Heat Transfer and Flow Mechanisms in Mesoscale Molten Pool of Pure Zinc Fabricated via Laser Powder Bed Fusion (Invited)

Changjun Han; Daolin Yuan; Zhi Dong; Jinmiao Huang; Chaochao Wu; Jiazhu Wu; Yongqiang Yang; Di Wang

doi:10.3788/CJL240627

Chinese Journal of Lasers, Volume. 51, Issue 20, 2002301(2024)

Heat Transfer and Flow Mechanisms in Mesoscale Molten Pool of Pure Zinc Fabricated via Laser Powder Bed Fusion (Invited)

Changjun Han¹, Daolin Yuan¹, Zhi Dong¹, Jinmiao Huang¹, Chaochao Wu², Jiazhu Wu³, Yongqiang Yang¹, and Di Wang^1、*

Author Affiliations

¹School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, Guangdong , China

²School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350108, Fujian , China

³School of Mechanical Engineering, Guizhou University, Guiyang 550025, Guizhou , China

show less

Abstract Get PDF(in Chinese)

Figures & Tables(13)

Fig. 1. Powder bed model. (a) Hertz‒Mindlin contact model^[18]; (b) LPBF laying powder model^[19]

Download full size

Fig. 2. Schematic diagram of the LPBF geometric model

Download full size

Fig. 3. Simulated and experimental track widths under different process parameters

Download full size

Fig. 4. Temperature field and morphology of molten pool at different laser powers (laser scanning rate of 600 mm·s^-1). (a) Top view of molten track; (b) side section of the powder bed

Download full size

Fig. 5. Temperature field and morphology of molten pool at different laser scanning rates (laser power of 60 W). (a) Top view of molten track; (b) side section of the powder bed

Download full size

Fig. 6. Thermal evolution of monitoring point at different laser powers. (a) Temperature evolution curves; (b) cooling rate curves

Download full size

Fig. 7. Thermal evolution of measuring point at different laser scanning rates (laser power of 60 W). (a) Temperature evolution curves; (b) cooling rate curves

Download full size

Fig. 8. Heat accumulation effect in LPBF process of pure Zn (laser power of 60 W, laser scanning rate of 600 mm·s^-1)

Download full size

Fig. 9. Real-time volume of molten pool at different parameters. (a) At different laser powers (scanning rate of 600 mm·s^-1);

Download full size

Fig. 10. Molten pool evolution of pure Zn LPBF process

Download full size

Fig. 11. Molten pool flow and molten pool morphology under different driving forces. (a) Dominated by Marangoni convection;

Download full size

Table 1. Property parameters of pure zinc^[33-35]

View table

Table 1. Property parameters of pure zinc^[33-35]

Symbol	Property	Value
$ν$	Poisson’s ratio	0.27
E	Young’s modulus /GPa	108
$e$	Coefficient of restitution	0.9
$μ_{s}$	Coefficient of static friction	0.62
$μ_{r}$	Coefficient of rolling friction	0.01
$T_{s}$	Melting point /K	692
$T_{e v a p}$	Boiling point /K	1180
$C_{P S}$	Specific heat of solidus /（J·K^-1·kg^-1）	335+0.2T 479
$C_{P L}$	Specific heat of liquidus /（J·K^-1·kg^-1）	335+0.2T 479
$k_{S}$	Thermal conductivity of solidus /（W·m^-1·K^-1）	137.27‒0.0534T 8.42+0.06T
$k_{L}$	Thermal conductivity of liquidus /（W·m^-1·K^-1）	137.27‒0.0534T 8.42+0.06T
$ρ_{S}$	Solidus density /（kg·m^-3）	7140 7434‒0.979T
$ρ_{L}$	Liquidus density /（kg·m^-3）	7140 7434‒0.979T
$L_{m}$	Latent heat of melting /（J·kg^-1）	112000
$μ$	Viscosity of liquid metal /（Pa·s）	0.004
$σ$	Surface tension /（N·m^-1）	0.94‒0.0002T
$η$	Laser beam absorptivity	0.34

Table 2. Process parameter setting in simulation and experiment
View table
Table 2. Process parameter setting in simulation and experiment
Sample No. Laser power /W
Laser scanning rate /
（mm·s^-1）
1， 2， 3， 4， 5 30， 45， 60， 75， 90 600
6， 7， 8， 9 60 300， 450， 750， 900

Tools

Get Citation

Copy Citation Text

Changjun Han, Daolin Yuan, Zhi Dong, Jinmiao Huang, Chaochao Wu, Jiazhu Wu, Yongqiang Yang, Di Wang. Heat Transfer and Flow Mechanisms in Mesoscale Molten Pool of Pure Zinc Fabricated via Laser Powder Bed Fusion (Invited)[J]. Chinese Journal of Lasers, 2024, 51(20): 2002301

Download Citation

EndNote(RIS)BibTex Plain Text

Set citation alerts for article

Save article for my favorites