High-temperature mechanical properties of AlSi10Mg specimens fabricated by additive manufacturing using selective laser melting technologies (AM-SLM)

Uzan, Naor Elad; Shneck, R.; Yeheskel, O.; Frage, N.

doi:10.1016/j.addma.2018.09.033

Cited by 94 publications

(60 citation statements)

References 29 publications

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“…In the last few years, the use of components produced through additive manufacturing (AM) processes is rapidly growing in many industrial applications. AM parts are currently employed in applications subjected to static loads at room and high temperature [1,2], such as brackets [3], medical devices [4], or heat exchangers [5]; however, their use is still limited for applications subjected to fatigue loads [6,7]. Among the employed alloys, the ones belonging to the Al-Si system are drawing considerable interest thanks to their good mechanical properties and low density.…”

Section: Introductionmentioning

confidence: 99%

VHCF Response up to 109 Cycles of SLM AlSi10Mg Specimens Built in a Vertical Direction

et al. 2019

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It is well-known that many manufacturing parameters affect the quasi-static and the fatigue response of additive manufacturing (AM) parts. In particular, due to the layer-by-layer production, the load orientation, with respect to the building direction, plays a fundamental role for the fatigue response. This paper investigates the fatigue response up to 10 9 cycles (very high cycle fatigue (VHCF)) of selective laser melting (SLM) AlSi10Mg specimens built in a vertical direction. Ultrasonic tension-compression tests (stress ratio of -1) are carried out on as-built Gaussian specimens with a large loaded volume (2300 mm 3 ). Fracture surfaces are investigated with the scanning electron microscope to analyze the defects originating the VHCF failure. Probabilistic S-N curves are estimated and analyzed. Experimental results confirm that the defect size controls the VHCF response, thus highlighting the importance of testing large risk volumes for a reliable assessment of VHCF behavior. The average value of the VHCF strength is close to that of the hourglass specimen tested in the literature. The variability of the VHCF strength is instead significantly larger, due to the scattered size distribution of the defects located near the specimen surface, which is the most critical region for crack initiation.

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Section: Introductionmentioning

confidence: 99%

VHCF Response up to 109 Cycles of SLM AlSi10Mg Specimens Built in a Vertical Direction

et al. 2019

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“…Due to the near eutectic composition and relatively lower thermal expansion coefficient (19.4 × 10 −6 • C −1 , compared to other non Al-Si alloys, such as 2xxx and 7xxx Al alloys), Al-Si alloys are the most frequently used aluminum alloys for SLM [2,26]. Existing literatures on corrosion behaviors of SLM prepared aluminum alloys mainly focus on Si-containing aluminum alloys, such as AlSi10Mg and Al-12Si.…”

Section: In As-built Statementioning

confidence: 99%

Corrosion Behaviors of Selective Laser Melted Aluminum Alloys: A Review

Chen

Zhang

Jia

et al. 2020

Metals

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Selective laser melting (SLM) is an ideal method to directly fabricate products with high geometrical complexity. With low density and good corrosion resistance, aluminum alloys are widely used as important structural materials. Microstructures and mechanical properties of SLMed aluminum alloys have been recently widely studied. Corrosion behavior as a vital concern during the service of SLMed aluminum alloy parts has also drawn many attentions. Previous studies have found that SLM-processed aluminum alloys exhibit better corrosion resistance compared to the casted and wrought counterparts for both Al-Si alloys and high strength 2xxx Al alloys, which is mainly due to the unique microstructure features of SLMed Al alloys. For Al-Si alloys, with different shapes of Si networks, the different building planes show discrepant corrosion behaviors. Owing to the rougher surface with relatively larger numbers of defects, the as-printed surface is vulnerable to corrosion than the polished. Heat treatment has a negative effect on corrosion resistance due to the breakup of Si networks. The microstructure features correlated with the corrosion behaviors were also reviewed in this paper. Some suggestions on the future study of corrosion behaviors of SLMed Al alloys were put forward.

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“…Although XRD is widely used to estimate the residual stresses, there is a debate on the obtained residual stress values and the measurement procedure for SLM-produced samples. Some studies revealed that the residual stresses were frequently shown to approach the material's yield strength [19,22,23], while residual stresses reported for SLM-produced AlSi10Mg (summarized in Table 1) were far lower than its yield strength reported in the literature (200-300 MPa [24][25][26][27]). Moreover, a significant fluctuation was observed in the reported values and the sign of the surface residual stress cannot be determined properly.…”

Section: Introductionmentioning

confidence: 96%

Strategy of Residual Stress Determination on Selective Laser Melted Al Alloy Using XRD

Chen

Sun

Li³

et al. 2020

Materials

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Selective laser melting (SLM) is known to generate large and anisotropic residual stresses in the samples. Accurate measurement of residual stresses on SLM-produced samples is essential for understanding the residual stress build-up mechanism during SLM, while a dramatic fluctuation can be observed in the residual stress values reported in the literature. On the basis of studying the influence of surface roughness on residual stress measured using X-ray diffraction (XRD), we propose a procedure coupling XRD technique with pretreatment consisting of mechanical polishing and chemical etching. The results highlight that residual stresses measured using XRD on as-built SLM-produced samples with high surface roughness are significantly lower than those measured on samples with finished surface, which is due to the stress relaxation on the spiked surface of as-built samples. Surface distribution of residual stresses and the effect of scanning strategy were systematically investigated for SLM-produced AlSi10Mg samples. Microstructural morphology was observed at the interface between sample and building platform and was linked to the surface distribution of residual stresses. This procedure can help us accurately measure the residual stresses in SLM-produced samples and thus better understand its build-up mechanism during the SLM process.

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High-temperature mechanical properties of AlSi10Mg specimens fabricated by additive manufacturing using selective laser melting technologies (AM-SLM)

Cited by 94 publications

References 29 publications

VHCF Response up to 109 Cycles of SLM AlSi10Mg Specimens Built in a Vertical Direction

VHCF Response up to 109 Cycles of SLM AlSi10Mg Specimens Built in a Vertical Direction

Corrosion Behaviors of Selective Laser Melted Aluminum Alloys: A Review

Strategy of Residual Stress Determination on Selective Laser Melted Al Alloy Using XRD

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