Contour laser strategy and its benefits for lattice structure manufacturing by selective laser melting technology

Vrána, Radek; Jaroš, Jan; Koutný, Daniel; Nosek, Jakub; Zikmund, Tomáš; Kaiser, Jozef; Paloušek, David

doi:10.1016/j.jmapro.2021.12.006

Cited by 29 publications

(22 citation statements)

References 35 publications

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“…It shows that the real struts are smaller than the nominal value in this direction. The explanation could be in the short circular laser paths during lattice structure production, as was described in the paper [28]. When the laser moves on the circular path, the outer area of the melt pool moves on a larger diameter than in the middle of the strut, the actual laser speed is higher, and the SLM input energy lower.…”

Section: Influence Of the Selection Sphere Diametermentioning

confidence: 97%

“…This transition area, with a strut diameters up to 1.0 mm and SLM laser strategy changes, could affect the lattice structure dimensional accuracy. The solution can be choosing only the contour laser strategy, as presented in the paper [28]. From the pictures and results in Figure 9, it is obvious that the strut's cross-section area is most closely represented by the elliptic element.…”

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confidence: 99%

“…It is caused by the change of the laser strategy from contour to contour-hatch within the default SLM parameters. The solution may be to use the contour laser strategy, as presented in the paper [28].…”

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confidence: 99%

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Deviations of the SLM Produced Lattice Structures and Their Influence on Mechanical Properties

et al. 2022

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Selective laser melting (SLM) is an additive manufacturing technology suitable for producing cellular lattice structures using fine metal powder and a laser beam. However, the shape and dimensional deviations occur on the thin struts during manufacturing, influencing the mechanical properties of the structure. There are attempts in the literature to describe the actual shape of the struts’ geometry, however, on a smaller data sample only, and there is a lack of a universal FEA material model applicable to a wider range of lattice structure diameters. To describe the actual dimensions of the struts, a set of lattice structures, with diameters ranging from 0.6 to 3.0 mm, were manufactured using SLM. These samples were digitized using micro-computed tomography (μCT) and fully analyzed for shape and dimensions. The results show large deviations in diameters of inscribed and circumscribed cylinders, indicating an elliptical shape of the struts. With increasing lattice structure diameter, the deviations decreased. In terms of the effect of the shape and dimensions on the mechanical properties, the Gaussian cylinder was found to describe struts in the diameter range of 1.5 to 3.0 mm sufficiently well. For smaller diameters, it is appropriate to represent the actual cross-section by an ellipse. The use of substitute ellipses, in combination with the compression test results, has resulted in FEA material model that can be used for the 0.6 to 3.0 mm struts’ diameter range. The model has fixed Young’s and tangential modules for these diameters and is controlled only by the yield strength parameter (YST).

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Section: Influence Of the Selection Sphere Diametermentioning

confidence: 97%

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confidence: 99%

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Deviations of the SLM Produced Lattice Structures and Their Influence on Mechanical Properties

et al. 2022

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“…The mechanical performance of the negative Poisson's ratio structure [55] on the beam-based reentry structure with V-shaped cross-linking makes the lateral instability of the wall variant of the building larger, which has a new development direction for the manufacturing and performance of the re-entry structure made of additive materials. The default bending scanning strategy [56] of AlSi10mg material is changed to the contour-scanning strategy, and its main SLM process parameters are developed. The developed parameters are used to describe the differences in the lattice structure between the vertical and inclined pillars during SLM.…”

Section: Process Parameters and Characteristic Level Of Representationmentioning

confidence: 99%

Considerations for the Variable Density Lattice Structure of Additive Manufacturing: A Review

et al. 2022

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In recent decades, the additive manufacturing technology has made great progress in software and methods in various fields, and gradually explored in a deeper and broader manner. It has changed from the mature homogenized lattice type and model design to a non-uniform direction. It has also started to improve from the aspects of material innovation, additive manufacturing printing technology, etc., to change the additive manufacturing technology and control parameters in the manufacturing process, Furthermore, the model or part can be improved to have better mechanical properties, such as stiffness, strength and wear resistance, which provides an important research methodology for the better development of this direction. These aspects include the software used, the type of structural analysis, the software used and verification, as well as the methods applied in the study of variable density lattices and the application and verification of improved research methods. In addition, there are density design optimization, variable density lattice design and lattice geometric characteristics’ design in geometric topology optimization design. The expected design of the model or part at the design level has reached the ideal model or part, which provides both a framework and ideas for the future research direction of non-uniform lattice design and a broader field of application, and will promote the future research and development prospects of variable density lattices.

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“…[42] Especially, SLM technology can produce complex metallic parts with dimensional accuracy of 0.05-0.1 mm. [43][44][45][46] Meanwhile, Ti and its alloys fabricated by SLM technology have shown comparable or superior mechanical properties in comparison with the counterparts fabricated by conventional manufacturing methods. [47][48][49] Due to the advantages of SLM technology in forming accuracy and mechanical properties, porous Ti and its alloy implants fabricated by SLM have attracted considerable attention in the past decade.…”

Section: Introductionmentioning

confidence: 99%

Surface Modification of Porous Titanium and Titanium Alloy Implants Manufactured by Selective Laser Melting: A Review

Liu,

Li,

Wang

et al. 2023

Adv Eng Mater

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Titanium (Ti) and its alloy implants with porous structure manufactured by selective laser melting (SLM) can match elastic modulus of human bone to reduce the stress‐shielding effect and satisfy the personalized requirement in orthopedic surgery. Compared with conventional casting and forging Ti and its alloy implants, SLM implants possess unique microstructural features and excellent comprehensive mechanical properties. However, the un‐melted powder particles inevitably adhere to the surfaces of SLM implants, which may result in excessive surface roughness and potential health risks. Moreover, there are significant issues encountered, such as bioactivity, toxicity, antibacterial activity, corrosion and wear resistance. Consequently, surface modification methods are essential to remove the un‐melted powder particles and improve biological and mechanical properties of SLM implants. Herein, the research efforts focus exclusively on chemical (acid treatment, alkali treatment, sol‐gel, chemical vapor deposition and atomic layer deposition) and electrochemical methods (anodization and microarc oxidation) for SLM Ti and its alloy implants, especially for porous structures. Particularly, the characteristics of these methods are summarized, and their commonly used pre‐ and post‐treatment methods are introduced. In addition, the development trends and challenges in surface modification of SLM Ti and its alloy implants are discussed.This article is protected by copyright. All rights reserved.

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Contour laser strategy and its benefits for lattice structure manufacturing by selective laser melting technology

Cited by 29 publications

References 35 publications

Deviations of the SLM Produced Lattice Structures and Their Influence on Mechanical Properties

Deviations of the SLM Produced Lattice Structures and Their Influence on Mechanical Properties

Considerations for the Variable Density Lattice Structure of Additive Manufacturing: A Review

Surface Modification of Porous Titanium and Titanium Alloy Implants Manufactured by Selective Laser Melting: A Review

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