在大量实验数据统计分析的基础上，建立了低压铸造ZL114A合金形核模型，得到了相关热力学、动力学参数。采用了一种改进的Celluar Automaton方法耦合有限差分法对合金的宏观凝固及微观组织演化过程进行了数值模拟。考虑了固/液界面的溶质再分布、微观固相分数、曲率以及各向异性因素。利用阶梯铸件研究了不同冷却速度下晶粒度、二次枝晶臂间距以及共晶组织含量的变化规律，并将模拟值与实验值进行了对比验证。
A nucleation model based on the statistical analysis of a number of experimental data was developed and the related thermodynamics and kinetics parameters were presented for low pressure die casting of ZL114A alloy. A modified CA-FD method was proposed to simulate macro solidification process and microstructure evolution of the alloy. The preferential growth orientation, the solute redistribution in both liquid and solid, the solid/liquid interface curvature and the growth anisotropy were all considered in the model. The grain size, secondary dendrite arm spacing and eutectic content volume fraction of the alloy at different cooling rate were predicted and compared with experimental results of step-shaped sample casting.
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] | |
| [8] | |
| [9] | |
| [10] | |
| [11] | |
| [12] | |
| [13] | |
| [14] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%