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DOI | 10.1126/science.aav4687 |
Keyhole threshold and morphology in laser melting revealed by ultrahigh-speed x-ray imaging | |
Cunningham, Ross1; Zhao, Cang2; Parab, Niranjan2; Kantzos, Christopher1; Pauza, Joseph1; Fezzaa, Kamel2; Sun, Tao2; Rollett, Anthony D.1 | |
2019-02-22 | |
发表期刊 | SCIENCE
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ISSN | 0036-8075 |
EISSN | 1095-9203 |
出版年 | 2019 |
卷号 | 363期号:6429页码:849-+ |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | We used ultrahigh-speed synchrotron x-ray imaging to quantify the phenomenon of vapor depressions (also known as keyholes) during laser melting of metals as practiced in additive manufacturing. Although expected from welding and inferred from postmortem cross sections of fusion zones, the direct visualization of the keyhole morphology and dynamics with high-energy x-rays shows that (i) keyholes are present across the range of power and scanning velocity used in laser powder bed fusion; (ii) there is a well-defined threshold from conduction mode to keyhole based on laser power density; and (iii) the transition follows the sequence of vaporization, depression of the liquid surface, instability, and then deep keyhole formation. These and other aspects provide a physical basis for three-dimensional printing in laser powder bed machines. |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000459387100039 |
WOS关键词 | POWDER-BED FUSION ; ABSORPTIVITY ; PENETRATION ; DYNAMICS ; STEEL ; TIME ; FLOW |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/200811 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Carnegie Mellon Univ, Dept Mat Sci & Engn, 5000 Forbes Ave, Pittsburgh, PA 15213 USA; 2.Argonne Natl Lab, Xray Sci Div, 9700 S Cass Ave, Lemont, IL USA |
推荐引用方式 GB/T 7714 | Cunningham, Ross,Zhao, Cang,Parab, Niranjan,et al. Keyhole threshold and morphology in laser melting revealed by ultrahigh-speed x-ray imaging[J]. SCIENCE,2019,363(6429):849-+. |
APA | Cunningham, Ross.,Zhao, Cang.,Parab, Niranjan.,Kantzos, Christopher.,Pauza, Joseph.,...&Rollett, Anthony D..(2019).Keyhole threshold and morphology in laser melting revealed by ultrahigh-speed x-ray imaging.SCIENCE,363(6429),849-+. |
MLA | Cunningham, Ross,et al."Keyhole threshold and morphology in laser melting revealed by ultrahigh-speed x-ray imaging".SCIENCE 363.6429(2019):849-+. |
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