Microstructural evolution and EBSD analysis of AlSi10Mg alloy fabricated by selective laser remelting

Guan, Jieren; Jiang, Yehua; Zhang, Xiaowei; Chong, Xiaoyu

doi:10.1016/j.matchar.2019.110079

Cited by 62 publications

(18 citation statements)

References 21 publications

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“…The only presence of equiaxed grains that dominate the entire microstructure can be observed. Pham et al [37] and Guan et al [38] showed the same microstructural configuration through the EBDS analysis carried out on AlSi10Mg SLMed samples. On the other hand, the SL-50 samples show the molten pool cross-sections (Figure 2e) that are only dominated by columnar grains arranged along the thermal gradient, as studied and reported in [23].…”

Section: Microstructurementioning

confidence: 63%

Work Hardening of Heat-Treated AlSi10Mg Alloy Manufactured by Selective Laser Melting: Effects of Layer Thickness and Hatch Spacing

Ghio

Cerri

2021

Materials

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The present study analyzed the microstructure and the mechanical properties of AlSi10Mg SLMed bars (10 × 10 × 300 mm) and billets (10 × 100 × 300 mm) before and after the direct aging at 200 °C for 4 h and the T6 heat treatment. The discussed results are compared to those obtained by the AlSi10Mg samples manufactured with the same geometry but using different process parameters (layer thickness higher than 40 μm and a hatch spacing lower than 100 μm) and also through the Quality Index (QI). These work conditions allow the obtaining of a microstructural variation and different tensile properties in as-built top samples. In both batches, the cycle time was 45 h and together with the preheated build platform at 150 °C, induced an increase of UTS (Ultimate Tensile Strength) and yield strength on the bottom rather than the top samples due to the aging phenomena. Upon completion of the direct aging heat treatment, the effects induced by the platform were cancelled, keeping a full cellular microstructure that characterized the as-built SLMed (Selective Laser Melted) samples. Moreover, the Considère criterion and the work hardening analysis showed that the failure occurs after the necking formation in some of the T6 heat-treated samples. In this last case, the Si eutectic network globularized into Si particles, causing a decrease of UTS (from around 400 MPa to 290 MPa) in favour of an increase of ductility up to 15% and reaching a QI in the range 400 ÷ 450 MPa. These values place these samples between the high-quality aluminium cast alloy and T6 heat-treated ones.

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Section: Microstructurementioning

confidence: 63%

Work Hardening of Heat-Treated AlSi10Mg Alloy Manufactured by Selective Laser Melting: Effects of Layer Thickness and Hatch Spacing

Ghio

Cerri

2021

Materials

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“…The L-PBF experiments were performed on a self-developed machine which has been addressed (Guan et al , 2019). The optimized processing parameters were also reported (Guan et al , 2019; Guan et al , 2020). Based on the fact of simulation results, aluminum alloy was formed as substrate in the first L-PBF process.…”

Section: Experimental Methods and Materialsmentioning

confidence: 99%

Forming feasibility and interface microstructure of Al/Cu bimetallic structure fabricated by laser powder bed fusion

Guan

Wang

Chen

et al. 2021

RPJ

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Purpose The purpose of this paper is to analyze and investigate heat accumulation caused by temperature changes and interface microstructure effected by element diffusion. Design/methodology/approach Al/Cu bimetallic structure is initially manufactured through laser powder bed fusion process. To minimize trial and error, finite element modeling is adopted to simulate temperature changes on the Al-based and Cu-based substrate. Findings The results show that forming pure copper on Al-based substrate can guarantee heat accumulation, providing enough energy for subsequent building. The instantaneous laser energy promotes increase of diffusion activation energy, resulting in the formation of transition zone derived from interdiffusion between Al and Cu atoms. The interface with a thickness of about 22 µm dominated by Kirkendall effect moves towards Al-rich side. The interface microstructure is mainly composed of a-Al, a-Cu and CuAl2 phase. Originality/value The bonding mechanism of Al/Cu interface is atom diffusion-induced chemical reaction. The theoretical basis provides guidance for structural design and production application.

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“…The figure shows that with the values of Beam Expander 1, 2 and energy inputs of 100 and 75% for single or dual scanning, respectively, a density of 7.8 g/cm 3 is achieved, that corresponds to a porosity of 1% or less. With an energy input of 50%, the density of the samples decreases to 7.2 g/cm 3 , that corresponds to a porosity of about 10%. For the Beam Expander 4.5 value, it is not possible to achieve a density of more than 7.6 g/cm 3 for any energy input.…”

Section: Sample Densitymentioning

confidence: 97%

“…For the Beam Expander 4.5 value, it is not possible to achieve a density of more than 7.6 g/cm 3 for any energy input. The lowest density value is 6.7 g/cm 3 , that corresponds to a porosity of 15%. The data obtained can be used to create samples with a given value of porosity and more than 15%.…”

Section: Sample Densitymentioning

confidence: 99%

“…Currently, studies of the influence building parameters on the structure of fused steels are already being actively conducted. For example, it was shown in [3,4] that, using various scanning strategies, a clear epitaxial growth along the heat flux with an orientation of <100> can be obtained, that can enhance isotropy. It was also shown that the change in yield strength is mainly associated with different grain sizes, and improved ductility was associated with a changed grain structure, based on the use of different scans [4].…”

Section: Introductionmentioning

confidence: 99%

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The study of the regularities of structure formation and properties of the L-PBF metal as a set of processes on the way to create a controlled structure

et al. 2020

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In this work, to study the effect of laser powder bed fusion (L-PBF) parameters on the microstructure and mechanical properties of 321 austenitic steel, a series of samples were created combining various combinations of L-PBF technological modes, such as: laser spot diameter, scanning speed, laser power, scanning strategy. The possibility of controlling the structure formation of steel in the L-PBF process with the aim of obtaining a given crystallographic texture, grain size and morphology is estimated. The relationship between the resulting anisotropic structure and mechanical properties is investigated.

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Microstructural evolution and EBSD analysis of AlSi10Mg alloy fabricated by selective laser remelting

Cited by 62 publications

References 21 publications

Work Hardening of Heat-Treated AlSi10Mg Alloy Manufactured by Selective Laser Melting: Effects of Layer Thickness and Hatch Spacing

Work Hardening of Heat-Treated AlSi10Mg Alloy Manufactured by Selective Laser Melting: Effects of Layer Thickness and Hatch Spacing

Forming feasibility and interface microstructure of Al/Cu bimetallic structure fabricated by laser powder bed fusion

The study of the regularities of structure formation and properties of the L-PBF metal as a set of processes on the way to create a controlled structure

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