Three-Dimensional Modeling of Laser Sintering of a Two-Component Metal Powder Layer on Top of Sintered Layers

Chen, Tiebing; Zhang, Kun

doi:10.1115/1.2716714

Cited by 20 publications

(11 citation statements)

References 18 publications

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“…The process heat transfer mechanisms are complex and have been investigated in previous studies [1,2]. Mathematical models have been proposed to explore the heat transfer mechanisms in single laser scan tracks [3,4]. These have provided an insight into the flow of matter and energy in the laser sintering process.…”

Section: Introductionmentioning

confidence: 98%

A three-dimensional finite element analysis of the temperature field during laser melting of metal powders in additive layer manufacturing

Roberts

Wang

Esterlein

et al. 2009

International Journal of Machine Tools and Manufacture

592

244

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Section: Introductionmentioning

confidence: 98%

A three-dimensional finite element analysis of the temperature field during laser melting of metal powders in additive layer manufacturing

Roberts

Wang

Esterlein

et al. 2009

International Journal of Machine Tools and Manufacture

592

244

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“…The former approach was applied in [2,3] where a model of single and multilayer sintering of single component powders was proposed. Darcy's law is more relevant in the simulation of two component powders; the refractory component forms a framework through which the molten material seeps due to gravity and capillary forces [4][5][6]. Since, during melting, the volume fraction of gas in the powder system is decreasing, there is a significant change in its density.…”

Section: Introductionmentioning

confidence: 99%

Heat and mass transfer under laser sintering of a powder mixture

Niz'ev

Mirzade

Panchenko

et al. 2012

Math Models Comput Simul

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A model of heat and mass transfer during the sintering process of a two component powder mixture under the action of laser beam irradiation was formulated and numerically investigated. The model accounts for the movement of solid particles in a shrinkage caused by the changed density of the powder mixture, as well as for convective fluxes caused by surface forces and gravity. The flow of the liquid phase of the low melting component of the mixture was described by the generalized Darcy law. The space inhomogeneous and non steady distributions of the phase saturations and the temper ature field were estimated to predict the dynamics of the phase change process depending on the prop erties of the powder mixture (porosity, penetration, and thermal properties of components), and depending on the parameters of the laser beam. The effect of surface subsidence of the powder mixture has been considered.

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“…Simchi [19], Kruth et al [2], and Das [20] studied the changes in the microstructure of the part in the DMLS process and the effect of the shrinkage on the microstructural development. Zhang et al [21] and Chen and Zhang [22] studied the sintering mechanism of two powder metal systems in laser sintering processes and analyzed the amount of shrinkage induced in such systems. Jamshidinia et al [23] developed a numerical model for studying the heat distribution in the EBM process for manufacturing titanium alloy parts.…”

Section: Introductionmentioning

confidence: 99%

Effect of Thermal Deformation on Part Errors in Metal Powder Based Additive Manufacturing Processes

Paul

Anand

Gerner

2014

Journal of Manufacturing Science and Engineering

151

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In metal additive manufacturing (AM) processes, parts are manufactured in layers by sintering or melting metat or metal altoy powder under the effect of a powerful taser or an electron beam. As the laser/electron beam scans the powder bed, it melts the powder in successive tracks which overlap each other. This overlap, called the hatch overlap, results in a continuous cycle of rapid melting and resolidiflcation of the metat. The metting of the metal from powder to liquid and subsequent sotidification causes anisotropic shrinkage in the layers. The thermat strains caused by the thermat gradients existing between the different layers and between the layers and the substrate leads to considerabte thermat stresses in the part. As a resutt, stress gradients devetop in the different directions of the part which lead to distortion and warpage in AM parts. The deformations due to shrinkage and thermal stresses have a signiflcant effect on the dimensional inaccuracies of the final part. A three-dimensional thermomechanicat finite etement (EE) modet has been devetoped in this paper which calculates the thermat deformation in AM parts based on slice thickness, part orientation, scanning speed, and materiat properties. The EE modet has been vatidated and benchmarked with resutts atready avaitabte in titerature. The thermat deformation modet is then superimposed with a geometric virtuat manufacturing model of' the AM process to catcutate the form and runout errors in AM parts. Einalty, the errors in the criticat features of the AM parts calculated using the combined thermat deformation and geometric modet are corretated with part orientation and stice thickness.

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Three-Dimensional Modeling of Laser Sintering of a Two-Component Metal Powder Layer on Top of Sintered Layers

Cited by 20 publications

References 18 publications

A three-dimensional finite element analysis of the temperature field during laser melting of metal powders in additive layer manufacturing

A three-dimensional finite element analysis of the temperature field during laser melting of metal powders in additive layer manufacturing

Heat and mass transfer under laser sintering of a powder mixture

Effect of Thermal Deformation on Part Errors in Metal Powder Based Additive Manufacturing Processes

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