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Numerical and analytical investigation on meltpool temperature of laser-based powder bed fusion of IN718

Khorasani, Mahyar, Ghasemi, AmirHossein, Leary, Martin, O'Neil, William, Gibson, Ian, Cordova, Laura and Rolfe, Bernard 2021, Numerical and analytical investigation on meltpool temperature of laser-based powder bed fusion of IN718, International journal of heat and mass transfer, vol. 177, pp. 1-13, doi: 10.1016/j.ijheatmasstransfer.2021.121477.

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Title Numerical and analytical investigation on meltpool temperature of laser-based powder bed fusion of IN718
Author(s) Khorasani, Mahyar
Ghasemi, AmirHossein
Leary, Martin
O'Neil, William
Gibson, Ian
Cordova, Laura
Rolfe, BernardORCID iD for Rolfe, Bernard orcid.org/0000-0001-8516-6170
Journal name International journal of heat and mass transfer
Volume number 177
Article ID 121477
Start page 1
End page 13
Total pages 13
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2021-10
ISSN 0017-9310
Keyword(s) Laser-based powder bed fusion
Numerical simulation
Analytical model
Meltpool temperature
Keyhole mode
Conduction mode
Summary Prediction of meltpool features in Laser-Based Powder Bed Fusion (LB-PBF) is a complex non-linear multiple phase dynamic problem. In this investigation, numerical simulations and analytical models are offered to predict meltpool temperature and to provide a methodology to estimate melt track quality. By determining the meltpool temperature, different rheological phenomena including recoil pressure can be controlled. Recoil pressure is known to drive the keyhole and conduction modes in LB-PBF which is an important factor to qualify the melt track. A numerical simulation was carried out using Discrete Element Method (DEM) with a range of process parameters and absorptivity ratios; allowing observation of the variation of meltpool temperature and free surface morphology, as calculated by the volume-of-fluid (VOF) method. A spatially thermophysical-based analytical model is developed to estimate meltpool temperature, based on LB-PBF process parameters and thermophysical properties of the material. These results are compared with experimentally observed meltpool depth for IN718 specimens and found to have a good accuracy. The numerical and analytic results show good agreement in the conduction mode to estimate the meltpool temperature and related phenomena such as recoil pressure to control the melt track and layering quality. The analytical model does not accurately predict the keyhole mode which may be explained by evaporation of chemical elements in the examined material.
Language eng
DOI 10.1016/j.ijheatmasstransfer.2021.121477
Indigenous content off
Field of Research 01 Mathematical Sciences
02 Physical Sciences
09 Engineering
HERDC Research category C1 Refereed article in a scholarly journal
Free to Read? Yes
Persistent URL http://hdl.handle.net/10536/DRO/DU:30152851

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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.