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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ali, M. A. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Tian, Yingtao
Lancaster University
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (8/8 displayed)
- 2019Effect of processing parameters on the densification, microstructure and crystallographic texture during the laser powder bed fusion of pure tungstencitations
- 2016Laser polishing - Enhancing surface quality of additively manufactured cobalt chrome and titanium components
- 2016Process Optimization of Dual-Laser Beam Welding of Advanced Al-Li Alloys Through Hot Cracking Susceptibility Modelingcitations
- 2011Investigation of high speed micro-bump formation through electrodeposition enhanced by megasonic agitationcitations
- 2009Megasonic agitation for enhanced electrodeposition of coppercitations
- 2009Megasonic agitation for enhanced electrodeposition of coppercitations
- 2009High density indium bumping using electrodeposition enhanced by megasonic agitationcitations
- 2008Megasonic enhanced wafer bumping process to enable high density electronics interconnectioncitations
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article
Effect of processing parameters on the densification, microstructure and crystallographic texture during the laser powder bed fusion of pure tungsten
Abstract
Laser Powder Bed Fusion is a leading additive manufacturing technology, which has been used successfully with a range of lower melting point materials (titanium alloys, nickel alloys, steels). This work looks to extend its use to refractory metals, such as those considered in this paper where the behaviour of pure tungsten powder is investigated. A strategy for fabricating high density parts was developed by creating a process map in which the effect of laser energy density was studied. The process quality was assessed using different techniques including light optical microscopy, XCT, SEM and EBSD. The results showed that the laser energy density was adequate to process tungsten to produce functional parts. The bulk density and optically determined densities, under different process conditions, ranged from 94 to 98%, but there was evidence of micro cracks and defects in specimens due to micro- and macro-scale residual stress. Analysis of the microstructure and local crystallographic texture showed that the melt pool formed under the laser beam favoured solidification in a preferred orientation by an epitaxial growth mechanism. The EBSD local texture analysis of the tungsten specimens showed a <111>//Z preferential fibre texture, parallel to the build direction.