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采用Kim,Kim,Suzuki和Ode提出的KKSO多相场模型,研究了固定层片间距不同层片厚度条件下三维过共晶层片生长形态的演化行为.研究表明,层片厚度对层片生长过程有较大影响.当层片厚度较小时,厚度效应较弱,类似于二维生长.随着层片厚度的增加,厚度效应逐渐增强并开始产生厚度方向的振荡失稳,造成层片取向的偏转.层片厚度的进一步增加,使层片宽度方向和层片厚度方向的振荡交替出现.当层片厚度大于层片宽度时,厚度效应逐渐强于宽度效应,最终宽度方向的振荡被抑制,仅在厚度方向形成类似于二维的1λ振荡.模拟结果还表明,不同层片厚度下液/固界面前沿平均过冷度变化与形态变化的趋势相符.
The KKSO multi-phase field model proposed by Kim, Kim, Suzuki and Ode was used to study the evolution behavior of three-dimensional hypereutectic layer under the condition of different layer thickness. The results show that the layer thickness When the thickness is small, the thickness effect is weak, which is similar to two-dimensional growth.With the increase of the thickness of the layer, the thickness effect gradually increases and begins to oscillate in the thickness direction, resulting in the orientation of the layer The further increase of the thickness of the ply causes the alternation of the width of the ply and the oscillation of the ply in the thickness direction.When the thickness of the ply is greater than the width of the ply, the thickness effect is gradually stronger than that of the width effect, finally the oscillation in the width direction is suppressed , Which is similar to two-dimensional 1λ oscillation only in the thickness direction.The simulation results also show that the variation of the average undercooling at the front of the liquid / solid interface is in agreement with the morphological change at different layer thickness.