Manufatura Aditiva de Aço Inoxidável 316L por Fusão Seletiva a Laser

Montuori, Riccardo Augusto Moreira; Figueira, Gustavo; Cataldi, Thiago Pacagnan; Alcântara, Nelson Guedes de; Bolfarini, Claudemiro; Coelho, Reginaldo Teixeira; Gargarella, Piter

doi:10.1590/0104-9224/si25.30

Cited by 4 publications

(8 citation statements)

References 39 publications

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“…The lowest densification obtained (90.30%) corresponds to the sample deposited with 40.28 J/mm 3 (116 W and 1200 mm/s), the lowest VED analyzed. A comparison between this data with results published in the literature for gas atomized AISI 316L stainless steel processed in the same L-PBF machine 11 , show that the feedstock morphology (water atomized powder) strongly influenced the densification results, reducing the apparent density of the as-built samples.…”

Section: Resultsmentioning

confidence: 56%

“…The distribution is mono-modal and is mostly between 15 and 45 µm, which is an ideal particle size range for the L-PBF process 5,10,11 . Particles show an irregular morphology, characteristic of the water atomization process 17,18 .…”

Section: Resultsmentioning

confidence: 99%

“…25 samples (dimensions 10x10x5 mm 3 ) were produced varying the laser power (116,147,173,190, and 226 W) and the scanning speeds (600, 450, 900, 1050, and 1200 mm/s) to determine the optimal processing conditions. The other process parameters were kept constant and were selected based on values already optimized for gas atomized AISI 316L powders 11 : layer thickness (30 µm), overlapping (80 µm), powder bed without prior heating, and bidirectional scanning strategy of 5 mm long strokes with 67° rotation between layers.…”

Section: Methodsmentioning

confidence: 99%

“…The cost per ton of the water atomized powder is up to 10 times lower than the gas atomized, due to the production scale and the lack of expensive consumables such as argon gas 9 . AISI 316L austenitic stainless steel is one of the most widely used alloys in the L-PBF process due to its high corrosion resistance and good weldability, as well as one of the best materials used for structural finishing applications 10,11 . In the standard L-PBF process of AISI 316L stainless steel, the use of gas atomized powder as feedstock has been extensively explored 2,10,12,13 .…”

Section: Introductionmentioning

confidence: 99%

“…Selected samples were subjected to microstructural characterization by optical and scanning electron microscopy, as well as X-ray diffraction. The results obtained were compared with results published in the literature for gas atomized AISI 316L stainless steel processed in the same L-PBF equipment 11 .…”

Section: Introductionmentioning

confidence: 99%

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Effect of Hot Isostatic Pressing of Water Atomized AISI 316L Manufactured by Laser Powder Bed Fusion

et al. 2023

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The objective of this work is to study the possibility of obtaining dense parts using water atomized AISI 316L steel powder in the L-PBF process. Despite its irregular, non-spherical, particle morphology, it has a significantly lower cost. 25 samples were produced varying the laser power and the scanning speeds to determine the optimal processing conditions. Additionally, hot isostatic pressing (HIP) was performed after the L-PBF process to further increase densification. Selected samples were subjected to microstructural characterization. The best densification results obtained were for the sample produced with the laser power of 173 W and scanning speed of 600 mm/s, where densifications close to 98% were obtained. HIP post-processing promoted increased densification of samples with closed porosity, allowing samples with densification above 95% to reach values close to 100%. HIP did not promote the closure of open pores. The results indicate that the use of water atomized AISI 316L in the L-PBF process combined with post-processing by HIP can produce dense engineering components and at the same time reduce the production costs of the manufactured components, mainly because it is a lower cost raw material when compared to the commonly used feedstock obtained by gas atomization.

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Section: Resultsmentioning

confidence: 56%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of Hot Isostatic Pressing of Water Atomized AISI 316L Manufactured by Laser Powder Bed Fusion

et al. 2023

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A comprehensive investigation on application of machine learning for optimization of process parameters of laser powder bed fusion-processed 316L stainless steel

Eshkabilov

Ara

Azarmi

2022

Int J Adv Manuf Technol

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Metal 3D printing has gained a lot of attention among industries since it offers a practical solution to problems rising during manufacturing of parts and components with complex geometry. This is an additive technology that eliminated several fabrication steps and at the same time reduces material waste during manufacturing process. However, in all additive manufacturing technologies, the final properties of the parts are determined by the operational process parameters. In this study, several machine learning algorithms were examined to characterize the effects of the printing process parameters on relative density, hardness, yield strength, and tensile strength in manufactured parts. It was possible by using "Big Data" collected from a large number of previously published articles on application of Laser Powder Bed Fusion (LPBF) for 3D printing of 316L stainless steel samples. Among different process parameters, laser power, laser energy density, and scanning speed were proven to have the largest effects directly on physical and mechanical properties of LPBF processed parts. Six different classification models and five support vector machine regression-based models were tested to find the most accurate prediction algorithm. To validate the obtained results from the applied machine learning models, a set of 316L specimens were produced using LPBF technology using a random set of process parameters. The physical and mechanical properties of 3D printed samples were tested and compared to the ones those predicted from the optimum models from machine learning analysis. The results were in great agreement, which shows the high accuracy of the developed machine learning algorithms in this study.

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Laser Additive Manufacturing of 316L Stainless Steel Thin-wall Ring Parts

Zhao¹,

Tian²,

Liu³

et al. 2023

Fluid Dynamics &Amp; Materials Processing

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The process parameters of laser additive manufacturing have an important influence on the forming quality of the produced items or parts. In the present work, a finite element model for simulating transient heat transfer in such processes has been implemented using the ANSYS software, and the temperature and stress distributions related to 316L stainless steel thin-walled ring parts have been simulated and analyzed. The effect of the laser power, scanning speed, and scanning mode on temperature distribution, molten pool structure, deformation, and stress field has been studied. The simulation results show that the peak temperature, weld pool size, deformation, and residual stress increase with an increase in laser power and a decrease in the scanning speed. The scanning mode has no obvious effect on temperature distribution, deformation, and residual stress. In addition, a forming experiment was carried out. The experimental results show that the samples prepared by laser power P = 800 W, V = 6 mm/s, and the normal scanning method display good quality, whereas the samples prepared under other parameters have obvious defects. The experimental findings are consistent with the simulation results.

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Manufatura Aditiva de Aço Inoxidável 316L por Fusão Seletiva a Laser

Cited by 4 publications

References 39 publications

Effect of Hot Isostatic Pressing of Water Atomized AISI 316L Manufactured by Laser Powder Bed Fusion

Effect of Hot Isostatic Pressing of Water Atomized AISI 316L Manufactured by Laser Powder Bed Fusion

A comprehensive investigation on application of machine learning for optimization of process parameters of laser powder bed fusion-processed 316L stainless steel

Laser Additive Manufacturing of 316L Stainless Steel Thin-wall Ring Parts

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