Cracking in laser additively manufactured W: Initiation mechanism and a suppression approach by alloying

Cracking in laser additively manufactured W : Initiation mechanism and a suppression approach by alloying

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.

Wang, Zhimin (author)
Li, Kailun (author)
Ma, Jing (author)
Liu, Wei (author)
Shen, ZhijianStockholms universitet,Institutionen för material- och miljökemi (MMK),Tsinghua University, China(Swepub:su)shen (author)
Stockholms universitetInstitutionen för material- och miljökemi (MMK) (creator_code:org_t)

By the author/editor: Wang, Dianzheng; Wang, Zhimin; Li, Kailun; Ma, Jing; Liu, Wei; Shen, Zhijian

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NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Materials Chemis ...

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