Review on thermal analysis in laser-based additive manufacturing

Yan, Zhaorui; Liu, Weiwei; Tang, Zijue; Liu, Xuyang; Zhang, Nan; Li, Mingzheng; Zhang, Hongchao

doi:10.1016/j.optlastec.2018.04.034

Cited by 193 publications

(71 citation statements)

References 105 publications

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“…cation map are far from the boundaries of the domains, one can qualitatively justify the varying microstructure along the thickness depth of the wall. More precise evaluations of thermal gradients, cooling rates and melt pool shapes could be carried out using high-fidelity thermal simulations [42] to support the qualitative analysis presented here.…”

Section: Convection and Conduction Cooling Mechanismsmentioning

confidence: 92%

Influence of interlayer dwell time on the microstructure of Inconel 718 Laser Cladded components

Guévenoux

Hallais

Charles

et al. 2020

Optics & Laser Technology

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Laser Cladding is one of the leading additive manufacturing technologies enabling the repair of metallic components. Their fatigue reliability depends directly on the material microstructure and consequently on the process parameters. This study highlights the influence of the interlayer dwell time on single-track walls for Inconel 718 repaired components. EBSD analyses show that dwell time both reduces grain size and creates a textural stretch of the microstructure. An optimal dwell time between the writing of successive layers can then be introduced to target a specified microstructure gradient at the interface between the original part and the repaired deposit.

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Section: Convection and Conduction Cooling Mechanismsmentioning

confidence: 92%

Influence of interlayer dwell time on the microstructure of Inconel 718 Laser Cladded components

Guévenoux

Hallais

Charles

et al. 2020

Optics & Laser Technology

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“…Real-time monitoring is commonly used to detect defects in laser material processing. [8][9][10] It has been successfully used with adaptive control to achieve stable cuts with a CO 2 laser by adjusting process parameters, 11 but it could as well be used with active cooling or online tool path adaptations. Such a solution has a significant impact in terms of hardware requirements and system design.…”

Section: Introductionmentioning

confidence: 99%

Anticipating heat accumulation in laser oxygen cutting of thick metal plates

Levichev

Rodrigues

Dewil

et al. 2020

Journal of Laser Applications

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Excessive heating of the metal sheet during laser oxygen cutting can cause quality deterioration and even lead to cut loss and possible machine idle time, especially for cutting of thick plates, where the cutting speed is slower. There are at least three different strategies to handle quality deterioration by heat accumulation in flame laser cutting of thick plates: to optimize the process parameters for preheated zones, to generate tool paths that avoid such regions, or to use active cooling to remove the excessive heat. For any of these strategies to work, it is crucial to correctly identify when and where heat accumulations occur. This can be done by real-time temperature measurements, by simulating heat propagation on the metal plate, or by defining empirical criteria based on experimental data. This paper takes a close look at these methods of heat accumulation detection, their advantages and disadvantages, and how they can be integrated into different approaches to tackle unwanted heat accumulations in laser cutting. Furthermore, three case studies are provided, one for each abovementioned method, where the detection of quality degradation due to heat accumulation is demonstrated with a series of experiments. For all case studies, at least one action is proposed to improve the cut quality. All experiments were conducted for 15 mm mild steel plates using a 4 kW industrial fiber laser cutting machine.

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“…This is the used method to update the model to consider newly melted metal powders through the nozzle (fig 4). In this research, we considered a constant temperature for melted powders as the initial condition rather than using laser energy and conventional Gaussian surface heat source, top-hat distribution, or Goldak's double ellipsoid heat source [41] as a boundary condition. The higher temperature of melted powders means higher laser power.…”

Section: -Computational Methodsmentioning

confidence: 99%

Direct Laser Deposition Metal 3D Printing at Different Temperatures of the Printer’s Chamber: Computer Simulation

Hosseinzadeh¹

2020

Preprint

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Metal 3D printing technology is a promising manufacturing method. The quality of the printed product can pass for mechanical application, if the anisotropy of the microstructure, imperfections, deformation, and residual stress of the printed sample could be lower than the appropriate level or if they are fully illuminated. Thermal stress is one of the significant reasons for deformation in the 3D printed samples. Thermal stresses are the direct consequence of the local temperature gradient. In this research, the effect of the temperature printer’s chamber (from room temperature to 900 C) was studied on thermal stress and subsequent total deformation in the printed sample. The printed sample is a six-layers-printed walk, which could be considered as a building block of other complex shapes and give us inside about deformation. The computational results show a meaningful reduction in thermal stress and deformation at the higher temperature of the printer’s chamber. The lower final deformation of the printed sample is an important subject, especially for samples with complex shapes.

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Review on thermal analysis in laser-based additive manufacturing

Cited by 193 publications

References 105 publications

Influence of interlayer dwell time on the microstructure of Inconel 718 Laser Cladded components

Influence of interlayer dwell time on the microstructure of Inconel 718 Laser Cladded components

Anticipating heat accumulation in laser oxygen cutting of thick metal plates

Direct Laser Deposition Metal 3D Printing at Different Temperatures of the Printer’s Chamber: Computer Simulation

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