Abstract
The high-cycle fatigue, small crack propagation behavior of an A357-T6 cast aluminum alloy is investigated. Laboratory X-ray micro-computed tomography \((\mu {\text {CT}})\) is used to assist in the manufacturing of two flat fatigue specimens containing subsurface shrinkage pores of different sizes (Pore 1 \(\sqrt{A} = 522\,\mu {\text {m}}\) against Pore 2 \(\sqrt{A} = 280\,\mu {\text {m}}\)). Surface crack monitoring is performed by means of optical microscopy and the cracked specimens are analyzed via scanning electron microscopy and electron backscatter diffraction techniques. The subsurface pores tend to induce intergranular crack nucleation, principally when the grain boundaries are oriented perpendicular to the loading direction. Pore 1 induces a fatigue life reduction of 500.000 cycles when compared to Pore 2. The crystallography is able to influence small crack propagation by slightly decelerating the crack growth rates as well as by altering the crack path topography. Tailoring of the crystallography for improved fatigue resistance requires an investigation of the optimal largest defect to grain size ratio.
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Notes
The longest distance between any two points a particle.
A circle having the same Area as the measured grain \((\varnothing _{A_{eq}}=\sqrt{\frac{4\times Area}{\pi }}).\)
The average grain size was calculated using a weighted arithmetic average where the largest grains contribute more to the final average than the smallest.
In this work, ligament is referred as the thin bridge of material standing between the specimen free surface and the subsurface pores.
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Acknowledgments
Authors thank the French National Research Agency (ANR) for the funding of this Project: “Influence des DEfauts de Fonderie sur la Fatigue des Alliages Aéronautiques” (IDEFFAAR ANR-10-RMNP-0016).
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Serrano-Munoz, I., Dancette, S., Verdu, C. et al. Influence of Pore Size and Crystallography on the Small Crack HCF Behavior of an A357-T6 Cast Aluminum Alloy. Metall Mater Trans A 51, 1416–1427 (2020). https://doi.org/10.1007/s11661-019-05590-6
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DOI: https://doi.org/10.1007/s11661-019-05590-6