Abstract
The solidification microstructure of DD3 Ni base single crystal superalloy is studied under different melt superheated temperatures and constant solid/liquid interface temperature gradient. The DTA results show that there are a series of melt structure changes between 1380°C and 1650°C. At withdrawn rate of 50 μm/s, the primary dendrite arm spacing is decreased from 177 μm to 150 μm and 125 μm when the superheating temperature is increased from 1500°C to 1640°C and 1780°C respectively, the γ′ are refined in both dendrite core and interdendrite area, and the morphology of the latter trends to be uniform.
| Original language | English |
|---|---|
| Pages (from-to) | 59-63 |
| Number of pages | 5 |
| Journal | Jinshu Xuebao/Acta Metallurgica Sinica |
| Volume | 44 |
| Issue number | 1 |
| State | Published - Jan 2008 |
Keywords
- γ′ phase
- DD3 single crystal superalloy
- Melt superheating treatment
- Primary dendrite arm spacing
- Solidification microstructure