Microstructure modelling of laser metal powder directed energy deposition of alloy 718

Kumara, Chamara; Segerstark, Andreas; Hanning, Fabian; Dixit, Nikhil; Joshi, Shrikant V.; Moverare, Johan; Nylén, Per

doi:10.1016/j.addma.2018.11.024

Cited by 52 publications

(42 citation statements)

References 24 publications

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“…This metallurgical phase is undesirable because it reduces ductility and tensile resistance [49]. All authors in the literature agree on the fact that additively manufactured parts contains these Laves phases that can be partially removed by performing a heat treatment [8,30,50,51].…”

Section: Laves Phasesmentioning

confidence: 99%

Plastic strain localization induced by microstructural gradient in laser cladding repaired structures

Guévenoux

Hallais

Balit

et al. 2020

Theoretical and Applied Fracture Mechanics

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Laser Cladding is an additive manufacturing technology well suited for the repair of complex metallic components. The repair is a two-step process: first, one removes the worn region and then, the initial geometry is reconstructed locally. The aim of this work is to study the influence of the microstructural gradient on the strain localization in repaired structures. More precisely, we perform in-situ SEM tensile tests completed by EBSD observations of the microstructure in the interface neighborhood between the base material and the repaired region. Furthermore, we monitor the evolution of the local plastic strain distribution at the grain level until failure. This is performed by Digital Image Correlation methods and superposition of grains contours and strain maps. The observations of grain size and plasticity are compared with predictions provided by a Hall-Petch model. The study emphasizes the importance of the microstructural gradient in the vicinity of reparation interface, more precisely it reveals that this gradient induce multiaxial strains and that the strain localization phenomenon is governed mainly by a grain size effect.

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Section: Laves Phasesmentioning

confidence: 99%

Plastic strain localization induced by microstructural gradient in laser cladding repaired structures

Guévenoux

Hallais

Balit

et al. 2020

Theoretical and Applied Fracture Mechanics

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“…Apart from the application of DED as a coating technique, this technology has intensively been employed as a manufacturing technology [4,42,43]. Over the past decade, DED could attract more attention regarding its capability in the fabrication of parts with complex geometries to near-net-shape, with the high cost and material savings.…”

Section: Directed Energy Deposition (Ded)mentioning

confidence: 99%

Application of Directed Energy Deposition-Based Additive Manufacturing in Repair

et al. 2019

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In the circular economy, products, components, and materials are aimed to be kept at the utility and value all the lifetime. For this purpose, repair and remanufacturing are highly considered as proper techniques to return the value of the product during its life. Directed Energy Deposition (DED) is a very flexible type of additive manufacturing (AM), and among the AM techniques, it is most suitable for repairing and remanufacturing automotive and aerospace components. Its application allows damaged component to be repaired, and material lost in service to be replaced to restore the part to its original shape. In the past, tungsten inert gas welding was used as the main repair method. However, its heat affected zone is larger, and the quality is inferior. In comparison with the conventional welding processes, repair via DED has more advantages, including lower heat input, warpage and distortion, higher cooling rate, lower dilution rate, excellent metallurgical bonding between the deposited layers, high precision, and suitability for full automation. Hence, the proposed repairing method based on DED appears to be a capable method of repairing. Therefore, the focus of this study was to present an overview of the DED process and its role in the repairing of metallic components. The outcomes of this study confirm the significant capability of DED process as a repair and remanufacturing technology.

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“…[68,77] These models allow more than one solid phase, e.g., to model precipitations in the interdendritic regions. [79] The PF method describes the evolution of the phase and the concentration field by using a coupled temperature model. The simplest coupling is to apply defined temperature conditions, like a constant undercooling, cooling rate or temperature gradient.…”

Section: Phase-field Modelmentioning

confidence: 99%

“…Once multi-phase PF methods are applied, it is also possible to predict additional phases during solidification like precipitates in the interdendritic regions. [79] The fine spatial resolution of the PF approach on the dendritic scale prevents the use on the part scale. In order to bridge these scales, there are two main approaches.…”

Section: Phase-field Modelmentioning

confidence: 99%

Modeling and Simulation of Microstructure Evolution for Additive Manufacturing of Metals: A Critical Review

Körner

Markl

Koepf

2020

Metall Mater Trans A

104

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Beam-based additive manufacturing (AM) of metallic components is characterized by extreme process conditions. The component forms in a line-by-line and layer-by-layer process over many hours. Locally, the microstructure evolves by rapid and directional solidification. Modeling and simulation is important to generate a better understanding of the resultant microstructure. Based on this knowledge, the AM process strategy can be adapted to adjust specific microstructures and in this way different mechanical properties. In this review, we explain the basic concepts behind different modeling approaches applied to simulate AM microstructure evolution of metals. After a critical discussion on the range of applicability and the predictive power of each model, we finally identify future tasks.

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Microstructure modelling of laser metal powder directed energy deposition of alloy 718

Cited by 52 publications

References 24 publications

Plastic strain localization induced by microstructural gradient in laser cladding repaired structures

Plastic strain localization induced by microstructural gradient in laser cladding repaired structures

Application of Directed Energy Deposition-Based Additive Manufacturing in Repair

Modeling and Simulation of Microstructure Evolution for Additive Manufacturing of Metals: A Critical Review

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