Numerical investigation of heat current study across different platforms in SLM processed multi-layer AlSi10Mg

Khan, Hamaid Mahmood; Dirikolu, M. Hüsnü; Koç, Ebubekir; Oter, Zafer Cagatay

doi:10.1016/j.ijleo.2018.05.081

Cited by 27 publications

(9 citation statements)

References 29 publications

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“…The decrease of scan speed brings similar effect. It is consistent with other researchers [ 13 , 14 ] done without rotation angle. The application of the rotation angle does not affect general heat absorption trend.…”

Section: Discussionsupporting

confidence: 93%

“…Even though the previous temperature profile plays a part of the melt pool geometry formation, it is not the essential element. It is worth mentioning that, unlike in most of the FEM models [ 12 , 13 , 14 , 34 ], the current model does not consider the boundary condition. The part is still considered as a semi-infinite media, where the heat loss at the boundary is neglected.…”

Section: Discussionmentioning

confidence: 99%

“…As the re-melting time for a specific point was increasing, the melt pool was enlarged. Khan et al [ 14 ] built their FEM model focusing on different support structures during SLM building. They studied the heat dissipation in AlSi10Mg parts built with solid base, supporting structures, and loosely placed powder.…”

Section: Introductionmentioning

confidence: 99%

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Analytical Modelling of Temperature Distribution in SLM Process with Consideration of Scan Strategy Difference between Layers

Cai

Liang

2021

Materials

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In the practical selective laser melting (SLM) manufacturing process, the scan strategy often varies between layers to avoid overlapping of the melted area, which affects the residual stress and deflection of the final build. Yet not much modelling work has been done to accommodate the angle between layers. The paper proposed an analytical thermal model to address the scan strategy difference, such as laser scan direction difference between layers, which brings the model closer to the practical scan situation. The analytical transient moving point heat solution is adopted in this model. The laser movement is first considered in a laser coordinates, which originates at the laser radiation spot, and then transferred into a stationary coordinate, which originates at the starting point of the build. The model takes account of multi-track and multi-layer effect by considering thermal property changes caused by remaining heat, which is further adopted for temperature distribution calculation. The scan direction difference leads to different laser path at each layer, and alters heating and cooling time for a specific point on the build. The proposed model is validated by comparing the predicted melt pool geometries to documented experimental data. The effect of scan direction difference between layers is further discussed in the later part. It is found that the uni- and bi- directional scan leads to diverse temperature profile but its effect on melt depth is not significant. Although the laser rotation angle between layers leads to changes in the melt depth, it is not in a large scale. The proposed model shows that scan strategy does not change melt pool geometry in a significant scale but affects the thermal profile as well as thermal history. It can be used as a step for further modelling work for porosity and deflection.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionmentioning

confidence: 99%

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Analytical Modelling of Temperature Distribution in SLM Process with Consideration of Scan Strategy Difference between Layers

Cai

Liang

2021

Materials

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“…The gradual increase of temperature and melt-pool were reported with the addition of new layers, which helped in obtaining fine grains for low energy input [41]. A similar numerical study was carried out by Khan et al [42]. An experimental investigation was performed to measure the residual stress of SLM-manufactured AISI 316L samples.…”

Section: Introductionmentioning

confidence: 85%

A Comparative Analysis of Laser Additive Manufacturing of High Layer Thickness Pure Ti and Inconel 718 Alloy Materials Using Finite Element Method

et al. 2021

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Investigation of the selective laser melting (SLM) process, using finite element method, to understand the influences of laser power and scanning speed on the heat flow and melt-pool dimensions is a challenging task. Most of the existing studies are focused on the study of thin layer thickness and comparative study of same materials under different manufacturing conditions. The present work is focused on comparative analysis of thermal cycles and complex melt-pool behavior of a high layer thickness multi-layer laser additive manufacturing (LAM) of pure Titanium (Ti) and Inconel 718. A transient 3D finite-element model is developed to perform a quantitative comparative study on two materials to examine the temperature distribution and disparities in melt-pool behaviours under similar processing conditions. It is observed that the layers are properly melted and sintered for the considered process parameters. The temperature and melt-pool increases as laser power move in the same layer and when new layers are added. The same is observed when the laser power increases, and opposite is observed for increasing scanning speed while keeping other parameters constant. It is also found that Inconel 718 alloy has a higher maximum temperature than Ti material for the same process parameter and hence higher melt-pool dimensions.

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“…Factors such as heat flux and thermal gradients greatly affect the growth of the grains, which are not discussed in this paper. Interested readers could look at the references given here [86,[105][106][107]. Ahmad et al [103] showed that AM IN718 has columnar grain growing parallel to the building direction.…”

Section: Grain Structurementioning

confidence: 99%

A Critical Review of the Material Characteristics of Additive Manufactured IN718 for High Temperature Application

Yong¹,

Gibbons²,

West³

2020

Preprint

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This paper reviews state of the art Additive Manufactured (AM) IN718 alloy intended for high temperature applications. AM processes have been around for decades and have gained traction in the past five years due to the huge economic benefit it brings to manufacturers. It is crucial for the scientific community to look into AM IN718 applicability in order to see a step-change in the production. Microstructural studies reveal that the grain structure plays a significant role in determining the fatigue lifespan of the material. Controlling IN718 respective phases such as the &upsih;’', δ and Laves phase is seen to be crucial. Literature reviews have shown that the mechanical properties of AM IN718 were very close to its wrought counterpart when treated appropriately. Higher homogenization temperature and longer ageing were recommended to dissolve the damaging phases. Various surface enhancement techniques were examined to find out their compatibility to AM IN718 alloy that is intended for high temperature application. Laser shock peening (LSP) technology stands out due to the ability to impart low cold work which helps in containing the beneficial compressive residual stress it brings in high temperature fatigue environment.

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Numerical investigation of heat current study across different platforms in SLM processed multi-layer AlSi10Mg

Cited by 27 publications

References 29 publications

Analytical Modelling of Temperature Distribution in SLM Process with Consideration of Scan Strategy Difference between Layers

Analytical Modelling of Temperature Distribution in SLM Process with Consideration of Scan Strategy Difference between Layers

A Comparative Analysis of Laser Additive Manufacturing of High Layer Thickness Pure Ti and Inconel 718 Alloy Materials Using Finite Element Method

A Critical Review of the Material Characteristics of Additive Manufactured IN718 for High Temperature Application

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