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在所建立的数学模型基础上总结了 Ti Al基合金熔体离心力场下的充型规律。结果表明 ,离心力场的施加对于充型过程有重要影响 ,熔体以变化的截面面积和倾角填充铸型。熔体截面面积随充型长度的增大而减小 ,而熔体截面倾角随充型长度的增大而增大 ,这种变化在型腔入口附近表现得更加明显。此外 ,针对金属型离心浇铸 Ti- 48Al- 2 Cr- 2 Nb ( at% )合金汽车排气阀内部的常见缺陷 ,探讨了离心力场下排气阀内部卷入性气孔和偏中心线缩松的产生机理。
On the basis of the established mathematical model, the charge-and-fill rules of TiAl-based alloy melt in centrifugal field were summarized. The results show that the application of centrifugal force field has an important influence on the filling process. The melt fills the mold with varying cross-sectional area and inclination angle. The cross-sectional area of the melt decreases with the increase of the filling length, while the inclination of the melt cross-section increases with the length of the filling. This change is more obvious near the entrance of the cavity. In addition, aiming at the common defects in the interior of Ti-48Al-2 Cr-2Nb (at%) alloy automotive exhaust valve with metal centrifugal casting, the influence of the shrinkage Generate mechanism.