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

International Conference on Materials Research and Innovation

Ninpetch, P.^1 ; Kowitwarangkul, P.^1 ; Mahathanabodee, S.^2 ; Tongsri, R.^3 ; Ratanadecho, P.^4

Sirindhorn International Thai-German Graduate School of Engineering (TGGS), King Mongkut's University of Technology North Bangkok (KMUTNB), Bangkok

10800, Thailand^1

Department Production Engineering, Faculty of Engineering, King Mongkut's University of Technology North Bangkok (KMUTNB), Bangkok

10800, Thailand^2

Particulate Materials Processing Technology Laboratory (PMPT), National Metal and Materials Technology Center, Pathum Thani

12120, Thailand^3

Department of Mechanical Engineering, Faculty of Engineering, Thammasat University (Rangsit Campus), Pathum Thani

12120, Thailand^4

关键词: CFD softwares;    Fully melted particles;    Heat distribution;    Laser melting;    Laser powders;    Layer thickness;    Process parameters;    Scanning speed;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/526/1/012030/pdf
DOI  :  10.1088/1757-899X/526/1/012030

来源: IOP

【 摘 要 】

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.