Evaluation of thermal behavior during laser metal deposition using optical pyrometry and numerical simulation

2017 ◽  
Author(s):  
Alexander V. Dubrov ◽  
Yuri N. Zavalov ◽  
Fikret K. Mirzade ◽  
Vladimir D. Dubrov
Keyword(s):  
Numerical Simulation ◽  
Thermal Behavior ◽  
Metal Deposition ◽  
Laser Metal Deposition ◽  
Optical Pyrometry

Numerical Simulation of the Thermal Behavior during Laser Metal Deposition Shaping Technology

2013 ◽  
Vol 380-384 ◽  
pp. 4327-4331
Author(s):  
Kai Zhang ◽  
Lei Wang ◽  
Xin Min Zhang
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Thermal Behavior ◽  
Fem Simulation ◽  
Thermal Response ◽  
Metal Deposition ◽  
Process Time ◽  
Laser Metal Deposition ◽  
And Control ◽  
Good Agreement

Laser Metal Deposition Shaping (LMDS) is an emerging manufacturing technique that ensures significant reduction of process time between initial design and final components. The fabrication of fully dense parts with appropriate properties using the LMDS process requires an in-depth understanding of the entire thermal behavior of the process. In this paper, the thermal behavior during LMDS was studied, both numerically and experimentally. Temperature distribution and gradient in the fabricated part were obtained by finite element method (FEM) simulation. The numerical results are in good agreement with the experimental observations. The numerical method contributes to the comprehension and control of the thermal behavior, and may be used to optimize process parameters and predict the thermal response of LMDS fabricated components.

scholarly journals A coupled multiphase Lagrangian-Eulerian fluid-dynamics framework for numerical simulation of Laser Metal Deposition process

2021 ◽  
Author(s):  
Mauro Murer ◽  
Giovanni Formica ◽  
Franco Milicchio ◽  
Simone Morganti ◽  
Ferdinando Auricchio
Keyword(s):  
Fluid Dynamics ◽  
Numerical Simulation ◽  
3D Printing ◽  
Deposition Process ◽  
Metal Deposition ◽  
Particle Model ◽  
Laser Metal Deposition ◽  
Metal Powders ◽  
Carrier Gas ◽  
Computational Fluid Dynamics Cfd

Abstract We present a Computational Fluid Dynamics (CFD) framework for the numerical simulation of the Laser Metal Deposition (LMD) process in 3D printing. Such a framework, comprehensive of both numerical formulations and solvers, aims at providing an exhaustive scenario of the process, where the carrier gas, modeled as an Eulerian incompressible fluid, transports metal powders, tracked as Langrangian discrete particles, within the 3D printing chamber. On the basis of heat sources coming from the laser beam and the heated substrate, the particle model is developed to interact with the carrier gas also by heat transfer and to evolve in a melted phase according to a growth law of the particle liquid mass fraction. Enhanced numerical solvers, characterized by a modified Netwon-Raphson scheme and a parallel algorithm for tracking particles, are employed to obtain both e ffi ciency and accuracy of the numerical strategy. In the perspective of investigating optimal design of the whole LMD process, we propose a sensitivity analysis specifically addressed to assess the influence of inflow rates, laser beams intensity, and nozzle channel geometry. Such a numerical campaign is performed with an in-house C++ code developed with the deal.II open source Finite Element library.

Numerical Simulation of Gas-Solid Two-Phase Flow Field on Coaxial Powder Feeding in Laser Metal Deposition

Applied laser ◽  
2012 ◽  
Vol 32 (6) ◽  
pp. 510-515
Author(s):  
钦兰云 Qin Lanyun ◽  
王维 Wang Wei ◽  
杨光 Yang Guang ◽  
卞宏友 Bian Hongyou ◽  
佟明 Tong Ming ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Two Phase Flow ◽  
Metal Deposition ◽  
Phase Flow ◽  
Laser Metal Deposition ◽  
Two Phase ◽  
Powder Feeding

Numerical Simulation of Temperature Field of Direct Laser Metal Deposition Shaping Process of Titanium Alloys

2011 ◽  
Vol 295-297 ◽  
pp. 2112-2119
Author(s):  
Yuan Kong ◽  
Wei Jun Liu ◽  
Yue Chao Wang
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Thermal Stress ◽  
Stress Field ◽  
Molten Pool ◽  
Three Dimensional ◽  
Metal Deposition ◽  
Laser Metal Deposition ◽  
Forming Process ◽  
Direct Laser

In order to control the thermal stress of forming process, based on “element birth and death” technology of finite element method, a numerical simulation of three-dimensional temperature field and stress field during multi-track & multi-layer laser metal deposition shaping(LMDS) process is developed with ANSYS parametric design language (APDL). The dynamic variances of temperature field and stress field of forming process are calculated with the energy compensation of interaction between molten pool-powder and laser-powder. The temperature field, temperature gradient, thermal stress field and distribution of residual stress are obtained. The results indicate that although the nodes on different layers are activated at different time, their temperature variations are similar. The temperature gradients of samples are larger near the molten pool area and mainly along z-direction. Finally, it’s verified that the analysis results are consistent with actual situation by the experiments with same process parameters.

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