Effects of processing parameters and heat treatment on thermal conductivity of additively manufactured AlSi10Mg by selective laser melting

Butler, Colin; Babu, Satish; Lundy, Ross; Meehan, R. O’Reilly; Punch, Jeff; Jeffers, Nicholas

doi:10.1016/j.matchar.2021.110945

Cited by 48 publications

(16 citation statements)

References 47 publications

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“…The presence of pure copper in the mixed AlSi10Mg+4Cu system is an adverse condition for a proper laserpowder interaction due to the extremely different thermal conductivity and melting temperature of the starting powders [31,32]. On the other hand, observing the XRD spectrum performed on pre-alloyed AlSi10Cu4Mg powder (figure 2), no peaks referring to the Cu pattern were visible, but only peaks of Al 2 Cu phase.…”

Section: Laser-powder Interaction Study With Single Scan Tracksmentioning

confidence: 99%

“…On the other hand, figure 5(b) show as the presence of non-spherical pores with irregular shapes and larger sizes increased with the scan speed values. In the literature, these porosities are known as lack of fusion pores and are attributed to an insufficient energy input that usually occurs when too high scan speed or low VED values are used [31]. The highly irregular shape of these porosities leads to a notch effect, reducing the loading capacity and thus compromising the mechanical performance.…”

Section: Bulk Processabilitymentioning

confidence: 99%

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Improvement in the PBF-LB/M processing of the Al-Si-Cu-Mg composition through the use of pre-alloyed powder

Martucci

Gobber

Aversa

et al. 2023

Mater. Res. Express

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Among the many additive manufacturing technologies for metals, Powder Bed Fusion-Laser Beam (PBF-LB\M) stands out for its capacity to produce complex-shaped functional parts. However, the PBF-LB\M materials portfolio is still limited and the research into new high-performance Al-based alloys is ongoing. The improved properties with the addition of 4 wt% Cu to the AlSi10Mg alloy have been previously investigated in the literature through the in-situ alloying approach in which the starting powders of Cu and AlSi10Mg are mechanically mixed and directly processed. However, inhomogeneities of alloying elements were found in samples produced with mixed AlSi10Mg+4Cu powders. To overcome this issue, the use of pre-alloyed AlSI10Cu4Mg powder obtained via gas atomisation process could be a powerful solution. With the aim of demonstrating the beneficial effects of pre-alloyed AlSi10Cu4Mg powders in laser-powder interaction, preliminary SEM investigations were conducted on cross-sectioned SSTs and bulk samples after optimising the process parameters. The microstructural investigations conducted on pre-alloyed AlSi10Cu4Mg samples revealed a higher homogeneity of alloying elements, a smaller cell size of the Al-Si-Cu network (0.5 vs 0.8 µm) and a slightly smaller mean diameter of equiaxial grains compared to the mixed AlSi10Mg+4Cu ones (6.01 vs 7.34 µm). Moreover, looking closer at the supersaturation level and the precipitation behaviour in pre-alloyed AlSi10Cu4Mg composition, a high solid solution level, a massive presence of Al2Cu in the cell network and only a few finely dispersed Al2Cu precipitates within the cells were found. Exploring the benefits of these microstructural features on mechanical properties, an increase in performance of about 18 % in micro-hardness tests and more than 10 % in tensile and compressive tests were found in the AlSi10Cu4Mg system with respect to the mixed AlSi10Mg+4Cu system. All the thorough investigations proved how using pre-alloyed powders is an important advantage in the PBF-LB/M production of complex Al-based systems.

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Section: Laser-powder Interaction Study With Single Scan Tracksmentioning

confidence: 99%

Section: Bulk Processabilitymentioning

confidence: 99%

Improvement in the PBF-LB/M processing of the Al-Si-Cu-Mg composition through the use of pre-alloyed powder

Martucci

Gobber

Aversa

et al. 2023

Mater. Res. Express

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show abstract

“…Different from thermal properties of solid which are fitted polynomials based on experimental data, thermal properties of powder denoted as κ𝑝 , 𝜌 𝑝 and c𝑝 in Eq. (A.3) are modeled according to the porosity of powder bed 𝜙 𝑝 , the materials, and the inert gas atmosphere [34,35].…”

Section: Data Availabilitymentioning

confidence: 99%

Time-Efficient Surrogate Models of Thermal Modeling in Laser Powder Bed Fusion

Li¹,

Polydorides²

2022

SSRN Journal

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“…The results showed that an appropriate post-processing method can significantly enhance the fatigue strength of manufactured parts. Butler et al [85] studied the thermal conductivity of AM AlSi10Mg alloy by comparing the as-manufactured and thermal post-processed parts. The results demonstrated that the thermal conductivity can be significantly increased after thermal post-processing.…”

Section: Thermal Post-processingmentioning

confidence: 99%

A Review of Post-Processing Technologies in Additive Manufacturing

Peng

Kong

Fuh

et al. 2021

JMMP

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Additive manufacturing (AM) technology has rapidly evolved with research advances related to AM processes, materials, and designs. The advantages of AM over conventional techniques include an augmented capability to produce parts with complex geometries, operational flexibility, and reduced production time. However, AM processes also face critical issues, such as poor surface quality and inadequate mechanical properties. Therefore, several post-processing technologies are applied to improve the surface quality of the additively manufactured parts. This work aims to document post-processing technologies and their applications concerning different AM processes. Various types of post-process treatments are reviewed and their integrations with AM process are discussed.

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Effects of processing parameters and heat treatment on thermal conductivity of additively manufactured AlSi10Mg by selective laser melting

Cited by 48 publications

References 47 publications

Improvement in the PBF-LB/M processing of the Al-Si-Cu-Mg composition through the use of pre-alloyed powder

Improvement in the PBF-LB/M processing of the Al-Si-Cu-Mg composition through the use of pre-alloyed powder

Time-Efficient Surrogate Models of Thermal Modeling in Laser Powder Bed Fusion

A Review of Post-Processing Technologies in Additive Manufacturing

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