Improving Productivity in the Laser Powder Bed Fusion of Inconel 718 by Increasing Layer Thickness: Effects on Mechanical Behavior

Paradise, Paul; Patil, Dhiraj B.; Handel, Nicole Van; Saxena, Anushree; Bruce, Daniel; Suder, Austin; Clonts, Shawn; Shinde, Mandar; Noe, Cameron; Godfrey, Donald G.; Hota, Rakesh; Bhate, Dhruv

doi:10.1007/s11665-022-06961-8

Cited by 11 publications

(1 citation statement)

References 36 publications

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“…Studies that are already using approaches to increase the productivity of PBF-LB are known from the literature [12][13][14][15][16]. Leicht et al [14] enhanced the productivity by increasing the layer thickness from 20 µm to 80 µm, resulting in a relative density higher than 99.9% and good tensile strengths, but a slight decrease in yield strength.…”

Section: Introductionmentioning

confidence: 99%

Influence of PBF-LB Process Atmosphere on the Fatigue Strength of Hot Isostatically Post-Densified Duplex Steel Parts Produced via the Shell Core Approach

et al. 2023

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Laser-based additive manufacturing is a great manufacturing technology for producing parts of any geometry. To also increase the strength and reliability of parts produced via powder bed fusion with laser beam (PBF-LB), hot isostatic pressing (HIP) is often used to densify residual porosity or lack-of-fusion defects. When components are post-densified via HIP, they do not require a high density beforehand, only a closed porosity or a dense shell. By building up samples with increased porosity, the PBF-LB process can be accelerated and productivity increased. HIP post-treatment gives the material its full density and good mechanical properties. However, with this approach, the influence of the process gases becomes important. Either argon or nitrogen is used in the PBF-LB process. It is assumed that these process gases are trapped in the pores and thus have an influence on the HIP process and also the mechanical properties after HIP. In this study, the influence of argon and nitrogen as process gases on the properties of duplex AISI 318LN steel after powder bed fusion with laser beam and hot isostatic pressing is investigated for the case of very high initial porosities.

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Section: Introductionmentioning

confidence: 99%

Influence of PBF-LB Process Atmosphere on the Fatigue Strength of Hot Isostatically Post-Densified Duplex Steel Parts Produced via the Shell Core Approach

et al. 2023

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Sustainable production of AlSi10Mg parts by laser powder bed fusion process

Mercurio

Calignano

Iuliano

2023

Int J Adv Manuf Technol

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Laser powder bed fusion (L-PBF) is an additive manufacturing technology that allows producing complex and lightweight parts without the use of specific tooling during the building process. However, despite continuous developments, some problems limit its use in series production. To introduce these systems in mass production, it is necessary to solve the problems and exceed the limits related to the requirements of industrialization: higher productivity, less material consumption, less over-production, and less waste, greater stability of the process, and higher quality of the final components. In this study, good practices to reduce resource consumption are presented. The production rate of the L-PBF technique was increased to produce AlSi10Mg alloy components. All the samples were manufactured with 90-µm-layer thickness increasing productivity by approximately 65%. A design of experiments (DOE) method was used to analyze the effect of process parameters on the densification percentage. The produced samples were observed with a non-destructive process, the X-ray computed tomography system, to detect the presence of defects and pores. It has been found that a combination of parameters can induce porosities with a morphology such that after stress relieving the density increases rather than decreases as has been widely discussed in the literature. The mechanical properties are comparable with the literature values for conventional technologies. Good values of as-built surface roughness were also achieved despite the layer thickness.

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Comprehensive review on residual stress control strategies in laser-based powder bed fusion process– Challenges and opportunities

Kumar

Jebaraj

2023

Lasers Manuf. Mater. Process.

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Improving Productivity in the Laser Powder Bed Fusion of Inconel 718 by Increasing Layer Thickness: Effects on Mechanical Behavior

Cited by 11 publications

References 36 publications

Influence of PBF-LB Process Atmosphere on the Fatigue Strength of Hot Isostatically Post-Densified Duplex Steel Parts Produced via the Shell Core Approach

Influence of PBF-LB Process Atmosphere on the Fatigue Strength of Hot Isostatically Post-Densified Duplex Steel Parts Produced via the Shell Core Approach

Sustainable production of AlSi10Mg parts by laser powder bed fusion process

Comprehensive review on residual stress control strategies in laser-based powder bed fusion process– Challenges and opportunities

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