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首页> 外文会议>International Conference on Solidification and Gravity; 20040906-09; Miskolc-Lillafured(HU) >Modeling of Unidirectional Growth in a Single Crystal Turbine Blade Casting
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Modeling of Unidirectional Growth in a Single Crystal Turbine Blade Casting

机译：单晶涡轮叶片铸件中单向生长的建模

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摘要

Single crystal superalloy turbine blade are widely used in aero-engineering. However, there are often grain defects occurring during the fabrication of blade by casting. It is important to study the formation of microstructure related defects in turbine blades. Single crystal blade sample castings of a nickel-base superalloy were produced at different withdrawal rates by the directional solidification process and investment casting. There was a difference between the microstructure morphology at the top part of the turbine blade sample castings and the one at the bottom. Higher withdrawal rates led to more differences in the microstructure and a higher probability of crystallographic defect formation such as high angle boundaries at locations with an abrupt change of the transversal section area. To further investigate the formation of grain defects, a numerical simulation technique was used to predict the crystallographic defects occurring during directional solidification. The simulation results agreed with the experimental ones.
机译：单晶高温合金涡轮机叶片广泛用于航空工程。然而，在通过铸造制造叶片的过程中经常会出现晶粒缺陷。研究涡轮叶片中与微观结构有关的缺陷的形成非常重要。通过定向凝固工艺和熔模铸造，以不同的拉拔速率生产了镍基高温合金的单晶叶片样品铸件。涡轮叶片样品铸件顶部的显微组织形态与底部的显微组织形态有所不同。较高的拉拔速率导致微观结构上的差异更大，并且形成晶体学缺陷的可能性更高，例如在横截面积急剧变化的位置处出现高角度边界。为了进一步研究晶粒缺陷的形成，使用了一种数值模拟技术来预测定向凝固过程中发生的晶体缺陷。仿真结果与实验结果吻合。

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