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Cracking in laser additively manufactured W: Initiation mechanism and a suppression approach by alloying
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Number of Authors: 62019 (English)In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 162, p. 384-393Article in journal (Refereed) Published
Abstract [en]

Cracking represents the main challenge for exploiting tungsten in additive manufacturing. In this study, laser powder-bed-fusion technique was applied to additively manufacture tungsten. In the built bulks, the grain boundaries were found to be rich in nanoscale gas pores. On the basis of that, a nanopore segregation induced cracking initiation mechanism was proposed. In order to control cracks, W-6wt.%Ta alloy was produced and the cracking suppression mechanism was investigated. The W-6Ta alloy is characterized by a submicron intragranular cellular structure, which composed large amount of interlocked dislocations as revealed by transmission electron microscopy. Owing to the cellular structure, the nanopores were trapped inside grains, which can reduce the cracking possibility. Moreover, the W-Ta alloy possesses higher strength (by 17%) and higher energy dissipation rate (by 52%) than pure tungsten, which both are beneficial for crack reduction.

Place, publisher, year, edition, pages
2019. Vol. 162, p. 384-393
Keywords [en]
Additive manufacturing, W, W-Ta alloy, Cracking mechanism, Cellular structure
National Category
Materials Engineering Materials Chemistry
Identifiers
URN: urn:nbn:se:su:diva-163823DOI: 10.1016/j.matdes.2018.12.010ISI: 000454128400038OAI: oai:DiVA.org:su-163823DiVA, id: diva2:1277302
Available from: 2019-01-10 Created: 2019-01-10 Last updated: 2019-01-10Bibliographically approved

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Shen, Zhijian
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Department of Materials and Environmental Chemistry (MMK)
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