Controlling interdependent meso-nanosecond dynamics and defect generation in metal 3D printing

doi:10.1126/science.aay7830

GSTDTAP > 气候变化

DOI	10.1126/science.aay7830
	Controlling interdependent meso-nanosecond dynamics and defect generation in metal 3D printing
	Saad A. Khairallah; Aiden A. Martin; Jonathan R. I. Lee; Gabe Guss; Nicholas P. Calta; Joshua A. Hammons; Michael H. Nielsen; Kevin Chaput; Edwin Schwalbach; Megna N. Shah; Michael G. Chapman; Trevor M. Willey; Alexander M. Rubenchik; Andrew T. Anderson; Y. Morris Wang; Manyalibo J. Matthews; Wayne E. King
	2020-05-08
发表期刊	Science
出版年	2020
英文摘要	Laser powder bed fusion is an additive manufacturing technique that laser-melts powder layer by layer to build a three-dimensional (3D) part. Khairallah et al. used experiments and a multiphysics model to determine the origin of the melt spatter and defect formation that degrade the properties of built parts (see the Perspective by Polonsky and Pollock). Informed modulation of laser power is important to avoid disturbing the powder bed and creating laser shadowing. This reduces pore formations and leads to more uniform properties of 3D-printed parts. Science , this issue p. [660][1]; see also p. [583][2] State-of-the-art metal 3D printers promise to revolutionize manufacturing, yet they have not reached optimal operational reliability. The challenge is to control complex laser–powder–melt pool interdependency (dependent upon each other) dynamics. We used high-fidelity simulations, coupled with synchrotron experiments, to capture fast multitransient dynamics at the meso-nanosecond scale and discovered new spatter-induced defect formation mechanisms that depend on the scan strategy and a competition between laser shadowing and expulsion. We derived criteria to stabilize the melt pool dynamics and minimize defects. This will help improve build reliability. [1]: /lookup/doi/10.1126/science.aay7830 [2]: /lookup/doi/10.1126/science.abb4938
领域	气候变化 ; 资源环境
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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/249829
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Saad A. Khairallah,Aiden A. Martin,Jonathan R. I. Lee,et al. Controlling interdependent meso-nanosecond dynamics and defect generation in metal 3D printing[J]. Science,2020.
APA	Saad A. Khairallah.,Aiden A. Martin.,Jonathan R. I. Lee.,Gabe Guss.,Nicholas P. Calta.,...&Wayne E. King.(2020).Controlling interdependent meso-nanosecond dynamics and defect generation in metal 3D printing.Science.
MLA	Saad A. Khairallah,et al."Controlling interdependent meso-nanosecond dynamics and defect generation in metal 3D printing".Science (2020).