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| Abstract: |
| The bubble migration in liquid titanium alloy melt during vertical centrifugal casting process has been predicted. The effects of different parameters, such as the initial bubble location, the mold rotational speed and the mold rotational direction on the bubble in the migration process are investigated. The results show that the bubble migration can be divided into the radial movement to the mould rotation axis and the circular movement to the mould wall opposite to rotational direction of the casting mould. The casting mould wall has an impeditive effect on the circular movement of the bubble during its migration process. And the bubble finally migrates like a straight line along the mould wall located at the opposite direction of the rotational casting mould whether it rotates clockwise or anti-clockwise. The bubbles at the position near the mould wall located at the opposite direction of the rotational casting mould are much easier to migrate in a straight line. The instantaneous speed of the gas bubble increases with the increment of the mould rotational speed. However the mould rotational speed is high or low, the moving speed of the gas bubble increases slightly at the primary stage, and then decreases gradually like a ladder. |
| Key words: titanium alloy vertical centrifugal casting gas bubble migration numerical simulation |
| DOI：10.11916/j.issn.1005-9113.17148 |
| Clc Number:TN957.51 |
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| Descriptions in Chinese: |
| 立式离心铸造钛合金熔体中气泡运动的数值模拟 徐琴1，王星1，吴士平2 （1. 河南工业大学 机电工程学院，郑州450001； 2. 哈尔滨工业大学 材料科学与工程学院，哈尔滨 150001） 创新点说明：针对圆筒形薄壁复杂钛合金铸件的离心铸造问题，采用简化的型腔模型对气泡在钛合金熔体中运动规律进行了研究，分析气泡初始位置、铸型转速和旋转方向等对气泡迁移的影响，对预测钛合金铸件中气孔缺陷和深入认识离心铸造中的两相流动有一定意义。 关键词：钛合金；立式离心铸造；气泡；运动；数值模拟 |
