TY - JOUR
T1 - Modeling and experimental analysis of energy attenuation and partitioning during laser based direct energy deposition
AU - Liu, Zhichao
AU - Wang, Xinlin
AU - Wuest, Thorsten
AU - Zhang, Hong Chao
N1 - Funding Information:
The authors would like to extend the acknowledgements to the Foundation of the Benjamin M. Startler College of Engineering and the Office of Vice President for Research at West Virginia University.
Publisher Copyright:
© 2020 The Authors. Published by Elsevier B.V.
PY - 2020
Y1 - 2020
N2 - Energy attenuation and partitioning are important phenomena during laser-material interaction in laser based direct energy deposition (DED). They have immediate impact on molten pool thermal history and thus affecting the quality of the fabricated part. In this paper, a lumped capacity model was developed to analyze the energy attenuation and partitioning in DED for Inconel (IN) 718 fabrication. Energy absorption and reflection by powders and substrate, energy loss due to radiation and convection as well as latent heat of fusion were quantified based on experimental analysis. High-resolution infrared camera was used to measure the temperature of the molten pool. The energy attenuation by the powders was measured by a power meter. The results suggest that the energy attenuation coefficient of IN 718 in DED is 6.13 % when laser power is 250 W. Also, it is concluded that about 36.3 % of the laser energy is absorbed by the substrate, only a small amount of energy (less than 1 %) is lost due to radiation and convection.
AB - Energy attenuation and partitioning are important phenomena during laser-material interaction in laser based direct energy deposition (DED). They have immediate impact on molten pool thermal history and thus affecting the quality of the fabricated part. In this paper, a lumped capacity model was developed to analyze the energy attenuation and partitioning in DED for Inconel (IN) 718 fabrication. Energy absorption and reflection by powders and substrate, energy loss due to radiation and convection as well as latent heat of fusion were quantified based on experimental analysis. High-resolution infrared camera was used to measure the temperature of the molten pool. The energy attenuation by the powders was measured by a power meter. The results suggest that the energy attenuation coefficient of IN 718 in DED is 6.13 % when laser power is 250 W. Also, it is concluded that about 36.3 % of the laser energy is absorbed by the substrate, only a small amount of energy (less than 1 %) is lost due to radiation and convection.
KW - Direct energy deposition
KW - Energy transmission
KW - Heat transfer
KW - Inconel 718
UR - http://www.scopus.com/inward/record.url?scp=85094910640&partnerID=8YFLogxK
U2 - 10.1016/j.promfg.2020.05.094
DO - 10.1016/j.promfg.2020.05.094
M3 - Conference article
AN - SCOPUS:85094910640
VL - 48
SP - 656
EP - 662
JO - 48th SME North American Manufacturing Research Conference, NAMRC 48
JF - 48th SME North American Manufacturing Research Conference, NAMRC 48
SN - 2351-9789
Y2 - 22 June 2020 through 26 June 2020
ER -