Experiment and Numerical Simulation of Microstructure of ZL114A Alloy in Low Pressure Casting

Li Bin1; Xu Qingyan1; Xiong Yancai2; Zhou Yongjiang2; Hong Runzhou2; Liu Baicheng1

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Experiment and Numerical Simulation of Microstructure of ZL114A Alloy in Low Pressure Casting
Issue 10, Pages: 759-762(2007)
Published： 2007 ，
DOI：

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[1]李斌,许庆彦,熊艳才,周永江,洪润洲,柳百成.低压铸造ZL114A合金微观组织的研究与数值模拟[J].特种铸造及有色合金,2007(10):759-762+734.

Li Bin1, Xu Qingyan1, Xiong Yancai2, et al. Experiment and Numerical Simulation of Microstructure of ZL114A Alloy in Low Pressure Casting. [J]. Special Casting & Nonferrous Alloys (10):759-762(2007)
[1]李斌,许庆彦,熊艳才,周永江,洪润洲,柳百成.低压铸造ZL114A合金微观组织的研究与数值模拟[J].特种铸造及有色合金,2007(10):759-762+734. DOI：

Li Bin1, Xu Qingyan1, Xiong Yancai2, et al. Experiment and Numerical Simulation of Microstructure of ZL114A Alloy in Low Pressure Casting. [J]. Special Casting & Nonferrous Alloys (10):759-762(2007) DOI：

摘要

通过浇注阶梯试样对低压铸造ZL114A合金进行了试验研究

分析了不同冷却速率对合金凝固过程的影响。基于试验数据统计分析

建立了形核模型

并给出了模型相关热力学、动力学参数。结果表明

随着冷速的增加

液相线温度、形核温度和共晶转变温度均降低

初生相以及共晶相的形核、凝固时间缩短。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。对航空启动机叶轮不同部位的微观组织进行了预测并将模拟值与试验值进行了对比验证

试验和模拟值吻合较好。

Abstract

Effects of various cooling rates on solidification of the ZL114A alloy were investigated by experimentally analyzing multi-step ZL114A samples in low pressure casting. A nucleation model was established on the basis of experimental data

in which the thermal-kinetics parameters were provided. The results show that with the increase of cooling rate

all the liquidus temperature

nucleation temperarure and eutectic transformation temperature are decreased. A modified Cellar Automaton model coupled with FDM（finite differential method） was used to simulate the macro-solidification and microstructure evolution of the alloy. The microstructure at different positions of the engine for aerospace was predicted by the model

which was verified by the experimental value.