Effects of manufacturing parameters in planar flow casting process on ribbon formation and puddle evolution of Fe-Si-B alloy

The effects of manufacturing parameters in the planar flow casting process on the ribbon formation and the puddle stability of Fe₇₈Si₉B₁₃ alloy are investigated experimentally. The ribbon morphology, surface quality, and puddle geometry are examined at different conditions and the transient evolution processes of puddle for molten metal passing through a rectangular nozzle are observed. The successful operability window for the production of Fe₇₈Si₉B₁₃ ribbon is established and it is found the scope is different from that of Al-based alloy. The trend lines of the alloys on the plane of Reynolds number versus Weber number corresponding to obtain a successful ribbon are established. The ribbon thickness is found to vary with the applied pressure across the crucible and the wheel speed to the power of 0.45 and - 0.9, respectively. The formation of small air pockets could be enhanced by increasing the applied pressure difference and wheel speed, or by decreasing the nozzle-wheel gap and the jetting temperature.