J.W. Murray
Spheroidisation of metal powder by pulsed electron beam irradiation
Murray, J.W.; Simonelli, M.; Speidel, A.; Grant, D.M.; Clare, A.T.
Authors
MARCO SIMONELLI MARCO.SIMONELLI@NOTTINGHAM.AC.UK
Assistant Professor
A. Speidel
D.M. Grant
ADAM CLARE adam.clare@nottingham.ac.uk
Professor of Manufacturing Engineering
Abstract
A new powder spheroidisation process has been demonstrated using a large-area, pulsed electron beam technique. This was used to dramatically improve the surface morphology of Stellite 6 metal powder. Powder surface asperities up to 20??m size can be eliminated by melting and incorporation into the near-surface of the particle. Surface finish is significantly improved. Agitation and rotation of particles due to a beam-induced stress wave enables the irradiation of multiples sides of particles, resulting in uniformly smoothed particles after sufficient pulses. Elemental analysis revealed no measurable contamination as a result of the process. Transmission electron microscopy showed a dense layer is produced within a zone up to 3??m beneath the surface, with a substantially reduced grain size from ca. 2??m diameter in the bulk to ca. 40?nm. Elemental homogenisation also was accompanied by grain refinement. The irradiated Stellite 6 showed a reduced basic flowability energy (583?mJ compared to 627?mJ for the untreated), explained by reduced particle-particle cohesion and interlocking, and an increased conditioned bulk density of 4.57?g/ml compared to 4.33?g/ml due to satellite/asperity reduction.
Citation
Murray, J., Simonelli, M., Speidel, A., Grant, D., & Clare, A. (2019). Spheroidisation of metal powder by pulsed electron beam irradiation. Powder Technology, 350, 100-106. https://doi.org/10.1016/j.powtec.2019.03.041
Journal Article Type | Article |
---|---|
Acceptance Date | Mar 23, 2019 |
Online Publication Date | Mar 26, 2019 |
Publication Date | May 15, 2019 |
Deposit Date | Nov 14, 2019 |
Publicly Available Date | Mar 27, 2020 |
Journal | Powder Technology |
Print ISSN | 0032-5910 |
Electronic ISSN | 1873-328X |
Publisher | Elsevier |
Peer Reviewed | Peer Reviewed |
Volume | 350 |
Pages | 100-106 |
DOI | https://doi.org/10.1016/j.powtec.2019.03.041 |
Keywords | General Chemical Engineering |
Public URL | https://nottingham-repository.worktribe.com/output/3285557 |
Publisher URL | https://www.sciencedirect.com/science/article/pii/S0032591019302165 |
Additional Information | This article is maintained by: Elsevier; Article Title: Spheroidisation of metal powder by pulsed electron beam irradiation; Journal Title: Powder Technology; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.powtec.2019.03.041; Content Type: article; Copyright: © 2019 Elsevier B.V. All rights reserved. |
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