Abstract
The investigation was carried out to study the effects of solidification pressure and cooling rate on microstructure of A357 alloy during counter-gravity casting solidification process. The results show that, from the center to the edge of samples, the secondary dendrite spacing λ 2 reduced and microstructure was refined with the cooling rate increasing; as the solidification pressure increased from 1.55 kPa to 30.90 kPa, λ 2 decreased and the morphology of iron-bearing phase changed from needle-like to skeleton shape; the microstructure was refined more remarkable with the increase of solidification pressure and cooling rate.
| Original language | English |
|---|---|
| Pages (from-to) | 887-890 |
| Number of pages | 4 |
| Journal | Zhuzao/Foundry |
| Volume | 58 |
| Issue number | 9 |
| State | Published - Sep 2009 |
Keywords
- A357 alloy
- Cooling rate
- Counter-gravity casting
- Iron-bearing phase
- Microstructure