Study On Fluid Flow And Heat Transfer Behaviors In Molten Pool Of Twin-belt Amorphous Alloy Strip Caster

As a kind of novel metastable materials,Zr-based amorphous alloys are known as“Century Materials”because of its excellent performances.Based on the twin-belt jet cooling caster which was designed to prepare Zr-based amorphous alloys strip,a VOF three-dimensional transient thermal-hydraulic coupling model of molten pool was established by considering interactions between liquid Zr₄₁Ti₁₄Ni₁₀Cu_12.5Be_22.52.5 alloy and air layer.Laws of flow and temperature fields distributions in molten pool were analyzed by the method of numerical simulation.The main research contents of this paper are as follows:?1?The three-dimensional coupling model can predict free surface fluctuating and the distributions of flow and temperature fields during the axial direction in molten pool.The surface fluctuating in side confinement region and the edge area temperature of pool outlet increased obviously when using traditional wedge-shaped feeding system.Therefore this paper developed a new feeding system and verified its rationality form both flow and temperature field.?2?Based on the new feeding system,the influence rules of nozzle angle,immersion depth and feeding system length on flow and temperature fields distributions were studied,the result can provide guidance for feeding system parameters design in twin-belt casting.?3?With the maximum surface fluctuation and the temperature difference of pool's outlet as evaluation indexes,by using orthogonal test,the paper selected the optimal combination of feeding system parameters as follow:feeding system length is 130mm,nozzle angle is 30°and immersion depth is 25mm.Meanwhile,the sequence of feeding system parameters of effecting the evaluation indexes is immersion depth,nozzle angle and feeding system length.