Influence of casting defect and SDAS on the multiaxial fatigue behaviour of A356-T6 alloy including mean stress effect

Houria, Mohamed Iben; Nadot, Y.; Fathallah, Raouf; Roy, Matthew; Maijer, Daan M.

doi:10.1016/j.ijfatigue.2015.05.012

Cited by 117 publications

(84 citation statements)

References 26 publications

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“…For AlSi10Mg, it is well known that the main variable affecting the fatigue limit in the left hand side of the Kitagawa diagram is the dendrite size, which controls the fatigue response [47,48,54]. This is also confirmed in [88,89], where the fatigue life was observed to be proportional to DAS −1/2 .…”

Section: Microstructurementioning

confidence: 64%

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A comparison of fatigue strength sensitivity to defects for materials manufactured by AM or traditional processes

Beretta

Romano

2017

International Journal of Fatigue

468

229

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Section: Microstructurementioning

confidence: 64%

“…For AlSi10Mg, the most common process is a peak hardening to the T6 condition, which ensures an improvement in the fatigue resistance of cast parts (comparing the data in [49,50] to [33,48] for R = 0.1 and to [52] for R = −1 in Tab. 2).…”

Section: Thermal Treatmentmentioning

confidence: 99%

A comparison of fatigue strength sensitivity to defects for materials manufactured by AM or traditional processes

Beretta

Romano

2017

International Journal of Fatigue

468

229

View full text Add to dashboard Cite

“…A step by step method was used, as it is the only way to evaluate the fatigue limit in presence of natural defects. It is however assumed that no significant loading history effect is introduced by the loading steps applied prior to failure, as shown by Roy et al [7] in the case of a A356 cast Al-alloy. In order to plot a Kitagawa-type diagram, the fatigue limit is determined for each specimen after failure according to the following method:…”

Section: Methodsmentioning

confidence: 99%

Influence of as-built surface and heat treatment on the fatigue resistance of Additively Layer Manufacturing (ALM) AlSi10Mg alloy.

et al. 2018

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This work concerns the fatigue resistance of a AlSi10Mg material produced by additive manufacturing, and more precisely the competition between as built manufacturing surface and as-machined surface on the fatigue resistance. Samples were built by a powder-bed process with an EOS-M280 machine using standard in two configurations (0° and 90°) in order to evaluate the impact of building direction on fatigue life. The impact of as-built surface on fatigue behavior is quantified for each specimen configuration. A T6 heat treatment is performed on samples in order to evaluate the impact of microstructure on fatigue behavior. For each configurations, the S-N curves is determined in as-built and T6 materials with a load ratio R= -1. The fracture surfaces are carefully analyzed in order to determine the critical defect size for each sample. A Kitagawa type diagram representing the fatigue limit as a function of the defect size is derived from these measurements. All the results were compared to those obtained in asmachined samples.

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“…Peak‐hardened 7000 series aluminum alloys conventionally used into aerospace industries have currently been attempted for high‐speed railway components, such as sleeper beams, axle boxes, and pantographs . To improve the structural integrity, more attentions should be paid on the higher fatigue resistance of such high‐strength alloys due to welding, casting, and 3D printing . However, defects such as gas pores and hot cracks cannot be completely eliminated by high energy density beam welding despite subjected to optimum processing parameters and suitable filler metals .…”

Section: Introductionmentioning

confidence: 99%

Fatigue behaviors of laser hybrid welded AA7020 due to defects via synchrotron X‐ray microtomography

Song

Ding³

et al. 2019

Fatigue Fract Eng Mat Struct

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Defect or shrinkage is known to have a detrimental effect on the fatigue resistance of casting lightweight alloys and additively manufactured or 3D printed materials. However, very few works focus on the damage mechanism of fusion welded Al alloys due to gas pores or metallurgical defects. This paper performs an investigation on the effect of porosity on the damage evolution of laser hybrid welded 7020‐T651 alloys. The critical pore size comparable with average weld grain was assumed in terms of the population and dimension of micropores. To characterize the coupling effect between gas pores and cracks, an in situ fatigue testing rig was developed to well work at the synchrotron radiation tomography system. Combining synchrotron X‐ray microtomography and fatigue resistance testing, the pore size and location were correlated with the crack initiation and crack growth path but relatively less on the long crack propagation rate. Furthermore, the interaction between the porosity and stress concentration was elucidated by using finite element simulations, which shows that the gas pore appears to be a preferred cracking site especially near the surface.

show abstract

Influence of casting defect and SDAS on the multiaxial fatigue behaviour of A356-T6 alloy including mean stress effect

Cited by 117 publications

References 26 publications

A comparison of fatigue strength sensitivity to defects for materials manufactured by AM or traditional processes

A comparison of fatigue strength sensitivity to defects for materials manufactured by AM or traditional processes

Influence of as-built surface and heat treatment on the fatigue resistance of Additively Layer Manufacturing (ALM) AlSi10Mg alloy.

Fatigue behaviors of laser hybrid welded AA7020 due to defects via synchrotron X‐ray microtomography

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