Numerical Simulation Study on Solidification Micro structure of Cast Steel Ingot
The solidification microstructures of a cast medium carbon steel ingot were simulated using the CAFE method,and relevant parameters including the nucleation density(n),the nucleation undercooling(ΔT)and the dendrite tip growth kinetics parameters(a2,a3),which suitable for the numerical simulation of the soidification microstructure of sand-casting medium carbon steel ingot,were determined.On this basis,the influnces of different nucleation and growth parameter conditions on the numerical simulation results were compared and analyzed.It was observed that when the surface nucleation undercooling(ΔTs,max)was kept constant,the columnar crystal region expanded as the bulk nucleation undercooling(ΔTb,max)increased;when the nucleation parameter conditions were kept constant,increasing the values of a2 and a3 also led to an expansion of the columnar crystal region;the numerical simulation results of the solidification microstructures of the cast steel ingots under the conditions of different cooling rates showed that the quantities of the columnar crystals increased as the cooling rate was increased.
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