scholarly journals Understanding Part to Part Variability During Directed Energy Deposition Processes Using In Situ and Ex Situ Process Characterization

2018 ◽  
Author(s):  
Niyanth Sridharan ◽  
Justin S. Baba ◽  
Brian H. Jordan ◽  
Ralph Barton Dinwiddie ◽  
Ryan R. Dehoff
Keyword(s):  
Energy Deposition ◽  
Ex Situ ◽  
Directed Energy Deposition ◽  
Process Characterization ◽  
Deposition Processes ◽  
Directed Energy

In-situ monitoring of melt pool images for porosity prediction in directed energy deposition processes

2018 ◽  
Vol 51 (5) ◽  
pp. 437-455 ◽  
Author(s):  
Mojtaba Khanzadeh ◽  
Sudipta Chowdhury ◽  
Mark A. Tschopp ◽  
Haley R. Doude ◽  
Mohammad Marufuzzaman ◽  
...  
Keyword(s):  
Energy Deposition ◽  
In Situ Monitoring ◽  
Melt Pool ◽  
Directed Energy Deposition ◽  
Deposition Processes ◽  
Directed Energy

Precipitation behavior of Nb-Si-based in-situ composite manufactured by laser directed energy deposition

2022 ◽  
Vol 207 ◽  
pp. 114288
Author(s):  
Yunlong Li ◽  
Xin Lin ◽  
Yunlong Hu ◽  
Wentao Yan ◽  
Jerry Ying Hsi Fuh ◽  
...  
Keyword(s):  
Energy Deposition ◽  
Precipitation Behavior ◽  
In Situ Composite ◽  
Directed Energy Deposition ◽  
Directed Energy

scholarly journals A novel method to prevent cracking in directed energy deposition of Inconel 738 by in-situ doping Inconel 718

2021 ◽  
Vol 197 ◽  
pp. 109214
Author(s):  
Xiaoqiang Zhang ◽  
Ze Chai ◽  
Huabin Chen ◽  
Jijin Xu ◽  
Luming Xu ◽  
...  
Keyword(s):  
Inconel 718 ◽  
Energy Deposition ◽  
Directed Energy Deposition ◽  
Novel Method ◽  
Directed Energy

A review on in situ monitoring technology for directed energy deposition of metals

2020 ◽  
Vol 108 (11-12) ◽  
pp. 3437-3463 ◽  
Author(s):  
Zi-jue Tang ◽  
Wei-wei Liu ◽  
Yi-wen Wang ◽  
Kaze Mojtaba Saleheen ◽  
Zhi-chao Liu ◽  
...  
Keyword(s):  
Energy Deposition ◽  
In Situ Monitoring ◽  
Monitoring Technology ◽  
Directed Energy Deposition ◽  
Directed Energy

scholarly journals Acoustic emissions in directed energy deposition processes

2022 ◽  
Author(s):  
Tobias Hauser ◽  
Raven T. Reisch ◽  
Tobias Kamps ◽  
Alexander F. H. Kaplan ◽  
Joerg Volpp
Keyword(s):  
Additive Manufacturing ◽  
Laser Beam ◽  
Energy Deposition ◽  
Process Analysis ◽  
Acoustic Emissions ◽  
Air Pressure ◽  
Directed Energy Deposition ◽  
Deposition Processes ◽  
Directed Energy ◽  
Wire Arc Additive Manufacturing

AbstractAcoustic emissions in directed energy deposition processes such as wire arc additive manufacturing and directed energy deposition with laser beam/metal are investigated within this work, as many insights about the process can be gained from this. In both processes, experienced operators can hear whether a process is running stable or not. Therefore, different experiments for stable and unstable processes with common process anomalies were carried out, and the acoustic emissions as well as process camera images were captured. Thereby, it was found that stable processes show a consistent mean intensity in the acoustic emissions for both processes. For wire arc additive manufacturing, it was found that by the Mel spectrum, a specific spectrum adapted to human hearing, the occurrence of different process anomalies can be detected. The main acoustic source in wire arc additive manufacturing is the plasma expansion of the arc. The acoustic emissions and the occurring process anomalies are mainly correlating with the size of the arc because that is essentially the ionized volume leading to the air pressure which causes the acoustic emissions. For directed energy deposition with laser beam/metal, it was found that by the Mel spectrum, the occurrence of an unstable process can also be detected. The main acoustic emissions are created by the interaction between the powder and the laser beam because the powder particles create an air pressure through the expansion of the particles from the solid state to the liquid state when these particles are melted. These findings can be used to achieve an in situ quality assurance by an in-process analysis of the acoustic emissions.

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