Hydrodynamic Instability in High-speed Direct Laser Deposition for Additive Manufacturing

Turichin, Gleb; Zemlyakov, Evgeny; Klimova, Olga; Babkin, Konstantin

doi:10.1016/j.phpro.2016.09.001

Cited by 34 publications

(22 citation statements)

References 8 publications

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“…The high power of the laser source should ensure and maintain a high melting rate of the powder in order to ensure high process productivity up to 1.5–2.5 kg/h [ 4 ]. However, this can lead both to the appearance of instability of the wall formation described in [ 7 ], and to a deviation from the specified dimensions [ 8 ]. A large number of important parameters of the processing mode, and the danger of leaving the process in the zone of unstable formation, greatly complicate the selection of technological parameters by the experimental method.…”

Section: Introductionmentioning

confidence: 99%

“…Finite element analysis allows scientists to take these factors into account, but the calculation time can be hours, or even days. The presented work is a development of the model developed earlier in [ 6 , 7 , 14 , 15 ]; it was developed specifically for modeling the process of forming thin-walled structures. This model takes into account the Marangoni effect, the transfer of the powder by a gas jet, the heating of the powder by laser radiation, the interaction of the jet with the substrate, and heat transfer in the solid and liquid phases, as well as the hydrodynamics of the melt pool.…”

Section: Introductionmentioning

confidence: 99%

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Computer Simulation of Hydrodynamic and Thermal Processes in DLD Technology

et al. 2021

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This article deals with the theoretical issues of the formation of a melt pool during the process of direct laser deposition. The shape and size of the pool depends on many parameters, such as the speed and power of the process, the optical and physical properties of the material, and the powder consumption. On the other hand, the influence of the physical processes occurring in the material on one another is significant: for instance, the heating of the powder and the substrate by laser radiation, or the formation of the free surface of the melt, taking into account the Marangoni effect. This paper proposes a model for determining the size of the melt bath, developed in a one-dimensional approximation of the boundary layer flow. The dimensions and profile of the surface and bottom of the melt pool are obtained by solving the problem of convective heat transfer. The influence of the residual temperature from the previous track, as well as the heat from the heated powder of the gas–powder jet, taking into account its spatial distribution, is considered. The simulation of the size and shape of the melt pool, as well as its free surface profile for different alloys, is performed with 316 L steel, Inconel 718 nickel alloy, and VT6 titanium alloy

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Computer Simulation of Hydrodynamic and Thermal Processes in DLD Technology

et al. 2021

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“…The first one is walls with stable formation (the focus of gas-powder jet is below of substrate surface). The second group is walls with unstable formation (the focus of gaspowder jet is above of substrate surface) [11]. Maximum height of wall is achieved during cladding with gap between nozzle and substrate surface is 12 mm.…”

Section: Resultsmentioning

confidence: 99%

Laser cladding technological machine. Investigation of efficiency of various nozzles design

Korsmik

Turichin

Babkin

2017

J. Phys.: Conf. Ser.

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“…Direct laser deposition is a multiparameter process; therefore the results of the process are affected by a complex of technological parameters [8,23]. Among these parameters, it is possible to identify the main characteristics, which primary determine the course of the process [24]. The basic part of process parameters is described in Table 1, where the first four points are the main parameters.…”

Section: Technology and Equipment Of Direct Laser Deposition Processmentioning

confidence: 99%

“…During the development of the equipment, special attention was paid to the design of the nozzle [24,25]. It forms a gas-powder jet and thus has determining effect on DLD process.…”

Section: Technology and Equipment Of Direct Laser Deposition Processmentioning

confidence: 99%

Theory and Technology of Direct Laser Deposition

Turichin¹,

Klimova-Korsmik²

2018

Additive Manufacturing of High-Performance Metals and Alloys - Modeling and Optimization

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Presently the additive technologies in manufacturing are widely developed in all industrialized countries. Replacing the traditional technology of casting and machining with additive technologies, one can significantly reduce material consumption and labor costs. They also allow obtaining products with desired properties. The most promising for manufacturing large-sized products is the additive technology of high-speed direct laser deposition. Using this technology allows to create complex parts and construction to one technological operation without using addition equipment and tools. This technology allows decreasing of consumption of raw materials and decrease amount of waste. Equipment for realization of DLD technology is universal and based on module design principle. DLD is based on layer-by-layer deposition and melting of powder by laser beam from using a sliced 3D computer-aided design (CAD) file. The materials used are powders based on Fe, Ni, and Ti. This chapter presents the results of machine design and research HS DLD technology from various materials.

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Hydrodynamic Instability in High-speed Direct Laser Deposition for Additive Manufacturing

Cited by 34 publications

References 8 publications

Computer Simulation of Hydrodynamic and Thermal Processes in DLD Technology

Computer Simulation of Hydrodynamic and Thermal Processes in DLD Technology

Laser cladding technological machine. Investigation of efficiency of various nozzles design

Theory and Technology of Direct Laser Deposition

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