scholarly journals An instrument for in situ time-resolved X-ray imaging and diffraction of laser powder bed fusion additive manufacturing processes

2018 ◽  
Vol 89 (5) ◽  
pp. 055101 ◽  
Author(s):  
Nicholas P. Calta ◽  
Jenny Wang ◽  
Andrew M. Kiss ◽  
Aiden A. Martin ◽  
Philip J. Depond ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Manufacturing Processes ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Time Resolved ◽  
Powder Bed ◽  
X Ray ◽  
X Ray Imaging

scholarly journals In Situ Analysis of Laser Powder Bed Fusion Using Simultaneous High-Speed Infrared and X-ray Imaging

JOM ◽  
2020 ◽  
Vol 73 (1) ◽  
pp. 201-211 ◽  
Author(s):  
Benjamin Gould ◽  
Sarah Wolff ◽  
Niranjan Parab ◽  
Cang Zhao ◽  
Maria Cinta Lorenzo-Martin ◽  
...  
Keyword(s):  
High Speed ◽  
In Situ Analysis ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
X Ray ◽  
X Ray Imaging

scholarly journals Cooling dynamics of two titanium alloys during laser powder bed fusion probed with in situ X-ray imaging and diffraction

2020 ◽  
Vol 195 ◽  
pp. 108987
Author(s):  
Nicholas P. Calta ◽  
Vivek Thampy ◽  
Duncan R.C. Lee ◽  
Aiden A. Martin ◽  
Rishi Ganeriwala ◽  
...  
Keyword(s):  
Titanium Alloys ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
X Ray ◽  
X Ray Imaging

scholarly journals In situ Characterization of Laser Powder Bed Fusion Using High-Speed Synchrotron X-ray Imaging Technique

2019 ◽  
Vol 25 (S2) ◽  
pp. 2566-2567 ◽  
Author(s):  
Niranjan Parab ◽  
Cang Zhao ◽  
Ross Cunningham ◽  
Luis I. Escano ◽  
Kamel Fezzaa ◽  
...  
Keyword(s):  
High Speed ◽  
Imaging Technique ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
In Situ Characterization ◽  
Powder Bed ◽  
X Ray ◽  
X Ray Imaging

scholarly journals Pressure dependence of the laser-metal interaction under laser powder bed fusion conditions probed by in situ X-ray imaging

2020 ◽  
Vol 32 ◽  
pp. 101084 ◽  
Author(s):  
Nicholas P. Calta ◽  
Aiden A. Martin ◽  
Joshua A. Hammons ◽  
Michael H. Nielsen ◽  
Tien T. Roehling ◽  
...  
Keyword(s):  
Pressure Dependence ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
X Ray ◽  
Metal Interaction ◽  
X Ray Imaging

scholarly journals In situ synchrotron X-ray imaging of 4140 steel laser powder bed fusion

Materialia ◽  
2019 ◽  
Vol 6 ◽  
pp. 100306 ◽  
Author(s):  
Andrew Bobel ◽  
Louis G. Hector ◽  
Isaac Chelladurai ◽  
Anil K. Sachdev ◽  
Tyson Brown ◽  
...  
Keyword(s):  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
X Ray ◽  
X Ray Imaging

scholarly journals Ultrafast X-ray imaging of laser–metal additive manufacturing processes

2018 ◽  
Vol 25 (5) ◽  
pp. 1467-1477 ◽  
Author(s):  
Niranjan D. Parab ◽  
Cang Zhao ◽  
Ross Cunningham ◽  
Luis I. Escano ◽  
Kamel Fezzaa ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
High Speed ◽  
Large Scale ◽  
Manufacturing Processes ◽  
Powder Bed ◽  
X Ray ◽  
Melt Pool ◽  
X Ray Imaging ◽  
Resolution Imaging

The high-speed synchrotron X-ray imaging technique was synchronized with a custom-built laser-melting setup to capture the dynamics of laser powder-bed fusion processes in situ. Various significant phenomena, including vapor-depression and melt-pool dynamics and powder-spatter ejection, were captured with high spatial and temporal resolution. Imaging frame rates of up to 10 MHz were used to capture the rapid changes in these highly dynamic phenomena. At the same time, relatively slow frame rates were employed to capture large-scale changes during the process. This experimental platform will be vital in the further understanding of laser additive manufacturing processes and will be particularly helpful in guiding efforts to reduce or eliminate microstructural defects in additively manufactured parts.

scholarly journals Laser powder bed fusion additive manufacturing of copper wicking structures: fabrication and capillary characterization

2021 ◽  
Author(s):  
Adnen Mezghani
Keyword(s):  
Additive Manufacturing ◽  
Performance Analysis ◽  
Heat Pipes ◽  
Manufacturing Processes ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Published Report ◽  
Secondary Manufacturing ◽  
Design Freedom

PurposeAn integral component in heat pipes (HPs) and vapor chambers (VCs) is a porous wicking structure. Traditional methods for manufacturing wicking structures within HPs and VCs involve secondary manufacturing processes and are generally limited to simple geometries. This work aims to leverage the unprecedented level of design freedom of laser powder bed fusion (LPBF) additive manufacturing (AM) to produce integrated wicking structures for HPs and VCs.Design/methodology/approachCopper wicking structures are fabricated through LPBF via partial sintering and via the formation of square, hexagonal and rectangular arrangements of micro-pins and micro-grooves, produced in multiple build directions. Wicks are characterized by conducting capillary performance analysis through the measurement of porosity, permeability and capillary rate-of-rise.FindingsCopper wicking structures were successfully fabricated with capillary performance, K/reff, ranging from 0.186–1.74 µm. The rectangular-arrangement micro-pin wick presented the highest performance.Originality/valueThis work represents the first published report on LPBF AM of copper wicking structures for HPs/VCs applications and represents foundational knowledge for fabricating complete assemblies of copper VCs and HPs through LPBF AM.

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