Assessment of the Mechanical Properties of AlSi10Mg Parts Produced through Selective Laser Melting Under Different Conditions

Silvestri, Alessia Teresa; Astarita, Antonello; Hassanin, Andrea El; Manzo, Alessandro; Iannuzzo, Ubaldo; Iannuzzo, Generoso; Rosa, Vincenzo De; Acerra, Francesco; Squillace, Antonino

doi:10.1016/j.promfg.2020.04.115

Cited by 25 publications

(21 citation statements)

References 6 publications

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“…The modulus of elasticity varies from about 350 GPa, a value between the glass fibres and aluminium ones, up to 7000 GPa, or three times greater than that of steel, as easily comparable from Silvestri’s work [ 23 ].…”

Section: Methodsmentioning

confidence: 79%

Effect of Fibre Orientation on Novel Continuous 3D-Printed Fibre-Reinforced Composites

et al. 2021

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Among the several additive manufacturing techniques, fused filament fabrication (FFF) is a 3D printing technique that is fast, handy, and low cost, used to produce complex-shaped parts easily and quickly. FFF adds material layer by layer, saving energy, costs, raw material costs, and waste. Nevertheless, the mechanical properties of the thermoplastic materials involved are low compared to traditional engineering materials. This paper deals with the manufacturing of composite material laminates obtained by the Markforged continuous filament fabrication (CFF) technique, using an innovative matrix infilled by carbon nanofibre (Onyx), a high-strength thermoplastic material with an excellent surface finish and high resistance to chemical agents. Three macro-categories of samples were manufactured using Onyx and continuous carbon fibre to evaluate the effect of the fibre on mechanical features of the novel composites and their influence on surface finishes. SEM (Scanning Electron Microscopy) analysis and acquisition of roughness profile by a confocal lens were conducted. Tensile and compression tests, thermogravimetric analysis and calorimetric analysis using a DSC (differential scanning calorimeter) were carried out on all specimen types to evaluate the influence of the process parameters and layup configurations on the quality and mechanical behaviour of the 3D-printed samples.

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Section: Methodsmentioning

confidence: 79%

Effect of Fibre Orientation on Novel Continuous 3D-Printed Fibre-Reinforced Composites

et al. 2021

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“…The characteristics of this material have thus been studied previously and in detail by several authors. Among others, multiple studies are available which investigate the influence of factors such as scanning parameters [ 14 , 15 ], build orientation [ 14 , 16 , 17 , 18 ], post-processing including heat treatment [ 19 , 20 , 21 , 22 ] or state of powder, e.g., after recycling [ 23 , 24 , 25 ], on room temperature mechanical properties. Figure 1 provides an overview of the findings based on yield strength, ultimate tensile strength and elongation at failure and illustrates the effect of heat treatments on room temperature properties.…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Mechanical Properties of Stress-Relieved AlSi10Mg Produced via Laser Powder Bed Fusion Additive Manufacturing

et al. 2022

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The present study is dedicated to the evaluation of the mechanical properties of an additively manufactured (AM) aluminum alloy and their dependence on temperature and build orientation. Tensile test samples were produced from a standard AlSi10Mg alloy by means of the Laser Powder Bed Fusion (LPBF) or Laser Beam Melting (LBM) process at polar angles of 0°, 45° and 90°. Prior to testing, samples were stress-relieved on the build platform for 2 h at 350 °C. Tensile tests were performed at four temperature levels (room temperature (RT), 125, 250 and 450 °C). Results are compared to previously published data on AM materials with and without comparable heat treatment. To foster a deeper understanding of the obtained results, fracture surfaces were analyzed, and metallographic sections were prepared for microstructural evaluation and for additional hardness measurements. The study confirms the expected significant reduction of strength at elevated temperatures and specifically above 250 °C: Ultimate tensile strength (UTS) was found to be 280.2 MPa at RT, 162.8 MPa at 250 °C and 34.4 MPa at 450 °C for a polar angle of 0°. In parallel, elongation at failure increased from 6.4% via 15.6% to 26.5%. The influence of building orientation is clearly dominated by the temperature effect, with UTS values at RT for polar angles of 0° (vertical), 45° and 90° (horizontal) reaching 280.2, 272.0 and 265.9 MPa, respectively, which corresponds to a 5.1% deviation. The comparatively low room temperature strength of roughly 280 MPa is associated with stress relieving and agrees well with data from the literature. However, the complete breakdown of the cellular microstructure reported in other studies for treatments at similar or slightly lower temperatures is not fully confirmed by the metallographic investigations. The data provide a basis for the prediction of AM component response under the thermal and mechanical loads associated with high-pressure die casting (HPDC) and thus facilitate optimizing HPDC-based compound casting processes involving AM inserts.

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“…It is particularly interesting for industrial applications because of the reduction in material waste, the fact that material is only used where it is desired. Indeed, unlike powder bed fusion techniques, DLD processes are not used to melt a material that is pre-laid in a powder bed but is used to melt materials as they are being deposited [14,15]. Another great advantage is the possibility to repair an object or to print a multi-material workpiece in a unique process [16].…”

Section: Introductionmentioning

confidence: 99%

Exploring Potentialities of Direct Laser Deposition: Thin-Walled Structures

Silvestri

Perini

Bosetti

et al. 2022

KEM

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In the context of Industry 4.0, the interest towards the additive manufacturing processes is growing due to their numerous advantages, such as the possibility to prototype, the reduction of waste material, the inferior time to market, ad so on. In particular, a promising technology is the Direct Laser Deposition, which uses a focused laser beam to melt powders as there are deposited. In opposition to the well-established powder-bed fusion technologies, there are still some issues related to this process. This work aims to solve one of them, exploring the potentialities of DLD in printing thin-wall structures. For this purpose, the influence of the adopted deposition strategy and of the layer thickness on the geometrical accuracy and mechanical properties has been investigated. The results have pointed out that the first variable strongly influences the workpiece. It is possible to deposit thin-wall structures with a ZigZag strategy and consider a layer thickness equal to 90% of the height of the single track, printed with the same process parameters.

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Assessment of the Mechanical Properties of AlSi10Mg Parts Produced through Selective Laser Melting Under Different Conditions

Cited by 25 publications

References 6 publications

Effect of Fibre Orientation on Novel Continuous 3D-Printed Fibre-Reinforced Composites

Effect of Fibre Orientation on Novel Continuous 3D-Printed Fibre-Reinforced Composites

High-Temperature Mechanical Properties of Stress-Relieved AlSi10Mg Produced via Laser Powder Bed Fusion Additive Manufacturing

Exploring Potentialities of Direct Laser Deposition: Thin-Walled Structures

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