Laser Direct Metal Deposition, alloying and similar additive processes are recognised as difficult to model because of the complicated mass and heat flow. This paper compares analytical and finite element approaches via a case study of the coaxial laser direct metal deposition of Inconel 718. The analytical models used are based on superposition of the quasi-stationary temperature fields of multiple moving heat sources, modified to account for the incoming mass. The finite element models used are based on element birth methods and utilize the anisotropic enhanced thermal conductivity method. The simulations are compared with experimentally results and results show that both methods can predict depth more accurately than width. The analytical method generally underestimates width and the finite element method overestimates it. The model inaccuracies can be explained in part by considering the increased effective conductivity within the melt pool.
REFERENCES
1.
Han
, L.
, Liou
, F.W.
& Phatak
, K.M.
(2004
) Modeling of laser cladding with powder injection
, Metallurgical and Materials Transactions B-Process Metallurgy and Materials Processing Science
35
(6
), 1139
–1150
.2.
Han
, L.
, Phatak
, K.M.
& Liou
, F.W.
(2005
) Modeling of laser deposition and repair process
, Journal of Laser Applications
17
(2
), 89
–99
.3.
Qi
, H.
, Mazumder
, J.
& Ki
, H.
(2006
) Numerical simulation of heat transfer and fluid flow in coaxial laser cladding process for direct metal deposition
, Journal of Applied Physics
100
(2
), 024903
.4.
Alimardani
, M.
& Toyserkani
, E.
(2006
) On the 3D modelling of geometrical formation in laser solid freeform fabication process, in
25th International Conference on Applications of Lasers and Electro-Optics (ICALEO
), Scottsdale CA USA, CD
.5.
Alimardani
, M.
, Toyserkani
, E.
& Huissoon
, J.P.
(2007
) Three-dimensional numerical approach for geometrical prediction of multilayer laser solid freeform fabrication process
, Journal of Laser Applications
19
(1
), 14
–25
.6.
Pirch
, N.
, Mokadem
, S.
, Keutgen
, S.
& Wissenbach
, K.
(2004
) 3D Model for laser cladding by powder injection, in Laser Assisted Net Shape Engineering (LANE)
, Erlangen, Germany
, 177
–193
.7.
Costa
, L.
, Vilar
, R.
, Reti
, T.
& Deus
, A.M.
(2005
) Rapid tooling by laser powder deposition: Process simulation using finite element analysis
, Acta Materialia
53
(14
), 3987
–3999
.8.
Liu
, J.
& Li
, L.
(2007
) Effects of process variables on laser direct formation of thin wall
, Optics & Laser Technology
39
(2
), 231
–236
.9.
Fathi
, A.
, Toyserkani
, E.
, Khajepour
, A.
& Durali
, M.
(2006
) Prediction of melt pool depth and dilution in laser powder deposition
, Journal of Physics D: Applied Physics
39
(12
), 2613
–2623
.10.
Pinkerton
, A.J.
, Moat
, R.
, Shah
, K.
, Li
, L.
, Preuss
, M.
et al (2007
) A verified model of laser direct metal deposition using an analytical enthalpy balance method
, in 26th International Congress on Applications of Lasers and Electro-optics (ICALEO
), Orlando CA USA, CD
.11.
Pinkerton
, A.J.
(2007
) An analytical model of beam attenuation and powder heating during coaxial laser direct metal deposition
, Journal of Physics D: Applied Physics
40
, 7323
–7334
.12.
Pinkerton
, A.J.
& Li
, L.
(2005
) An experimental and numerical study of the influence of diode beam shape on thin wall direct metal deposition
, Journal of Laser Applications
17
(1
), 47
–56
.13.
Cline
, H.E.
& Anthony
, T.R.
(1977
) Heat treating and melting material with a scanning laser or electron beam
, Journal of Applied Physics
48
(9
), 3895
–3900
.14.
Safdar
, S.
, Li
, L.
, Sheikh
, M.A.
& Schmidt
, M.J.
(2006
) Thermal history analysis of surface heating of mild steel with different laser beam geometries
, Proceedings of the Institution of Mechanical Engineers Part C-Journal of Mechanical Engineering Science
220
(10
), 1549
–1557
.15.
Reddy
, J.N.
& Gartling
, D.K.
(2000
) The Finite Element Method in Heat Transfer and Fluid Dynamics
, CRC Press Inc
.16.
Safdar
, S.
, Pinkerton
, A.J.
, Moat
, R.
, Li
, L.
, Sheikh
, M.A.
et al (2007
) An Anisotropic Enhanced Thermal Conductivity Approach for Modelling Laser Melt Pools, in 26th International Congress on Applications of Lasers and Electro-optics (ICALEO
), Orlando CA USA, CD
.17.
De Deus
, M.A.
(2004
) A Thermal and Mechanical Model of Laser Cladding
, PhD Thesis, Urbana-Champaign Graduate College, University of Illinois
,18.
ANSYS User’s Manual (
1998
), ANSYS Inc.19.
Pottlacher
, G.
, Hosaeus
, H.
, Kaschnitz
, E.
& Seifter
, A.
(2002
) Thermophysical properties of solid and liquid Inconel 718 Alloy
, Scandinavian Journal of Metallurgy
31
, 161
–168
.20.
Kurz
, W.
& Fisher
, D.J.
(1990
) Fundamentals of Solidification
, Trans Tech Publications Limited
.21.
Hofmeister
, W.
, Griffith
, M.
, Ensz
, M.
& Smugeresky
, J.
(2001
) Solidification in direct metal deposition by LENS processing
, JOM
53
(9
), 30
–34
.
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