Numerical simulation of transient thermal field in laser melting process

2004 ◽  
Vol 25 (8) ◽  
pp. 945-950 ◽  
Author(s):  
Yao Guo-feng ◽  
Chen Guang-nan
Keyword(s):  
Numerical Simulation ◽  
Thermal Field ◽  
Melting Process ◽  
Laser Melting ◽  
Transient Thermal

Thermal Analysis of the Mg-Al Alloys

2006 ◽  
Vol 508 ◽  
pp. 603-608 ◽  
Author(s):  
Jožef Medved ◽  
Primož Mrvar
Keyword(s):  
Numerical Simulation ◽  
Thermal Field ◽  
Crystalline Silicon ◽  
Al Alloys ◽  
Viscoplastic Deformation ◽  
Silicon Ingot ◽  
Cooling Conditions ◽  
Crystallisation Process ◽  
Transient Thermal

Multi-crystalline silicon ingot casting using directional crystallisation is the most costeffective technique for the production of Si for the photovoltaic industry. Non-uniform cooling conditions and a non-planarity of the solidification front result, however, in the build-up of stresses and viscoplastic deformation. Known defects, such as dislocations and residual stresses, can then occur and reduce the quality of the produced material. Numerical simulation, combined with experimental investigation, is therefore a key tool for understanding the crystallisation process, and optimizing it. The purpose of the present work is to present an experimental furnace for directional crystallisation of silicon, and its analysis by means of numerical simulation. The complete casting procedure, i.e., including both the crystallisation phase and the subsequent ingot cooling, is simulated. The thermal field has been computed by a CFD tool, taking into account important phenomena such as radiation and convection in the melt. The transient thermal field is used as input for a thermo-elasto-viscoplastic model for the analysis of stress build-up and viscoplastic deformation during the process. Numerical analysis is employed to identify process phases where further optimisation is needed in order to reduce generated defects.

Thermo-Mechanical Analysis of Directional Crystallisation of Multi-Crystalline Silicon Ingots

2006 ◽  
Vol 508 ◽  
pp. 597-602 ◽  
Author(s):  
Mohammed M'Hamdi ◽  
Ernst A. Meese ◽  
Harald Laux ◽  
Eivind J. Øvrelid
Keyword(s):  
Numerical Simulation ◽  
Thermal Field ◽  
Crystalline Silicon ◽  
Mechanical Analysis ◽  
Viscoplastic Deformation ◽  
Silicon Ingot ◽  
Cooling Conditions ◽  
Crystallisation Process ◽  
Transient Thermal

Multi-crystalline silicon ingot casting using directional crystallisation is the most costeffective technique for the production of Si for the photovoltaic industry. Non-uniform cooling conditions and a non-planarity of the solidification front result, however, in the build-up of stresses and viscoplastic deformation. Known defects, such as dislocations and residual stresses, can then occur and reduce the quality of the produced material. Numerical simulation, combined with experimental investigation, is therefore a key tool for understanding the crystallisation process, and optimizing it. The purpose of the present work is to present an experimental furnace for directional crystallisation of silicon, and its analysis by means of numerical simulation. The complete casting procedure, i.e., including both the crystallisation phase and the subsequent ingot cooling, is simulated. The thermal field has been computed by a CFD tool, taking into account important phenomena such as radiation and convection in the melt. The transient thermal field is used as input for a thermo-elasto-viscoplastic model for the analysis of stress build-up and viscoplastic deformation during the process. Numerical analysis is employed to identify process phases where further optimisation is needed in order to reduce generated defects.

Numerical Simulation of Balling Phenomenon in Metallic Laser Melting Process

2016 ◽  
Author(s):  
Xin Liu ◽  
Mhamed Boutaous ◽  
Shihe Xin ◽  
Dennis Siginer
Keyword(s):  
Numerical Simulation ◽  
Selective Laser Sintering ◽  
Contact Process ◽  
Melting Process ◽  
Complex Model ◽  
Laser Melting ◽  
Powder Bed ◽  
Experimental Works ◽  
3D Numerical Model ◽  
Manufacturing Technologies

As well known, the selective laser Sintering (SLS) is one of the most modern and innovative additive manufacturing technologies with general advantages and wide applications, as a non-contact process, which is flexible, and easily controlled. The choice of process parameters is quite important for laser melting in metallic powder bed. When these parameters are not correctly chosen, particles are either not sintering at all or joining into rather large droplets. This process is named as balling phenomenon, which is extremely unfavorable. In this paper, a 3D numerical model based on discrete element method is proposed in order to study the effect of parameters on the generation of balling droplets in laser melting process. A complex model is developed which couples all phenomena of full SLS process and results of simulations are compared with experimental works of other researchers taken from the literature.

Three-dimensional numerical simulation of selective laser melting process based on SPH method

2021 ◽  
Vol 71 ◽  
pp. 224-236
Author(s):  
Yunji Qiu ◽  
Xiaofeng Niu ◽  
Tingting Song ◽  
Mengqing Shen ◽  
Wenqi Li ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Selective Laser Melting ◽  
Three Dimensional ◽  
Melting Process ◽  
Laser Melting ◽  
Sph Method ◽  
Selective Laser Melting Process
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