Critical instability at moving keyhole tip generates porosity in laser melting

Autor:	Tao Sun, Anthony D. Rollett, Wenda Tan, Niranjan D. Parab, Kamel Fezzaa, Cang Zhao, Xuxiao Li
Rok vydání:	2020
Předmět:	010302 applied physics Fusion Multidisciplinary Materials science 02 engineering and technology Mechanics Acoustic wave 021001 nanoscience & nanotechnology Laser 01 natural sciences Instability law.invention law 0103 physical sciences Powder bed 0210 nano-technology Porosity Melt pool Keyhole
Zdroj:	Science. 370:1080-1086
ISSN:	1095-9203 0036-8075
DOI:	10.1126/science.abd1587
Popis:	Driving the pores away The formation of “keyholes” (vapor-filled depressions) during additive manufacturing leads to porosity, which degrades alloy performance, especially fracture properties, and remains a big challenge for the 3D printing of metals. Zhao et al. used high-speed x-ray imaging to take a detailed look at how keyhole formation connects to porosity in a titanium alloy. They found that instability at the keyhole tip drives pores away to get trapped in the solidification front. Understanding this process and the operating parameters under which it occurs provides a roadmap for avoiding porosity and building high-quality metal parts. Science , this issue p. 1080
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fc2b66355c690e7cc1005012384450c1 https://doi.org/10.1126/science.abd1587 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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