Abstract
The bi-crystal competitive growth in a nickel-based superalloy AM3 during the cell/dendrite directional solidification was investigated using seed crystals. The results show that the relative position of <001> orientations in bi-crystal has a great influence on the competitive growth. For bi-crystal with <001> orientations grown in different planes, the competitive growth is dependent on physical blocking between the cell/dendrites. The grain playing dominant blocking at the grain boundary is survived during the competitive growth. For bi-crystal with <001> orientations grown in the same plane, the two seed crystals with their preferred growth directions are far away from that of the maximum temperature gradient in a divergent way, and a stray grain may appear and grow as a single crystal.
| Original language | English |
|---|---|
| Pages (from-to) | 1622-1626 |
| Number of pages | 5 |
| Journal | Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering |
| Volume | 42 |
| Issue number | 8 |
| State | Published - Aug 2013 |
Keywords
- Cell/dendrite interface
- Competitive growth
- Directional solidification
- Superalloy