The influence of Aluminum on the iron-carbon system with Si-S-Mg presence.
An interesting case was studied a complex alloy, its composition is shown in the table.
Content wt% | ||||
| Si | S | Mg | C | Al |
| 3.4 | 0.008 | 0.045 | 3.1 | 0-4 |
Composition Alloy
Legend (Phases):
- Liquid
- Liquid-Graphite
- Liquid-FCC_A1
- Graphite-FCC_A1
- FCC_A1
- BCC_A2-FCC_A1
- FCC_A1-BCC_A2-Graphite
- BCC_A2-Graphite
- Liquid-BCC_A2
- Liquid-BCC_A2-FCC_A1
- Liquid-FCC_A1-Graphite
- FCC_A1-Graphite-Kappa
- BCC_A2-FCC_A1-Kappa
- FCC_A1-Kappa
- BCC_A2-Kappa
- Liquid-Graphite-Kappa
- Liquid-FCC_A1-Kappa
- Liquid-Kappa
Ideas
- Austenitic region is small.
- This region grows up with the Aluminum content.
- There is not carbides precipitation.
- The aluminum content change the eutectic point.
Profile critical points
The next table and graphic show the temperature and composition variation with Aluminum content in the system.
| Al(%wt) | Peritectic | Eutectic | ||
| C (%wt) | T (°C) | C (%wt) | T (°C) | |
| 0.5 | 0.3146 | 1397 | 3.302 | 1185 |
| 1 | 0.331 | 1398 | 3.282 | 1203 |
| 2 | 0.359 | 1398 | 3.217 | 1229 |
| 2.5 | 0.373 | 1397 | 3.177 | 1238 |
| 3 | 0.386 | 1395 | 3.135 | 1246 |
| 3.5 | 0.398 | 1393 | 3.09 | 1252 |
| 4 | 0.411 | 1390 | 3.044 | 1257 |
Critical Points
