Simulation of laser beam cladding by powder injection

Lepski, D.; Eichler, Hans-Joachim; Scharek, S.; Fux, V.; Nowotny, Steffen; Beyer, Eckhard

doi:10.1109/cleoe.2003.1313630

Cited by 4 publications

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“…Based on previous work on the simulation of laser cladding (Ref [22][23][24][25], a three-dimensional transient finite element model is developed that is able to improve our knowledge of the influence of process parameters and material properties on the evolution of stress and inelastic strain in laser cladding.…”

Section: State Of the Artmentioning

confidence: 99%

“…A series of closed models, that regard most of the interrelated processes in laser cladding such as preheating of the powder particles crossing the laser beam and the related beam attenuation, the powder resorption by the melt pool, and the evolution of temperature field and bead geometry, were published during the last few years (Ref [21][22][23][24][25][26][27][28][29][30][31].…”

Section: State Of the Artmentioning

confidence: 99%

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Modeling the Influence of Process Parameters and Additional Heat Sources on Residual Stresses in Laser Cladding

2007

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In laser cladding thermal contraction of the initially liquid coating during cooling causes residual stresses and possibly cracks. Preweld or postweld heating using inductors can reduce the thermal strain difference between coating and substrate and thus reduce the resulting stress. The aim of this work is to better understand the influence of various thermometallurgical and mechanical phenomena on stress evolution and to optimize the induction-assisted laser cladding process to get crack-free coatings of hard materials at high feed rates. First, an analytical one-dimensional model is used to visualize the most important features of stress evolution for a Stellite coating on a steel substrate. For more accurate studies, laser cladding is simulated including the powder-beam interaction, the powder catchment by the melt pool, and the self-consistent calculation of temperature field and bead shape. A three-dimensional finite element model and the required equivalent heat sources are derived from the results and used for the transient thermomechanical analysis, taking into account phase transformations and the elastic-plastic material behavior with strain hardening. Results are presented for the influence of process parameters such as feed rate, heat input, and inductor size on the residual stresses at a single bead of Stellite coatings on steel.

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Section: State Of the Artmentioning

confidence: 99%

Section: State Of the Artmentioning

confidence: 99%

Modeling the Influence of Process Parameters and Additional Heat Sources on Residual Stresses in Laser Cladding

2007

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Laser Cladding

Lepski

Brückner

2009

Springer Series in Materials Science

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Laser Cladding

Brückner

Lepski

2017

The Theory of Laser Materials Processing

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Laser cladding is a modern technology whose uses include, for example, the creation of protective coatings to reduce wear and corrosion on engine parts and tools. The process is now also often used for the purpose of Additive Manufacturing to fabricate whole parts layer-by-layer. The aircraft and automotive industries are examples of industries in which it is much employed. This account considers the theory of a number of aspects of the process in detail. The first to be studied is the interaction of the laser beam directly with the powder that is being deposited; the effects of gravity, beam shadowing, and particle heating are investigated. This is followed by a discussion of themechanisms by which the particles adhere to the surface of the work piece and are absorbed into it. In order to understand the process, a study of the melt pool and the associated temperature distribution is necessary; it is then possible to infer the final bead geometry. An inevitable consequence of a thermal process such as laser cladding is the induced thermal stress and resulting distortion of the work piece. The fundamentals are discussed, a numerical model presented and in addition a simple heuristic model is given. The use of induction-assisted laser cladding as a means of preventing the formation of cracks is discussed

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Simulation of laser beam cladding by powder injection

Cited by 4 publications

References 0 publications

Modeling the Influence of Process Parameters and Additional Heat Sources on Residual Stresses in Laser Cladding

Modeling the Influence of Process Parameters and Additional Heat Sources on Residual Stresses in Laser Cladding

Laser Cladding

Laser Cladding

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