Modeling of Heat and Mass Transfer in the Laser-Plasma Method of Direct Powder Deposition

IF 0.5 Q4 PHYSICS, CONDENSED MATTER
D. V. Bedenko, O. B. Kovalev
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引用次数: 0

Abstract

For the direct laser-plasma powder cladding method, the temperature distributions and surface profiles of deposited layers from a steel micro powder on the flat sample are numerically investigated. The deposition is performed using various scanning strategies of the laser system—with oscillations in a sinusoidal curve, circular, elliptical or figure-eight trajectories with constant linear motion, for both single and multi-layer beads. Numerical modeling of the problem is carried out taking into account the heat and mass transfer processes in a region containing moving curvilinear boundaries occurring during the gas-jet feed of powder particles into the melt pool created by laser-plasma action. Effective trajectories and frequencies of the periodical oscillations of the laser beam were discovered, at which the amount of cladded powder is maximal, and the resulting beads have a smooth symmetrical shape. It’s shown that this occurs due to flexible and precise control of the melt pool size and shape, when it best corresponds to the profile of the powder particles flow. As the result, the model allows determining the optimal regimes of laser-plasma cladding, ensuring the highest powder utilization coefficient and the absence of excessive substrate overheating, simultaneously.

Abstract Image

激光-等离子体直接粉末沉积法中的传热和传质建模
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来源期刊
CiteScore
0.90
自引率
25.00%
发文量
144
审稿时长
3-8 weeks
期刊介绍: Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques publishes original articles on the topical problems of solid-state physics, materials science, experimental techniques, condensed media, nanostructures, surfaces of thin films, and phase boundaries: geometric and energetical structures of surfaces, the methods of computer simulations; physical and chemical properties and their changes upon radiation and other treatments; the methods of studies of films and surface layers of crystals (XRD, XPS, synchrotron radiation, neutron and electron diffraction, electron microscopic, scanning tunneling microscopic, atomic force microscopic studies, and other methods that provide data on the surfaces and thin films). Articles related to the methods and technics of structure studies are the focus of the journal. The journal accepts manuscripts of regular articles and reviews in English or Russian language from authors of all countries. All manuscripts are peer-reviewed.
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