CO2 laser heating of surfaces: Melt pool formation at surface

2012 ◽  
Vol 44 (2) ◽  
pp. 463-470 ◽  
Author(s):  
O. Momin ◽  
S.Z. Shuja ◽  
B.S. Yilbas
Keyword(s):  
Co2 Laser ◽  
Laser Heating ◽  
Melt Pool ◽  
Pool Formation

scholarly journals The effects of locations on the build tray on the quality of specimens in powder bed additive manufacturing

2021 ◽  
Author(s):  
Snehashis Pal ◽  
Nenad Gubeljak ◽  
Tonica Bončina ◽  
Radovan Hudák ◽  
Teodor Toth ◽  
...  
Keyword(s):  
Main Role ◽  
Particle Sizes ◽  
Additional Experiment ◽  
Powder Bed ◽  
Melt Pool ◽  
Start Line ◽  
Sample Density ◽  
Powder Layering ◽  
Pool Formation

AbstractIn this study, the effect of powder spreading direction was investigated on selectively laser-melted specimens. The results showed that the metallurgical properties of the specimens varied during fabrication with respect to their position on the build tray. The density, porosity, and tensile properties of the Co–Cr–W–Mo alloy were investigated on cuboid and tensile specimens fabricated at different locations. Two different significant positions on the tray were selected along the powder spreading direction. One set of specimens was located near the start line of powder spreading, and the other set was located near the end of the building tray. The main role in the consequences of powder layering was played by the distribution of powder particle sizes and the packing density of the layers. As a result, laser penetration, melt pool formation, and fusion characteristics varied. To confirm the occurrence of variations in sample density, an additional experiment was performed with a Ti–6Al–4V alloy. Furthermore, the powders were collected at two different fabricating locations and their size distribution for both materials was investigated.

Laser Heating and Flow Field Developed in the Melt Pool

2011 ◽  
Vol 59 (12) ◽  
pp. 970-987 ◽  
Author(s):  
S. Z. Shuja ◽  
B. S. Yilbas
Keyword(s):  
Flow Field ◽  
Laser Heating ◽  
Melt Pool

Modeling of Material Removal in Atomized Dielectric-Based Electrical Discharge Machining (EDM)

2019 ◽  
Author(s):  
Asif Tanveer ◽  
Shiv G. Kapoor ◽  
Soham S. Mujumdar
Keyword(s):  
Electrical Discharge ◽  
Material Removal ◽  
Film Flow ◽  
Electrical Discharge Machining ◽  
Dielectric Film ◽  
Machining Process ◽  
Spray Parameters ◽  
Melt Pool ◽  
Material Removal Model ◽  
Pool Formation

Abstract Atomized dielectric-based electrical discharge machining (EDM) is an emerging technology in which the dielectric between the electrodes is supplied in the form of a thin film using a spray atomizer. This novel machining process uses significantly less quantities of dielectric compared to the conventional EDM while resulting in higher material removal rates and better debris flushing. This paper presents a model-based investigation of the atomized dielectric-based EDM to study the effect of the dielectric film flow on material removal. A melt-pool formation and material removal model is developed to predict the material removal in terms of crater shapes during a single EDM discharge. The atomization spray parameters are varied in order to produce different dielectric film velocities. The model accurately captures the asymmetry in crater shapes caused by the dielectric film flow and predicts the crater diameter and depth, however, the model overestimates the crater sizes observed in experiments.

Single-crystal Brillouin spectroscopy with CO2 laser heating and variable q

2015 ◽  
Vol 86 (6) ◽  
pp. 063905 ◽  
Author(s):  
Jin S. Zhang ◽  
Jay D. Bass ◽  
Gaohua Zhu
Keyword(s):  
Single Crystal ◽  
Co2 Laser ◽  
Laser Heating ◽  
Brillouin Spectroscopy
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