A new method for assessing the recyclability of powders within Powder Bed Fusion process

Simple item page
dc.contributor.authorGorji, Nima E.
dc.contributor.authorSaxena, Prateek
dc.contributor.authorCorfield, Martin R.
dc.contributor.authorClare, Adam
dc.contributor.authorRueff, Jean-Pascal
dc.contributor.authorBogan, Justin
dc.contributor.authorGonzález, Pierre G.M.
dc.contributor.authorSnelgrove, Matthew
dc.contributor.authorHughes, Greg
dc.contributor.authorO'Connor, Robert
dc.contributor.authorRaghavendra, Ramesh
dc.contributor.authorBrabazon, Dermot C.
dc.date.accessioned2020-03-06T11:51:33Z
dc.date.available2020-03-06T11:51:33Z
dc.date.issued2020-01-29
dc.description.abstractRecycling metallic powders used in the additive manufacturing (AM) process is essential for reducing the process cost, manufacturing time, energy consumption, and metallic waste. In this paper, the focus is on pore formation in recycled powder particles of stainless steel 316L during the selective laser melting process. We have introduced the concept of optimizing the powder bed's printing area in order to see the extent of the affected powders during the 3D-printing process. X-ray Computed Tomography (XCT) is used to characterize the pores inside the particles. The results from image processing of the tomography (rendered in 3D format) indicate a broader pore size distribution and a higher pore density in recycled powders compared to their virgin counterparts. To elucidate on this, the Electron Dispersion spectroscopy (EDX) analysis and Synchrotron-based Hard X-ray Photoelectron Spectroscopy (HAXPES) were performed to reveal the chemical composition distribution across the pore area and bulk of the recycled powder particles. Higher concentrations of Fe, Cr, and Ni were recorded on the interior wall of the pore in recycled particles and higher Mn, S and Si concentrations were recorded in the outer layer around the pore area and on the surface of the recycled particle. The pore formation in recycled powder is attributed to out-diffusion of Mn, S and Si to the outer surface as a result of the incident laser heat during the AM process due to higher electron affinity of such metallic elements to oxygenation. HAXPES analysis shows a higher MnO concentration around the pore area which impedes the in-diffusion of other elements into the bulk and thereby helps to creates a void. The inside wall of the pore area (dendrites), has a higher concentration of Fe and Cr oxide. We believe the higher pore density in recycled powders is due, at least in part to composition redistribution, promoted by laser heat during the AM process. Nanoindentation analyses on both virgin and recycled powder particles shows a lower hardness and higher effective modulus in the recycled powder particles attributed to the higher porosity in recycled powders.en_UK
dc.identifier.citationGorji NE, Saxena P, Corfield M, et al., (2020) A new method for assessing the recyclability of powders within Powder Bed Fusion process. Materials Characterization, Volume 161, March 2020, Article number 110167en_UK
dc.identifier.issn1044-5803
dc.identifier.urihttps://doi.org/10.1016/j.matchar.2020.110167
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/15244
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectAdditive manufacturingen_UK
dc.titleA new method for assessing the recyclability of powders within Powder Bed Fusion processen_UK
dc.typeArticleen_UK

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
assessing_the_recyclability_of_powders-2020.pdf
Size:
2.61 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.63 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

Staff publications (SATM)