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首页> 外文期刊>Metallurgical and Materials Transactions A >Grain Selection in Spiral Selectors During Investment Casting of Single-Crystal Turbine Blades: Part I. Experimental Investigation
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Grain Selection in Spiral Selectors During Investment Casting of Single-Crystal Turbine Blades: Part I. Experimental Investigation

机译：单晶涡轮叶片精铸时螺旋选择器中的晶粒选择：第一部分。实验研究

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摘要

Spiral grain selectors are used to grow single-crystal (SX) turbine blades during investment casting. Competitive growth in the spiral selectors leads to the selection of a single grain that subsequently grows to form the blade. In this study, the effect of spiral design on grain selection during investment casting was investigated through a series of experiments. It is found that the spiral design can effectively reduce the grain number but is not able to optimize axial grain orientations during solidification, the effectiveness of grain selection is strongly dependent on the spiral “take-off” angle, and spirals with smaller take-off angles are most potent. It is proposed that grain selection in the spiral is controlled by the geometry of the spiral via a “geometrical blocking” mechanism.
机译：螺旋晶粒选择器用于在熔模铸造过程中生长单晶（SX）涡轮叶片。螺旋选择器的竞争性增长导致对单个晶粒的选择，随后晶粒逐渐长大以形成叶片。在这项研究中，通过一系列实验研究了螺旋设计对精铸过程中晶粒选择的影响。发现螺旋设计可以有效地减少晶粒数量，但不能在凝固过程中优化轴向晶粒取向，晶粒选择的有效性强烈取决于螺旋“起飞”角，而螺旋具有较小的起飞角度最有效。建议通过“几何阻挡”机制通过螺旋的几何形状控制螺旋中的晶粒选择。

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