Surface Coatings and Surface Modification Techniques for Additive Manufacturing

Kumaravelu, P.; Arulvel, S.; Kandasamy, Jayakrishna

doi:10.1007/978-3-030-89401-6_10

Cited by 4 publications

(2 citation statements)

References 41 publications

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“…Chen et al point out that among all AM processes, the selective laser melting process has gained attention for its ability to provide extreme precision of work, leading researchers to adapt SLM for producing functionally graded lattice structures. However, SLM's presence of residual stress and roughness affects deformation, considering that the primary constituents of lattice structures are struts or pores [33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of 3d Printed Functionally Graded Lattice Structures

Medisetty,

Darvekar

2023

Preprint

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Additive Manufacturing (AM) is a layer-by-layer fabrication method using 3D CAD designs. It has enabled the production of Lattice structures (arrangements of unit cells representing crystal lattices). Functionally Graded Lattice Structures (FGLS) with varying relative density for targeted properties are gaining research interest. This study explored mechanical properties such as strength, stress-strain relations, deformation behaviour, and energy absorption in lattice structures. CAD software Creo Parametric 9.0 was utilized to model five distinct 3D lattice designs employing novel approaches like different unit cells and pattern arrangements. Fifteen Lattice Structure Samples made of Nylon PA 2200 were fabricated through Selective Laser Sintering (SLS), and compression tests were conducted for experimental analysis. Numerical analysis was performed using ANSYS-19 software and results were compared with the experimental results. Distinct deformation behaviour was observed for FGLS compared to Uniform lattice structures (UB). Among all lattice structures, uniform and bidirectional graded lattice structures with strong middle layer exhibited the highest yield strength, while Variable Pattern FGLS displayed the lowest. Similarly, bidirectional graded lattice structure with weak middle layer showcased the best plateau region performance. Hybrid FGLS demonstrated the largest energy absorption, three times that of the variable pattern lattice structure. The results tabulated could be useful to guide future research and applications based on specific property requirements. This study showcases the potential of AM to create lattice structures with tailored mechanical properties, advancing their utilization in various industries.

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Section: Introductionmentioning

confidence: 99%

Design and Analysis of 3d Printed Functionally Graded Lattice Structures

Medisetty,

Darvekar

2023

Preprint

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“…Опорно-поворотный узел подвижного состава: 1 -сменный диск; 2 -рама с подпятником Модификация поверхностей функциональными покрытиями является хорошо проверенным методом повышения износостойкости узлов, работающих в сложных условиях -при высоких нагрузках, отсутствии или перебоях в подаче смазки в зону трения, в агрессивно-абразивных средах и т. п. [7][8][9][10][11][12][13].…”

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Wear Reduction in Heavily Loaded Units of Transport Vehicles

Demyanov,

Shcherbakov

2023

Safety of Technogenic and Natural Systems

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Introduction. The pivot assembly provides connection between the rotating and non-rotating parts of machines and mechanisms such as cranes, excavators, trailers, railway rolling stocks. In relation to rolling stock, it connects the load-carrying part of the car with the bogie and is one of the most critical and wear-out friction units. Its technical condition affects the intensity and form of wear of the surfaces themselves, the amount of resistance to rotation of the bogie when the car moves in curved sections of the track, the amplitude of the lateral rocking of the car, the intensity of wear of the wheel flanges and, as a consequence, the safety of operation of the rolling stock as a whole. Until now, periodic grease is used for this unit, which, even with a short mileage, manages to be squeezed out of the contact zones and, thereby, creates conditions for the predominance of dry friction. Until now, various proposals to solve this problem have not found application in mass production for a number of reasons, and therefore the search for ways to reduce wear in the pivot assembly of cars is still relevant. This study proposes a solution to this problem that does not require structural changes to the pivot assembly itself. The aim of this work was to develop a technologically advanced anti-friction coating with good adhesion, which will be applied to the surface of a replaceable disk installed between the rubbing surfaces of the pivot assembly during scheduled repairs of the car chassis. This approach will reduce the friction force and wear rate in the unit when lubrication shortage occurs due to squeezing out of the grease. Materials and Methods. Antifriction characteristics of the developed coating was observed on a friction machine providing specific loads on the test sample up to 5000 N and a sliding speed from 0.13 m/s. The samples were examined by scanning electron microscopy (FEI Quanta 200 microscope). SEM images were acquired in a back-scattered electron (BSE) mode using a semiconductor detector. To analyze the elemental composition of beam samples, an energy dispersive spectrometer (EDAX Element EDS system) was used. Results. A three-layer functional phosphorus-containing composite coating of the surfaces of the unit was developed, which made it possible to significantly reduce the coefficient of friction and, as a consequence, the intensity of wear of the pivot unit surface during dry friction. The optimal conditions for obtaining composite coating layers were determined. The influence of the thickness of each layer and the conditions for its production on its functional characteristics was studied. Discussion and Conclusion. The proposed solution is manufacturable and, with appropriate adaptation, can be used to reduce wear in any open pivot assembly without radically changing its design. The methods for producing coating layers are accessible and technologically advanced for serial use.

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Detonation Spraying of a Cermet Coating to Improve the Surface Properties of Tool Steel Parts Produced by the Selective Laser Melting Process

Sathishkumar,

Arumaikkannu

2023

J Therm Spray Tech

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Surface Coatings and Surface Modification Techniques for Additive Manufacturing

Cited by 4 publications

References 41 publications

Design and Analysis of 3d Printed Functionally Graded Lattice Structures

Design and Analysis of 3d Printed Functionally Graded Lattice Structures

Wear Reduction in Heavily Loaded Units of Transport Vehicles

Detonation Spraying of a Cermet Coating to Improve the Surface Properties of Tool Steel Parts Produced by the Selective Laser Melting Process

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