A Smoothed Particle Hydrodynamics Model for Laser Beam Melting of Ni-based Alloy 718

Weirather, J.; Rozov, Vladyslav; Wille, Mario; Schüler, Paul; Seidel, Christian; Adams, Nikolaus A.; Zaeh, Michael F.

doi:10.1016/j.camwa.2018.10.020

Cited by 58 publications

(32 citation statements)

References 55 publications

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“…Tanaka et al investigated also heat conduction due to a stationary or moving laser source using the moving particle semi-implicit method similar to SPH [31]. In addition to [28], selective laser melting was modelled by WCSPH in [32][33][34].…”

Section: Introductionmentioning

confidence: 99%

An Incompressible Smoothed Particle Hydrodynamics (ISPH) Model of Direct Laser Interference Patterning

Demuth

Lasagni

2020

Computation

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Functional surfaces characterised by periodic microstructures are sought in numerous technological applications. Direct laser interference patterning (DLIP) is a technique that allows the fabrication of microscopic periodic features on different materials, e.g., metals. The mechanisms effective during nanosecond pulsed DLIP of metal surfaces are not yet fully understood. In the present investigation, the heat transfer and fluid flow occurring in the metal substrate during the DLIP process are simulated using a smoothed particle hydrodynamics (SPH) methodology. The melt pool convection, driven by surface tension gradients constituting shear stresses according to the Marangoni boundary condition, is solved by an incompressible SPH (ISPH) method. The DLIP simulations reveal a distinct behaviour of the considered substrate materials stainless steel and high-purity aluminium. In particular, the aluminium substrate exhibits a considerably deeper melt pool and remarkable velocity magnitudes of the thermocapillary flow during the patterning process. On the other hand, convection is less pronounced in the processing of stainless steel, whereas the surface temperature is consistently higher. Marangoni convection is therefore a conceivable effective mechanism in the structuring of aluminium at moderate fluences. The different character of the melt pool flow during DLIP of stainless steel and aluminium is confirmed by experimental observations.

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Section: Introductionmentioning

confidence: 99%

An Incompressible Smoothed Particle Hydrodynamics (ISPH) Model of Direct Laser Interference Patterning

Demuth

Lasagni

2020

Computation

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“…( 10) is a discretized version of the shear viscosity term. However, this type of difference-based Laplacian model [2,9,18,[41][42][43] does not conserve angular momentum and unphysically hinders rotational motion. It is because the direct use of the relative velocity u ij yields the torque against rotation.…”

Section: Discretization Of Governing Equationmentioning

confidence: 99%

“…As Weiler et al [16] pointed out, the angular momentum conservation plays an important role for calculating rotational motion of highviscous objects with free-surface. However, when the viscosity term was discretized using the difference-based Laplacian models [2,9,18,[41][42][43], which are often used in SPH and MPS, the rotational motion is unphysically suppressed because of the torque against rotation. In some researches, the gradient model was applied twice [6, 19, 20, 22-24, 26, 27, 30] instead of directly applying the difference-based Laplacian model.…”

Section: Introductionmentioning

confidence: 99%

A physically consistent particle method for high-viscous free-surface flow calculation

Kondo

Fujiwara²,

Masaie³

et al. 2021

Comp. Part. Mech.

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Particle methods for high-viscous free-surface flows are of great use to capture flow behaviors which are intermediate between solid and liquid. In general, it is important for numerical methods to satisfy the fundamental laws of physics such as the conservation laws of mass and momentum and the thermodynamic laws. Especially, the angular momentum conservation is necessary to calculate rotational motion of high-viscous objects. However, most of the particle methods do not satisfy the physical laws in their spatially discretized system. The angular momentum conservation law is broken mostly because of the viscosity models, which may result in physically strange behavior when high-viscous free-surface flow is calculated. In this study, a physically consistent particle method for high-viscous free-surface flows is developed. The present method was verified, and its performance was shown with calculating flow in a rotating circular pipe, high-viscous Taylor–Couette flow, and offset collision of a high-viscous object.

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“…However, the latest research found that absorptivity is related to the morphology and temperature of the melt pool. The approximation of the temperature-dependent absorptivity can be derived [25,26], which is the function of the laser wavelength and the electrical resistivity.…”

Section: Absorptivity Of In718mentioning

confidence: 99%

The Analytical Prediction of Thermal Distribution and Defect Generation of Inconel 718 by Selective Laser Melting

Yang

Wang

2020

Applied Sciences

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In selective laser melting, the rapid change of the temperature field caused by the rapid movement of the laser causes the instability of the melt pool flow, resulting in a generation of defects, such as lack of fusion, keyholing and balling effect, which greatly affect the performance of parts. In order to fully understand the temperature distribution and defect generation process of selective laser melting (SLM), experimental research, numerical simulation and analytical methods are mainly applied. The analytical method is suitable for the determination of the optimal process parameters because it is simple and consumes fewer resources. In a simulation, the absorptivity of the material is usually regarded as a constant, but experimental studies have shown that absorptivity is related to temperature, laser power, scanning speed, layer thickness and other process parameters. Considering the dynamics of thermal physical properties of Inconel 718, an improved analytical method was proposed and successfully applied to thermal analysis and the prediction of melt pool size. By comparing with the results of finite element simulation, experiment and other analytical solutions, the ease of use and effectiveness of the method are verified. Based on the prediction of the melt pool and the criterion of internal defects, the combination of process parameters that produce internal defects is calculated, which will make it possible to quickly obtain ideal process parameters.

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A Smoothed Particle Hydrodynamics Model for Laser Beam Melting of Ni-based Alloy 718

Cited by 58 publications

References 55 publications

An Incompressible Smoothed Particle Hydrodynamics (ISPH) Model of Direct Laser Interference Patterning

An Incompressible Smoothed Particle Hydrodynamics (ISPH) Model of Direct Laser Interference Patterning

A physically consistent particle method for high-viscous free-surface flow calculation

The Analytical Prediction of Thermal Distribution and Defect Generation of Inconel 718 by Selective Laser Melting

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