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建立了用于模拟单相合金固溶体凝固过程温度场、流场、浓度场,以及微观组织模拟的二维元胞自动机-格子玻尔兹曼方法(cellular automaton-lattice Boltzmann method,CA-LBM)数值模型。对强制对流作用下不同工艺条件对枝晶非对称性生长(Dendritic asymmetrical growth,DAG)行为的影响进行了研究。模拟结果表明,与不计入流动过程的纯扩散型合金凝固模拟结果相比较,强制对流造成枝晶非对称性生长行为,且枝晶的凝固效率增加;当工艺条件改变时,枝晶非对称性生长行为也会随之发生变化,表现为初始过冷度越小、对流速度越大、冷却速率越小会使枝晶非对称性生长行为趋向更强。
A two-dimensional cellular automaton-lattice Boltzmann method (CA-LBM) was developed to simulate the temperature field, flow field, concentration field, and microstructure simulation of single-phase alloy solid solution during solidification. Numerical model. The effects of different technological conditions on the behavior of dendritic asymmetrical growth (DAG) under forced convection were studied. The simulation results show that, compared with the pure solidification simulation results of pure diffusion alloy, the forced convection results in asymmetric growth of dendrites and the dendrite solidification efficiency increases. When the process conditions are changed, the dendrite asymmetry Sexual growth behavior will also change, the performance of the initial lower the degree of supercooling, the convection speed is greater, the cooling rate will make the dendrite asymmetric growth trend more strongly.