Numerical simulation of inclusions in K439B turbine nozzle casting
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摘要: 导向器是飞机重要零部件，用高温合金K439B铸造导向器过程中易产生夹杂，导致导向器性能降低。运用ProCAST有限元模拟软件分析浇注温度和浇注速度对夹杂产生的影响。研究发现，当浇注温度升高，导向器铸件的夹杂数量整体呈现减少的趋势，浇注温度为
1520 ℃时夹杂最少；当浇注速度增加，夹杂的直径先增大后减小，夹杂数量有所减少，在浇注速度为176 mm/s时夹杂最少。研究得出最佳工艺参数为浇注温度1520 ℃，浇注速度176 mm/s，此时夹杂缺陷最少。Abstract: The turbine nozzle is an important component of aircraft. During the casting process of the turbine nozzle made of high-temperature alloy K439B, inclusions are prone to be generated, leading to a decrease in its performance. The finite element simulation software ProCAST was used to analyze the influence of pouring temperature and pouring speed on inclusion. The results show that the inclusions in the turbine nozzle castings tend to decrease as pouring temperature increases. With increasing pouring speed, the diameter of inclusions first increases and then decreases, while the number of inclusions decreases. The inclusions were the least when the pouring speed was 176 mm/s. The optimal process parameters were a pouring temperature of1520 ℃ and a pouring speed of 176 mm/s, under which inclusion defects were minimized. The finding can provide a reference for improving the casting process of the turbine nozzle, reducing inclusions and enhancing the performance of the castings.-
Key words:
- K439B alloy /
- turbine nozzle /
- numerical simulation /
- inclusions /
- ProCAST software
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图 2 K439B黏度−温度曲线及固相分数−温度曲线
Figure 2. Viscosity-temperature curve and fraction solid-temperature curve of K439B
图 3 不同浇注温度产生夹杂对比图
Figure 3. Comparison diagram of inclusions produced at different pouring temperatures
图 4 不同浇注温度下夹杂数量和平均直径对比图
Figure 4. Comparison of inclusions number and average diameter at different pouring temperatures
图 5 固相率10%时不同浇注温度的温度场对比图
Figure 5. Comparison of temperature field at different pouring temperatures with 10% solid phase ratio
图 8 不同浇注速度下夹杂数量、平均直径对比图
Figure 8. Comparison of inclusions number and average diameter at different pouring speeds
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