Effect of build location on microstructural characteristics and corrosion behavior of EB-PBF built Alloy 718

Karimi, Paria; Sadeghimeresht, Esmaeil; Ålgårdh, Joakim; Harlin, Peter; Andersson, Joel

doi:10.1007/s00170-019-04859-9

Cited by 17 publications

(1 citation statement)

References 37 publications

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“…This is vital to the study as it shows that the voids are linked to the process parameters alone and were independent of the location on the build plate. This need not be the case if the location-dependent thermal history influenced the void content as was observed in [ 24 ]. In an earlier study, the same EOS M290 equipment was used to manufacture samples of Alloy 247LC [ 25 ].…”

Section: Resultsmentioning

confidence: 99%

Influence of Laser Powder Bed Fusion Process Parameters on Voids, Cracks, and Microhardness of Nickel-Based Superalloy Alloy 247LC

et al. 2020

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The manufacturing of parts from nickel-based superalloy Alloy 247LC by laser powder bed fusion (L-PBF) is challenging, primarily owing to the alloy’s susceptibility to cracks. Apart from the cracks, voids created during the L-PBF process should also be minimized to produce dense parts. In this study, samples of Alloy 247LC were manufactured by L-PBF, several of which could be produced with voids and crack density close to zero. A statistical design of experiments was used to evaluate the influence of the process parameters, namely laser power, scanning speed, and hatch distance (inherent to the volumetric energy density) on void formation, crack density, and microhardness of the samples. The window of process parameters, in which minimum voids and/or cracks were present, was predicted. It was shown that the void content increased steeply at a volumetric energy density threshold below 81 . The crack density, on the other hand, increased steeply at a volumetric energy density threshold above 163 . The microhardness displayed a relatively low value in three samples which displayed the lowest volumetric energy density and highest void content. It was also observed that two samples, which displayed the highest volumetric energy density and crack density, demonstrated a relatively high microhardness; which could be a vital evidence in future investigations to determine the fundamental mechanism of cracking. The laser power was concluded to be the strongest and statistically most significant process parameter that influenced void formation and microhardness. The interaction of laser power and hatch distance was the strongest and most significant factor that influenced the crack density.

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Section: Resultsmentioning

confidence: 99%

Influence of Laser Powder Bed Fusion Process Parameters on Voids, Cracks, and Microhardness of Nickel-Based Superalloy Alloy 247LC

et al. 2020

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Friction deposition additive manufacturing of alloy 718: Effect of post-heat treatment on microstructures and mechanical properties

Santiagu,

Ramachandran,

Gangaraju

et al. 2023

Int J Adv Manuf Technol

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Robust Metal Additive Manufacturing Process Selection and Development for Aerospace Components

Gradl

Tinker

Park

et al. 2022

J. of Materi Eng and Perform

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Metal additive manufacturing (AM) encapsulates the myriad of manufacturing processes available to meet industrial needs. Determining which of these AM processes is best for a specific aerospace application can be overwhelming. Based on the application, each of these AM processes has advantages and challenges. The most common metal AM methods in use include Powder Bed Fusion, Directed Energy Deposition, and various solid-state processes. Within each of these processes, there are different energy sources and feedstock requirements. Component requirements heavily affect the process determination, despite existing literature on these AM processes (often inclusive of input parameters and material properties). This article provides an overview of the considerations taken for metal AM process selection for aerospace components based on various attributes. These attributes include geometric considerations, metallurgical characteristics and properties, cost basis, post-processing, and industrialization supply chain maturity. To provide information for trade studies and selection, data on these attributes were compiled through literature reviews, internal NASA studies, as well as academic and industry partner studies and data. These studies include multiple AM components and sample build experiments to evaluate (1) material and geometric variations and constraints within the processes, (2) alloy characterization and mechanical testing, (3) pathfinder component development and hot-fire evaluations, and (4) qualification approaches. This article summarizes these results and is meant to introduce various considerations when designing a metal AM component.

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Effect of build location on microstructural characteristics and corrosion behavior of EB-PBF built Alloy 718

Cited by 17 publications

References 37 publications

Influence of Laser Powder Bed Fusion Process Parameters on Voids, Cracks, and Microhardness of Nickel-Based Superalloy Alloy 247LC

Influence of Laser Powder Bed Fusion Process Parameters on Voids, Cracks, and Microhardness of Nickel-Based Superalloy Alloy 247LC

Friction deposition additive manufacturing of alloy 718: Effect of post-heat treatment on microstructures and mechanical properties

Robust Metal Additive Manufacturing Process Selection and Development for Aerospace Components

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