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- Title
Effect of Initial Position and Crystallographic Orientation on Grain Selection Procedure in Z-Form Selector for Ni-Based Single-Crystal Superalloy.
- Authors
Guo, Yuanyuan; Bao, Jun; Zhang, Xuanning; Zhang, Mai; Yang, Xiqiong; Zhang, Jian
- Abstract
The grain selection process in a Z-form selector for Ni-based single-crystal superalloy was simulated using a macro-scale ProCAST software (2013 version) coupled CAFE module combined with an experiment to investigate the grain selection procedure and mechanism with different grain positions and crystal orientation relationships. A non-stationary solidification process was found in the Z-form selector, and the liquid–solid (L–S) interface was tilted in the same direction as the selector channel during directional solidification. Given that the grain boundary was parallel to the Z-form selector, the overgrowth rate of the bi-crystal in the selector channel was very low. The initial position of the bi-crystal in the selector channel has a greater effect on the overgrowth rate than the effects of primary and secondary orientations. The grain selection was a result of the coupling of the competitive grain growth effect and geometrical restriction effect. Finally, the selection grain mechanism within the Z-form selector was discussed, coalescing the temperature field and the grain competition growth mechanism.
- Subjects
HEAT resistant alloys; CRYSTAL orientation; DIRECTIONAL solidification; GRAIN; CRYSTAL grain boundaries; RESTAURANTS
- Publication
Materials (1996-1944), 2024, Vol 17, Issue 8, p1885
- ISSN
1996-1944
- Publication type
Article
- DOI
10.3390/ma17081885