期刊
MATERIALS & DESIGN
卷 162, 期 -, 页码 384-393出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2018.12.010
关键词
Additive manufacturing; W; W-Ta alloy; Cracking mechanism; Cellular structure
资金
- National Magnetic Confinement Fusion Science Program of China [2014GB117000]
- National Natural Science Foundation of China [U1605243]
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. (C) 2018 Published by Elsevier Ltd.
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