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Al-Si-Mg 4xxx filler metals are widely used in aluminum welding owing to their excellent weldability and capability for strength enhancement by heat treatment. However, weld joints with commercial Al-Si ER4043 fillers often exhibit poor strength and fatigue properties. In this study, two novel fillers were designed and prepared by increasing the Mg content in 4xxx filler metals, and the effects of Mg on the mechanical and fatigue properties were studied under as-welded and post-weld heat-treated (PWHT) conditions. AA6061-T6 sheets were used as the base metal and welded by gas metal arc welding. The welding defects were analyzed using X-ray radiography and optical microscopy, and the precipitates in the fusion zones were studied using transmission electron microscopy. The mechanical properties were evaluated using the microhardness, tensile, and fatigue tests. Compared to the reference ER4043 filler, the fillers with increased Mg content produced weld joints with higher microhardness and tensile strength. Joints made with fillers with high Mg contents (0.6–1.4 wt.%) displayed higher fatigue strengths and longer fatigue lives than joints made with the reference filler in both the as-welded and PWHT states. Of the joints studied, joints with the 1.4 wt.% Mg filler exhibited the highest fatigue strength and best fatigue life. The improved mechanical strength and fatigue properties of the aluminum joints were attributed to the enhanced solid-solution strengthening by solute Mg in the as-welded condition and the increased precipitation strengthening by β″ precipitates in the PWHT condition.

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Section: Introductionmentioning

confidence: 99%

Welding of AA6061-T6 Sheets Using High-Strength 4xxx Fillers: Effect of Mg on Mechanical and Fatigue Properties

et al. 2023

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“…4c). The grain size (typically > 500 µm [69]) of the -Al (f.c.c. )-matrix is larger than the incident x-ray beam diameter, which ensures an effectively single-crystalline anisotropic scattering intensity; characteristic streaking is observed for each aging condition [44].…”

Section: Apt Analyses: 3d Nanostructure and Compositionmentioning

confidence: 99%

Temporal evolution of coherent precipitates in an aluminum alloy W319: A correlative anisotropic small angle X-ray scattering, transmission electron microscopy and atom-probe tomography study

et al. 2016

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Small-angle X-ray scattering (SAXS), transmission electron-microscopy (TEM), and atom-probe tomography (APT) are utilized correlatively to study the evolution of nanometer length-scale coherent precipitates in a commercial age-hardenable aluminum alloy, W319. SAXS, with its high-field-of-view and resultant large statistics, perfectly complements TEM and APT at the nanometer length-scale. The combined results provide a comprehensive description of the evolution of the fine precipitates. W319 exhibits two types of fine coherent precipitates on aging namely, ′ and Q, whose temporal evolution has been studied using time-resolved in situ SAXS analyses at three different aging temperatures: 438, 463, and 533 K. Complementary information about the morphology, dimensions and number density of the precipitates were determined from ex situ APT and TEM analyses. Coherent precipitates from a single grain of the -Al-matrix of W319 give rise to an anisotropic SAXS signal, which is subsequently simulated, taking into account the relative orientation of the sample and the crystallographic orientation relationships of the different precipitates. The simulated anisotropic SAXS intensity, based on the results from APT and TEM, is validated utilizing the experimentally obtained 2D SAXS patterns. This permits us to determine the dimensions and number densities of the precipitates from anisotropic SAXS signals, and a complete quantitative analysis of the in situ temporal evolution of the coherent precipitates is performed. Additionally, the present study demonstrates an alternative technique for extracting structural parameters from anisotropic SAXS analyses. The methodology presented herein will be useful for age-hardening analyses of commercial agehardenable Al-based alloys and Ni-based super alloys.

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“…However, the fatigue tests of annealed 0.45% C steel revealed that when R ranged from −1 to 0, small crack growth rates could increase with increasing R . Studies on aluminum alloys 2024‐T3 and W319 also showed that small crack growth rates depended strongly on R , even for positive R values.…”

Section: Introductionmentioning

confidence: 99%

“…This assumption had been proved by researches on near-α titanium alloy IMI 834 at R = 0.1 and 0.7, 12 and duplex microstructure alloy Ti-6Al-2Sn-4Zr-6Mo at R = −0.5, 0.05 and 0.5. 13 However, the fatigue tests of annealed 0.45% C steel revealed that when R ranged from −1 to 0, small crack growth rates could increase with increasing R. 14 Studies on aluminum alloys 2024-T3 15 and W319 16 also showed that small crack growth rates depended strongly on R, even for positive R values.…”

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confidence: 99%

Small fatigue crack growth behavior of titanium alloy TC4 at different stress ratios

Zhu

Jiang

et al. 2018

Fatigue Fract Eng Mat Struct

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In this paper, the small fatigue crack behavior of titanium alloy TC4 at different stress ratios was investigated. Single‐edge‐notch tension specimens were fatigued axially under a nominal maximum stress of 370 MPa at room temperature. Results indicate that fatigue cracks in TC4 initiate from the interface between α and β phases or within α phase. More than 90% of the total fatigue life is consumed in the small crack initiation and growth stages. The crack growth process of TC4 can be divided into three typical stages, ie, microstructurally small crack stage, physically small crack stage, and long crack stage. Although the stress ratio has a significant effect on the total fatigue life and crack initiation life at constant σmax, its effect on crack growth rate is indistinguishable at R = −0.1, 0.1, and 0.3 when crack growth rate is plotted as a function of ∆K.

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Use of Small Fatigue Crack Growth Analysis in Predicting the S-N Response of Cast Aluminum Alloys

Cited by 13 publications

References 17 publications

Welding of AA6061-T6 Sheets Using High-Strength 4xxx Fillers: Effect of Mg on Mechanical and Fatigue Properties

Welding of AA6061-T6 Sheets Using High-Strength 4xxx Fillers: Effect of Mg on Mechanical and Fatigue Properties

Temporal evolution of coherent precipitates in an aluminum alloy W319: A correlative anisotropic small angle X-ray scattering, transmission electron microscopy and atom-probe tomography study

Small fatigue crack growth behavior of titanium alloy TC4 at different stress ratios

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