Abstract
Convection and composition variations in the liquid zone during solidification of H2O-NH4C1 solution, which has the same model of convection as that of steel ingot, are studied. It is shown that a weak convection region forms near the ingot top in the liquid zone at a certain stage of solidification and then develops downward gradually, and the negative segregation is detected in the weak convection region. This interesting phenomenon reveals the formation process of hot-top segregation in steel ingots. The parameter dp L /df L, an important factor affecting the formation of hot-top segregation, is established as a function of the steel composition. When dp L/dfL is decreased by changing the steel composition, hot-top segregation will be impeded.
| Original language | English |
|---|---|
| Pages (from-to) | 723-730 |
| Number of pages | 8 |
| Journal | Metallurgical Transactions B |
| Volume | 20 |
| Issue number | 5 |
| DOIs | |
| State | Published - Oct 1989 |