Fig. 1. Schematic of laser melt injection in collaboration with electromagnetic compound field

Fig. 2. Morphology of spherical WC particles

Fig. 3. Flow field distribution in molten pool under action of electromagnetic compound field (t=3.9 s). (a) B=0 T;(b) B=0.9 T; (c) B=0.9 T, upward Lorenz force; (d) B=0.9 T, downward Lorenz force

Fig. 4. Influence of induced Lorentz force on surface fluid speed in molten pool (t=3.9 s)

Fig. 5. Influence of directional Lorentz force on surface fluid speed in molten pool (t=3.9 s)

Fig. 6. Temperature field distribution in molten pool under action of electromagnetic compound field (t=3.9 s). (a) B=0 T; (b) B=0.9 T; (c) B=0.9 T, upward Lorenz force; (d) B=0.9 T, downward Lorenz force

Fig. 7. Particle distribution in melt injection layer under action of electromagnetic compound field. (a) B=0 T; (b) B=0.9 T, upward Lorenz force; (c) B=0.9 T, downward Lorenz force

Fig. 8. Experimental results of particle distributions in longitudinal section of melt injection layer under action of electromagnetic compound field. (a) With upward Lorenz force; (b) with downward Lorenz force; (c) without Lorenz force

Fig. 9. WC particle morphologies under action of electromagnetic compound field. (a) Without Lorenz force; (b) with downward Lorenz force; (c) with upward Lorenz force

Fig. 10. Schematic of forces acting on particles and fluid under action of electromagnetic compound field