Institut für Metallurgie

Arbeitsgruppe Metallurgische Prozesstechnik

The influence of Aluminum on the iron-carbon system with Si-S-Mg presence.

Thermocalc, TCFE6.1, Fe-C (0-5% Al)

An interesting case was studied a complex alloy, its composition is shown in the table.

Composition Alloy
Content wt%
Si S Mg C Al
3.4 0.008 0.045 3.1 0-4

Legend (Phases):
  1. Liquid
  2. Liquid-Graphite
  3. Liquid-FCC_A1
  4. Graphite-FCC_A1
  5. FCC_A1
  6. BCC_A2-FCC_A1
  7. FCC_A1-BCC_A2-Graphite
  8. BCC_A2-Graphite
  9. Liquid-BCC_A2
  10. Liquid-BCC_A2-FCC_A1
  11. Liquid-FCC_A1-Graphite
  12. FCC_A1-Graphite-Kappa
  13. BCC_A2-FCC_A1-Kappa
  14. FCC_A1-Kappa
  15. BCC_A2-Kappa
  16. Liquid-Graphite-Kappa
  17. Liquid-FCC_A1-Kappa
  18. 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.
Critical Points
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
T (°C) %wt.C

Changed: 22.09.2009 Jens Wendelstorf
© TU Clausthal 2009 · Impressum