Al/MWCNT Composite Layer Deposition on Aluminum Alloy Substrate by Selective Laser Melting and Flame Spray

2019 ◽  
Vol 141 (10) ◽  
Author(s):  
Laura Angélica Ardila-Rodríguez ◽  
Bruno Bellini Medeiros ◽  
Aline Capella de Oliveira ◽  
Dilermando Nagle Travessa
Keyword(s):  
Aluminum Alloy ◽  
Selective Laser Melting ◽  
Vickers Microhardness ◽  
Composite Layer ◽  
Multiwall Carbon Nanotubes ◽  
Flame Spray ◽  
X Ray Diffraction ◽  
Laser Melting ◽  
Layer Deposition ◽  
Hardness Values

Abstract This study compares two processing routes, selective laser melting (SLM) and flame spray (FS) to fabricate an Al/MWCNT composite layer over an aluminum alloy 6013 (AA6013) substrate. The final surface and cross section morphologies were evaluated by scanning electron microscopy (SEM) and optical microscopy (OM). The effect of these processing routes on the multiwall carbon nanotubes (MWCNT) was evaluated by X-ray diffraction (XRD) and Raman spectroscopy (RS). Finally, the mechanical properties were evaluated by Vickers microhardness. The Raman bands corresponding to carbon were identified in the spectrum of both samples processed by SLM and FS. However, the Al4C3 formation was also identified in the latter. The Vickers microhardness results show an increase in the hardness values of the FS and SLM processed coatings of 44% and 9%, respectively, when compared with the AA6013 substrate.

Liquation and Crystallization Cracks in Aluminum Alloy AA2024 during Selective Laser Melting

2021 ◽  
Vol 410 ◽  
pp. 203-208
Author(s):  
I.S. Loginova ◽  
N.A. Popov ◽  
A.N. Solonin
Keyword(s):  
Aluminum Alloy ◽  
Selective Laser Melting ◽  
Laser Scanning ◽  
Scanning Speed ◽  
Melting Zone ◽  
Alloying Elements ◽  
Laser Melting ◽  
Laser Scanning Speed ◽  
Positive Effect

In this work we studied the microstructure and microhardness of standard AA2024 alloy and AA2024 alloy with the addition of 1.5% Y after pulsed laser melting (PLM) and selective laser melting (SLM). The SLM process was carried out with a 300 W power and 0.1 m/s laser scanning speed. A dispersed microstructure without the formation of crystallization cracks and low liquation of alloying elements was obtained in Y-modified AA2024 aluminum alloy. Eutectic Al3Y and Al8Cu4Y phases were detected in Y-modified AA2024 aluminum alloy. It is led to a decrease in the formation of crystallization cracks The uniform distribution of alloying elements in the yttrium-modified alloy had a positive effect on the quality of the laser melting zone (LMZ) and microhardness.

scholarly journals Influence of the Manufacturing Parameters in Selective Laser Melting on Properties of Aluminum Alloy AlSi7Mg0.6 (A357)

2021 ◽  
Vol 45 (1) ◽  
pp. 1-10
Author(s):  
Arnold Mauduit ◽  
Hervé Gransac ◽  
Sébastien Pillot
Keyword(s):  
Aluminum Alloy ◽  
Theoretical Model ◽  
Selective Laser Melting ◽  
Chemical Elements ◽  
Laser Melting ◽  
Operating Modes ◽  
Melt Pool ◽  
Section Area ◽  
Maximum Temperatures ◽  
Conduction Mode

Various selective laser melting (SLM) configurations (8 in all) were tested on aluminum alloy AlSi7Mg0.6 by making single tracks on parallelepipeds specimens. We used an energy balance as a means of connecting the machine parameters (power, speed, etc.) of the 8 configurations to the morphology (geometry) of the single tracks. On this basis, we correlated the width, depth and especially the section area of the melt pool (single track) to the linear energy density. We were also able to assess the absorption coefficient of the aluminum alloy AlSi7Mg0.6 as a function of the temperature. The study was then focused on the microstructure and the possible impacts on the material properties including on the mechanical characteristics and the anisotropy observed in literature based on the build direction. Evidence suggests that the Hall-Petch relation can be used to explain this anisotropy. The thermal analysis highlighted two laser operating modes: the keyhole mode and the conduction mode. These modes have also been described via the morphology of the single tracks. Finally, a comparison between Rosenthal’s theoretical model (in the case of the conduction mode) and actual conditions was proposed by the obtained geometry of the single tracks as well as the cooling speeds calculated and measured using the dendrite arm spacing (DAS). The maximum temperatures achieved were also assessed by Rosenthal’s theoretical model which made it possible to explain the evaporation of some chemical elements during the manufacturing of the aluminum alloy through SLM.

scholarly journals Influence of Scanning Strategies on Processing of Aluminum Alloy EN AW 2618 Using Selective Laser Melting

