Laser Additive Manufacturing Processes for Near Net Shape Components

Riveiro, A.; Val, J. del; Comesaña, R.; Lusquiños, F.; Quintero, F.; Boutinguiza, M.; Pou, J.

doi:10.1007/978-3-030-10579-2_5

Cited by 26 publications

(18 citation statements)

References 221 publications

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“…The workpieces were produced using the additive manufacturing machine tool Mlab Cusing by ConceptLaser. 1 Figure 1 shows the interior view of the building volume during SLM as well as the exterior view of the Mlab Cusing. In addition, a list of technical specifications is provided.…”

Section: Additive Manufacturingmentioning

confidence: 99%

“…The layer thickness was set to S D = 25 μm during the variation of the hatch spacing. 1 Naming of specific manufacturers is done solely for the sake of completeness and does not necessarily imply an endorsement of the named companies nor that the products are necessarily the best for the purpose. The contour and the support structures were exposed with a laser power of P = 60 W and a scanning speed of v S = 600 mm/s, detached from the layer thickness of the respective process parameter combination.…”

Section: Additive Manufacturingmentioning

confidence: 99%

“…After SLM, the samples were mechanically removed from the platform. The as-build surface roughness was evaluated over a distance of l n = 4 mm (λ c = 0.8 mm) using the stylus instrument MarSurf M300 by Mahr GmbH 1 . For statistical verification, three measurements were carried out for each sample, both at the surface perpendicular to the build-up direction (XY-plane) and at a surface parallel to the build-up direction (YZ-, XZ-plane).…”

Section: Workpiece Characterizationmentioning

confidence: 99%

“…After the completion of the non-destructive measurements, the samples were prepared for the microhardness measurements. For this purpose, cross sections were prepared at the center of the sample using the Mecatome T210 precision cutting machine 1 . During separation, the thermal-mechanical load was kept low by choosing a low feed rate (u f = 0.03 mm/ min) and assuring constant cooling.…”

Section: Workpiece Characterizationmentioning

confidence: 99%

“…Due to the rapid and cost-efficient production of small batches and the freedom of design, additive manufacturing (AM), especially selective laser melting (SLM), is increasingly used in industry [1][2][3][4]. In this process, the component is built layer by layer from a metal powder bed [5].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Selective laser melting (SLM) of AISI 316L—impact of laser power, layer thickness, and hatch spacing on roughness, density, and microhardness at constant input energy density

Greco

Gutzeit

Hotz

et al. 2020

Int J Adv Manuf Technol

100

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In selective laser melting (SLM) the variation of process parameters significantly impacts the resulting workpiece characteristics. In this study, AISI 316L was manufactured by SLM with varying laser power, layer thickness, and hatch spacing. Contrary to most studies, the input energy density was kept constant for all variations by adjusting the scanning speed. The varied parameters were evaluated at two different input energy densities. The investigations reveal that a constant energy density with varying laser parameters results into considerable differences of the workpieces' roughness, density, and microhardness. The density and the microhardness of the manufactured components can be improved by selecting appropriate parameters of the laser power, the layer thickness, and the hatch spacing. For this reason, the input energy density alone is no indicator for the resulting workpiece characteristics, but rather the ratio of scanning speed, layer thickness, or hatch spacing to laser power. Furthermore, it was found that the microhardness of an additively manufactured material correlates with its relative density. In the parameter study presented in this paper, relative densities of the additively manufactured workpieces of up to 99.9% were achieved.

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Section: Additive Manufacturingmentioning

confidence: 99%

Section: Additive Manufacturingmentioning

confidence: 99%

Section: Workpiece Characterizationmentioning

confidence: 99%

Section: Workpiece Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Selective laser melting (SLM) of AISI 316L—impact of laser power, layer thickness, and hatch spacing on roughness, density, and microhardness at constant input energy density

Greco

Gutzeit

Hotz

et al. 2020

Int J Adv Manuf Technol

100

View full text Add to dashboard Cite

show abstract

Influence of microstructural defects and the surface topography on the fatigue behavior of “additively‐subtractively” manufactured specimens made of AISI 316L

Blinn

Greco

Smaga

et al. 2021

Materialwissenschaft Werkst

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As additive manufacturing offers only low surface quality, a subsequent machining of functional and highly loaded areas is required. Thus, a sound knowledge of the interrelation between the additive and subtractive manufacturing process as well as the resulting mechanical properties is indispensable. In this work, specimens were manufactured by using laser‐based powder bed fusion (L‐PBF) with substantially different sets of process parameters as well as subsequent grinding (G) or milling (M). Despite the substantially different surface topographies, the fatigue tests revealed only a slight influence of the subtractive manufacturing on the fatigue behavior, whereas the different laser‐based powder bed fusion process parameters led to pronounced changes in fatigue strength. In contrast, a significant influence of subtractive finishing on the fatigue properties of the defect‐free continuously cast (CC) reference specimens was observed. This can be explained by a dominating influence of process‐induced defects in laser‐based powder bed fusion material, which overruled the influence of surface machining. However, although both laser‐based powder bed fusion parameter sets resulted in substantial defects, one set yielded similar fatigue strength compared to continuously cast specimens.

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An Overview on Additive Manufacturing of Duplex Stainless Steels: Microstructure, Mechanical Properties, Corrosion Resistance, Postheat Treatment, and Future Perspectives

Karunanithi,

Arasappan,

Nallathambi

2024

steel research int.

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Additive manufacturing (AM) is a cutting‐edge technique for constructing intricate components with unique microstructural features and strength comparable to wrought alloys. Due to their exceptional corrosion resistance and mechanical properties, duplex stainless steels (DSS) are used in a wide range of critical applications. Over the past several years, a substantial body of research has been conducted on the AM of DSS. In‐depth knowledge is required to understand the complete benefits of the AM process. This review overviews the AM‐processed DSS parts based on process‐specific microstructural changes, mechanical behavior, electrochemical performance, and postheat treatment processes based on the classifications of directed energy deposition and powder bed fusion AM techniques along with future perspectives. Major challenges in AM of DSS are optimizing the austenite–ferrite fractions and controlling the formations of deleterious phases. This review will be extensively useful to researchers and industries working in the AM of DSS.

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Laser Additive Manufacturing Processes for Near Net Shape Components

Cited by 26 publications

References 221 publications

Selective laser melting (SLM) of AISI 316L—impact of laser power, layer thickness, and hatch spacing on roughness, density, and microhardness at constant input energy density

Selective laser melting (SLM) of AISI 316L—impact of laser power, layer thickness, and hatch spacing on roughness, density, and microhardness at constant input energy density

Influence of microstructural defects and the surface topography on the fatigue behavior of “additively‐subtractively” manufactured specimens made of AISI 316L

An Overview on Additive Manufacturing of Duplex Stainless Steels: Microstructure, Mechanical Properties, Corrosion Resistance, Postheat Treatment, and Future Perspectives

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