利用KKSO多相场模型,对亚共晶模型合金的层-棒转变过程进行模拟.结果表明,共晶形态的层-棒转变不是突变而是在一定成分范围内渐变的.在各向同性界面能条件下,当次要相体积分数远小于1/π时,共晶形态将发生层-棒转变,该相以棒状形式存在;当次要相体积分数在1/π附近时,层片共晶不完全向棒状共晶转变,且随着次要相体积分数的增大,转变时刻推迟;当次要相的体积分数远大于1/π时,层片状共晶不再向棒状共晶转变.共晶形态的层-棒转变趋势与初始层片间距有关,模拟结果与实验结果定性一致. The KKSO multi-phase field model was used to simulate the layer-rod transition of the hypoeutectic model alloy. The results show that the layer-rod transition of the eutectic phase is not abrupt but graded within a certain composition. In the isotropic interface When the minor phase volume fraction is far less than 1 / π, the eutectic morphology will undergo layer-to-rod transformation, which exists in the form of rods. When the minor phase volume fraction is around 1 / π, When the volume fraction of the minor phase is much larger than 1 / π, the lamellar eutectic no longer changes to the rod-shaped eutectic Transition.The eutectic morphology of the layer - the trend of the rod changes with the initial layer spacing, the simulation results qualitatively consistent with the experimental results.