Materials ◽  
2018 ◽  
Vol 11 (2) ◽  
pp. 298 ◽  
Author(s):  
Daniel Koutny ◽  
David Palousek ◽  
Libor Pantelejev ◽  
Christian Hoeller ◽  
Rudolf Pichler ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Selective Laser Melting ◽  
Laser Melting ◽  
Scanning Strategies

Study on Microstructure and Micro-Mechanical Properties of Porous Aluminum Alloy Fabricated by Selective Laser Melting

2016 ◽  
Vol 43 (4) ◽  
pp. 0403002 ◽  
Author(s):  
钱德宇 Qian Deyu ◽  
陈长军 Chen Changjun ◽  
张敏 Zhang Min ◽  
王晓南 Wang Xiaonan ◽  
敬和民 Jing Hemin
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Selective Laser Melting ◽  
Laser Melting ◽  
Porous Aluminum

Residual stress measurement techniques for Ti6Al4V parts fabricated using selective laser melting: state of the art review

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Ruben B.O. Acevedo ◽  
Klaudia Kantarowska ◽  
Edson Costa Santos ◽  
Marcio C. Fredel
Keyword(s):  
Residual Stress ◽  
Selective Laser Melting ◽  
Stress Measurement ◽  
State Of The Art ◽  
Measurement Techniques ◽  
Residual Stress Measurement ◽  
Hole Drilling ◽  
X Ray Diffraction ◽  
Laser Melting ◽  
Content Type

Purpose This paper aims to generate a review of available techniques to measure Residual Stress (RS) in Ti6Al4V components made by Ti6Al4V. Design/methodology/approach State of the art; literature review in the field of Residual Stress measurement of Ti6Al4V parts made by selective laser melting (SLM). Findings Different Residual Stress measurement techniques were detailed, regarding its concept, advantages and limitations. Regarding all researched references, hole drilling (semi destructive) and X-ray diffraction (nondestructive) were the most cited techniques for Residual Stress measurement of Ti6Al4V parts made by SLM. Originality/value An extensive analysis of RS measurement techniques for Ti6Al4V parts made by SLM.

scholarly journals Utilização da técnica de difração de raios-X para o estudo de amostras de Ti-6Al-4V forjadas e fabricadas por fusão seletiva a laser

2019 ◽  
Vol 40 ◽  
pp. 249
Author(s):  
Max Amorim Brum ◽  
Fábio Beck ◽  
Oreci Escobar da Silva ◽  
Gustavo Luiz Callegari ◽  
Marcos André Carara ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Selective Laser Melting ◽  
Structural Characteristics ◽  
Lattice Parameter ◽  
Manufacturing Processes ◽  
X Ray Diffraction ◽  
Laser Melting ◽  
Engineering Project ◽  
X Ray ◽  
Great Relevance

The search for materials with well-defined characteristics is very important for any engineering project. In addition, it is known that the various types of manufacturing processes directly influence in properties of the parts. In this work, the X-ray diffraction technique was used to study the structural characteristics of Ti-6Al-4V samples manufactured by the forging and Selective Laser Melting techniques. We found that the samples made by FSL were able to present a reduction of 1% in the lattice parameter perpendicular to the studied plane, when compared with the forged samples. Since most of the parts manufactured by Selective Laser Melting meet the demands of aeronautical and aerospace projects, where residual stresses are generally undesirable for making the parts more fragile, studies like these acquire great relevance.

scholarly journals Investigations on Mechanical Properties of Lattice Structures with Different Values of Relative Density Made from 316L by Selective Laser Melting (SLM)

2020 ◽  
Author(s):  
Paweł Płatek ◽  
Judyta Sienkiewicz ◽  
Jacek Janiszewski ◽  
Fengchun Jiang
Keyword(s):  
Relative Density ◽  
Selective Laser Melting ◽  
Dynamic Testing ◽  
Lattice Structure ◽  
Lattice Structures ◽  
X Ray Diffraction ◽  
Laser Melting ◽  
Geometrical Quality ◽  
Xrd Patterns ◽  
Dynamic Loading Conditions

Nine variants of regular lattice structures with different relative densities have been designed and successfully manufactured. The produced structures have been subjected to geometrical quality control, and the manufacturability of the implemented selective laser melting SLM technique has been assessed. It was found that the dimensions of the produced lattice struts differ from those of the designed struts. These deviations depend on the direction of geometrical evaluation. Additionally, the microstructures and phase compositions of the obtained structures were characterized and compared with those of conventionally produced 316L stainless steel. The microstructure analysis and X-Ray Diffraction XRD patterns revealed a single austenite phase in the SLM samples. Both a certain broadening and a displacement of the austenite peaks were observed due to residual stresses and a crystallographic texture induced by the SLM process. Furthermore, the mechanical behavior of the lattice structure material has been defined. It was demonstrated that under both quasi-static and dynamic testing, lattice structures with high relative densities are stretch-dominated, whereas those with low relative densities are bending-dominated. Moreover, the linear relationship between the energy absorption and relative density under dynamic loading conditions has been defined

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