Institut für Metallurgie

Arbeitsgruppe Metallurgische Prozesstechnik

The influence of Aluminum on the iron-carbon system

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

  • The austenitic region is less when the aluminum content grows up.
  • The mixed between FCC-BCC phase is directly proportional to the aluminum content.
  • There are not carbides precipitation.
  • There is graphite phase because There is Cementite descomposition.
  • The aluminum content does not have a big effect in the peritectic 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 0.358 1466 4.347 1193
1 0.367 1468 4.323 1217
1.5 0.375 1469 4.286 1235
2.5 0.389 1470 4.195 1261
3 0.3969 1469 4.145 1261
3.5 0.404 1468 4.092 1278
4 0.41 1466 4.039 1285
5 0.423 1461 3.93 1296
T (°C) %wt.C

Changed: 22.09.2009 Jens Wendelstorf (Tel. -2281)
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