Fatigue properties of AlSi10Mg produced by Additive Layer Manufacturing

Ngnekou, Julius N. Domfang; Nadot, Y.; Hénaff, Gilbert; Nicolaï, J.; Kan, Wen Hao; Cairney, Julie M.; Ridosz, Lionel

doi:10.1016/j.ijfatigue.2018.09.029

Cited by 100 publications

(44 citation statements)

References 42 publications

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“…Hence, it is of upmost importance to investigate and understand the fracture mechanisms and fatigue characteristics, to assess properly, as well as safely the material qualifications. It is crucial to take account of the interaction between the microstructure, internal defects, and fatigue resistance [9,10].…”

Section: Introductionmentioning

confidence: 99%

Effect of HIP Treatment on Microstructure and Fatigue Strength of Selectively Laser Melted AlSi10Mg

Schneller

Leitner

Springer

et al. 2019

JMMP

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This study shows the effect of hot isostatic pressing (HIP) on the porosity and the microstructure, as well as the corresponding fatigue strength of selectively-laser-melted (SLM) AlSi10Mg structures. To eliminate the influence of the as-built surface, all specimens are machined and exhibit a polished surface. To highlight the effect of the HIP treatment, the HIP specimens are compared to a test series without any post-treatment. The fatigue characteristic is evaluated by tension-compression high cycle fatigue tests under a load stress ratio of R = −1. The influence of HIP on the microstructural characteristics is investigated by utilizing scanning electron microscopy of micrographs of selected samples. In order to study the failure mechanism and the fatigue crack origin, a fracture surface analysis is carried out. It is found that, due to the HIP process and subsequent annealing, there is a beneficial effect on the microstructure regarding the fatigue crack propagation, such as Fe-rich precipitates and silicon agglomerations. This leads, combined with a significant reduction of global porosity and a decrease of micro pore sizes, to an improved fatigue resistance for the HIPed condition compared to the other test series within this study.

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Section: Introductionmentioning

confidence: 99%

Effect of HIP Treatment on Microstructure and Fatigue Strength of Selectively Laser Melted AlSi10Mg

Schneller

Leitner

Springer

et al. 2019

JMMP

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“…Among Al alloys, the most widely used and investigated is AlSi10Mg alloy, that shows interesting mechanical properties, in both as-fabricated and heat treated conditions [21][22][23][24][25][26], as well as good corrosion resistance [27][28][29]. Since during their life many parts undergo cycling loading conditions, several authors investigated also the fatigue behavior of this alloy in various conditions, evaluating the effect of fabrication direction or laser scanning strategy [26,[30][31][32]. AM products, in Al alloys as well as in other metals, can suffer from defects like porosity, residual stress and poor finishing that can negatively affect their performance [33][34].…”

Section: Introductionmentioning

confidence: 99%

Evaluation on the fatigue behavior of sand-blasted AlSi10Mg obtained by DMLS

Pola

Battini

Tocci

et al. 2019

Frattura Ed Integrità Strutturale

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Fatigue tests were performed on sand-blasted AlSi10Mg samples produced by Direct Metal Laser Sintering (DMLS) of powders. The effect of sand-blasting on surface properties was evaluated by roughness and residual stresses measurements, together with morphological analysis, in comparison with asfabricated condition. An evident improvement of surface finishing was observed after sand-blasting, which also lead to the presence of compressive residual stress on the external surface of samples, as revealed by XRD measurements. Furthermore, defects analysis allowed the identification of a uniform distribution of porosities in the cross section whereas larger porosities seem more abundant close to the surface. It was found that the tested material exhibits good fatigue resistance, supporting the positive role of sand-blasting as a simple post-processing treatment. Superficial defects are the preferential crack initiation sites, as demonstrated by SEM analysis of fracture surfaces.

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“…Both productions were submitted to stress relaxation heat treatments. P2 bars were heat treated during 1 h at 210°C whereas P1 production was maintained at 300 °C during 2 h. At the end of these heat treatments, both productions respect the standard NF EN 1706:2010, exhibiting the same chemical composition given in Table 1 [13]. P2 production contains flaws in the form of pores that lead to 2.25 % of porosity, while P1 bars are 0.89 % porous.…”

Section: Sample Manufacturingmentioning

confidence: 99%

Effects of additive manufacturing on the dynamic response of AlSi10Mg to laser shock loading

Laurençon

Rességuier

Loison

et al. 2019

Materials Science and Engineering: A

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In this study, the dynamic behaviour of light aluminum alloy AlSi10Mg obtained by additive manufacturing was investigated under laser shock loading. Two types of AlSi10Mg specimens were obtained by Selective Laser Melting (SLM) with two sets of building parameters, leading to specific architecture and microstructure compared to classical manufacturing processes. Their dynamic response to laser driven shocks was investigated on the basis of time-resolved measurements of free surface velocity, transverse visualization of shock-induced fragmentation, and post-recovery observations by means of microscopy. The results reveal a significant influence of the building parameters and SLM-inherited defects on both yield strength and spall strength values, as well as a strong dependence of high rate fracture behaviour on building direction of the material, mainly governed by melt pools shape and dissymmetry, with a combination of "interpool" and "intrapool" fracture modes.

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Fatigue properties of AlSi10Mg produced by Additive Layer Manufacturing

Cited by 100 publications

References 42 publications

Effect of HIP Treatment on Microstructure and Fatigue Strength of Selectively Laser Melted AlSi10Mg

Effect of HIP Treatment on Microstructure and Fatigue Strength of Selectively Laser Melted AlSi10Mg

Evaluation on the fatigue behavior of sand-blasted AlSi10Mg obtained by DMLS

Effects of additive manufacturing on the dynamic response of AlSi10Mg to laser shock loading

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