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A comprehensive understanding of grain selection in spiral grain selector during directional solidification

Journal of Materials Science & Technology 2022年第7期102卷 204-212页

作者： Binqiang Wang Long Zeng Neng Ren Mingxu Xia Jianguo Li School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China

It is of great importance to further investigate grain selection mechanism for the production of single crystal(SX) turbine blade because a single crystal with optimized crystal orientation will enhance service performance of the blade *** this paper,single crystals with different deviation angles,i.e.6°,12° and 29°, were obtained using directional solidification under the same casting *** has been found that the grain selection in spiral selector is a coupling process where high order dendrites branch in the front side and primary dendrites disappear in the back side based on the metallographic analysis and electron back scatter diffraction(EBSD).Considering the development of liquid/solid interface by numerical simulation,a combination effect with space expansion,geometrical restriction and grain competition was proposed for spiral grain *** space expansion mechanism dominates the process as it provides growth space and driving force for high order dendrites ***,the smaller the take-off angle(θ) is,the larger space and the stronger driving force high order dendrites will get,and the higher efficient the selector will be. The competitive growth between the secondary dendrites plays more contribution than that of primary dendrites,*** with preferred secondary dendrites instead of preferred primary dendrites could outcompete during grain selection,and this is the reason why spiral grain selector cannot optimize the orientation of the primary *** findings provide experimental evidence for spatial control of SX growth,and benefit the sophistic casting fields such as turbine blade casting for improved yield.

关键词： Ni-based superalloy Spiral grain selector Space expansion geometrical restriction Grain competition

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