Thermal and Melting track Simulations of Laser Powder Bed Fusion (L-PBF)

Laser powder bed fusion (L-PBF) process involves with the construction of phase transformation, melting, and rapid solidification of weld metal powder bed which affects the properties and the microstructure of final parts, e.g. density, dimension, mechanical properties, void, porosity, and non-fully...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2019-06, Vol.526 (1), p.12030
Main Authors: Ninpetch, P, Kowitwarangkul, P, Mahathanabodee, S, Tongsri, R, Ratanadecho, P
Format: Article
Language:English
Subjects:
Diameters
Heat distribution
Laser beam melting
Laser beam welding
Lasers
Mechanical properties
Melt pools
Metal powders
Phase transitions
Powder beds
Process parameters
Rapid prototyping
Rapid solidification
Scanning
Temperature distribution
Thickness
Three dimensional flow
Weld metal
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Summary:Laser powder bed fusion (L-PBF) process involves with the construction of phase transformation, melting, and rapid solidification of weld metal powder bed which affects the properties and the microstructure of final parts, e.g. density, dimension, mechanical properties, void, porosity, and non-fully melted particle. The aims of this work were to study the effect of process parameters, e.g. laser power and scanning speed, on the temperature field and melt pool geometry and the characteristics of single melting track in the L-PBF process by using the commercial CFD software simulation Flow-3D (Flow-weld). The laser power, scanning speed, laser spot diameter, and layer thickness varied in this study were 120 W, 140 W, 0.4 m/s, 0.6 m/s, 0.8 m/s, 80 μm and 50 μm respectively. The results stated that at the lower scanning speed, the temperature field has a region of heat distribution larger than that of the higher one. The geometry of melt pools can be changed from ellipse shape to tear drop shape when the scanning speed is increased. The width and depth of laser melting track is increased when the higher laser power and lower scanning speed are applied. The void is found underneath the laser melting track when the scanning speed changes from 0.4 m/s to 0.6 m/s.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/526/1/012030