Spheroidisation of metal powder by pulsed electron beam irradiation.
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| Title: | Spheroidisation of metal powder by pulsed electron beam irradiation. |
|---|---|
| Authors: | Murray, J.W.1 (AUTHOR) james.murray@nottingham.ac.uk, Simonelli, M.1 (AUTHOR), Speidel, A.1 (AUTHOR), Grant, D.M.1 (AUTHOR), Clare, A.T.1 (AUTHOR) |
| Source: | Powder Technology. May2019, Vol. 350, p100-106. 7p. |
| Subjects: | Electron beams, Metal powders, Stress waves, Irradiation, Grain refinement, Transmission electron microscopy |
| 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 μm 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 μm beneath the surface, with a substantially reduced grain size from ca. 2 μm 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. Unlabelled Image • Metal powder spheroidisation by pulsed electron beam was demonstrated for the first time on Stellite 6. • Sa roughness was reduced from 218 to 95.7 nm. • Irradiation causes rotation and hence uniform smoothing. • Basic flowability energy was reduced from 627 to 583 mJ. • Conditioned bulk density was increased to 4.57 g/ml after irradiation from 4.33 [ABSTRACT FROM AUTHOR] |
| Copyright of Powder Technology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 136088203 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Spheroidisation of metal powder by pulsed electron beam irradiation. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Murray%2C+J%2EW%2E%22">Murray, J.W.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> james.murray@nottingham.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Simonelli%2C+M%2E%22">Simonelli, M.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Speidel%2C+A%2E%22">Speidel, A.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Grant%2C+D%2EM%2E%22">Grant, D.M.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Clare%2C+A%2ET%2E%22">Clare, A.T.</searchLink><relatesTo>1</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Powder+Technology%22">Powder Technology</searchLink>. May2019, Vol. 350, p100-106. 7p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Electron+beams%22">Electron beams</searchLink><br /><searchLink fieldCode="DE" term="%22Metal+powders%22">Metal powders</searchLink><br /><searchLink fieldCode="DE" term="%22Stress+waves%22">Stress waves</searchLink><br /><searchLink fieldCode="DE" term="%22Irradiation%22">Irradiation</searchLink><br /><searchLink fieldCode="DE" term="%22Grain+refinement%22">Grain refinement</searchLink><br /><searchLink fieldCode="DE" term="%22Transmission+electron+microscopy%22">Transmission electron microscopy</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: 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 μm 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 μm beneath the surface, with a substantially reduced grain size from ca. 2 μm 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. Unlabelled Image • Metal powder spheroidisation by pulsed electron beam was demonstrated for the first time on Stellite 6. • Sa roughness was reduced from 218 to 95.7 nm. • Irradiation causes rotation and hence uniform smoothing. • Basic flowability energy was reduced from 627 to 583 mJ. • Conditioned bulk density was increased to 4.57 g/ml after irradiation from 4.33 [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Powder Technology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.powtec.2019.03.041 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 7 StartPage: 100 Subjects: – SubjectFull: Electron beams Type: general – SubjectFull: Metal powders Type: general – SubjectFull: Stress waves Type: general – SubjectFull: Irradiation Type: general – SubjectFull: Grain refinement Type: general – SubjectFull: Transmission electron microscopy Type: general Titles: – TitleFull: Spheroidisation of metal powder by pulsed electron beam irradiation. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Murray, J.W. – PersonEntity: Name: NameFull: Simonelli, M. – PersonEntity: Name: NameFull: Speidel, A. – PersonEntity: Name: NameFull: Grant, D.M. – PersonEntity: Name: NameFull: Clare, A.T. IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 05 Text: May2019 Type: published Y: 2019 Identifiers: – Type: issn-print Value: 00325910 Numbering: – Type: volume Value: 350 Titles: – TitleFull: Powder Technology Type: main |
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