Simulation of Primary Dendrite Competitive Growth and Solute Concentration Distribution in Directional Solidification DZ125 Superalloy

Kang Maodong; Li Shuangming; Liu Lin; Fu Hengzhi

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Simulation of Primary Dendrite Competitive Growth and Solute Concentration Distribution in Directional Solidification DZ125 Superalloy
Vol. 29, Issue 6, Pages: 512-515(2009)
Published： 2009 ，
DOI：

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[1]康茂东,李双明,刘林,傅恒志.DZ125高温合金定向凝固中的枝晶竞争生长及溶质分布模拟[J].特种铸造及有色合金,2009,29(06):512-515+484-485.

Kang Maodong, Li Shuangming, Liu Lin, et al. Simulation of Primary Dendrite Competitive Growth and Solute Concentration Distribution in Directional Solidification DZ125 Superalloy. [J]. Special Casting & Nonferrous Alloys 29(6):512-515(2009)
[1]康茂东,李双明,刘林,傅恒志.DZ125高温合金定向凝固中的枝晶竞争生长及溶质分布模拟[J].特种铸造及有色合金,2009,29(06):512-515+484-485. DOI：

Kang Maodong, Li Shuangming, Liu Lin, et al. Simulation of Primary Dendrite Competitive Growth and Solute Concentration Distribution in Directional Solidification DZ125 Superalloy. [J]. Special Casting & Nonferrous Alloys 29(6):512-515(2009) DOI：

摘要

采用元胞自动机法与有限差分（CA-FD）耦合计算

模拟了恒温度梯度定向凝固下DZ125高温合金枝晶竞争生长过程以及溶质分布。结果表明

模型能够动态演示DZ125高温合金微观组织演化的细节。在抽拉速度为10μm/s时

糊状区枝晶干中心从枝晶底部到尖端存在1%/mm的溶质梯度

其界面前沿液相溶质浓度从44.16%衰减为合金原始溶质浓度38.68%;而在抽拉速度为100μm/s时

糊状区枝晶干中心从枝晶底部到尖端溶质梯度很小

其界面处的液相溶质浓度为51.54%

比10μm/s时的值大。在抽拉速度为100μm/s时定向凝固枝晶间液相溶质浓度从底部到顶部逐渐减小

减小的幅度为20%/mm

其值与理论计算结果基本符合。

Abstract

Primary dendritic competitive growth and solute concentration distribution in directional solidification DZ125 superalloy were simulated by cellular automaton coupled with finite differential method（CA-FD）in case of a fixed temperature gradient.The results indicate that the modeling can visualize the microstructural evolution of DZ125 superalloy.A solute concentration gradient of 1%/mm from the bottom to the tip in solidified dendrite exists in mushy zone at the growth rate of 10 μm/s

meanwhile

the liquid solute concentration is decreased from 44.16% at the interface to 38.68% out of the solute diffusion layer.At the growth rate of 100 μm/s

the solute concentration gradient in solidified dendrites becomes smaller

compared with that of ones at 10 μm/s

and its interface liquid concentration makes 51.54%

which is the higher than that of 10 μm/s.The liquid concentration in the dendrites is decreased from the bottom to the top as 20%/mm in mushy zone at 100μm/s

which is well in agreement with that from theoretical analysis’s.