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采用熔体流动的相场模型,模拟了Fe-C合金等温凝固中的枝晶生长过程,研究了流动方向对枝晶生长行为的影响。结果表明:在流动方向与晶粒优先生长方向平行时,晶粒第一、二象限的主枝和侧枝粗大,第三、四象限的主枝和侧枝细小。随着流动方向与枝晶优先生长[100]方向夹角θ0的增加,晶粒第一、四象限的侧枝数量增加且生长迅速,第二、三象限的侧枝退化;同时,[100]方向枝晶臂长度减小,溶质浓度降低,[-100]方向枝晶臂长度增加,溶质浓度先减小后增加。
The phase field model of melt flow was used to simulate the dendrite growth during isothermal solidification of Fe-C alloy and the effect of flow direction on the dendrite growth behavior was studied. The results show that the main and side branches of the first and second quadrants are coarse and the main and side branches of the third and fourth quadrants are fine when the flow direction is parallel to the preferential growth direction of the grains. With the increase of the angle θ0 between the direction of flow and the preferential growth of dendrites [100], the number of collaterals in the first and the fourth quadrant increased and grew rapidly, while the collateral in the second and third quadrants degenerated. Meanwhile, [100] The length of the arm decreases and the concentration of solute decreases. The length of the dendrite arm increases in [- 100] direction, and the solute concentration first decreases and then increases.