Institut für Metallurgie

Arbeitsgruppe Metallurgische Prozesstechnik

The influence of silicon on the iron-carbon system

Thermocalc, TCFE6.1, Fe-C (0-5% Si)
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. BCC_A2
  11. Liquid-BCC_A2-FCC_A1

Ideas

  • The silicon content is indirectly proportional with the austenitic phase.
  • This element has a big effect on the important points of this diagrams, like peritectic, eutectic point, etc.
  • The liquid-graphite´s phase (region 2) is grows up at the same time that the silicon content is bigger.
  • The Silicon helps to grow up alfa phase.

Profile critical points

The next table and graphic show the temperature and composition variation with Silicon content in the system.
Critical Points
Si(%wt)
Peritectic
Eutectic
C (%wt) T (°C) C (%wt) T (°C)
0.5 0.386 1454 4.16 1153
1 0.3291 1445 3.99 1154
1.5 0.32 1436 3.8 1155
1.8 0.3163 1430 3.74 1156
2 0.3135 1426 3.679 1157
2.5 0.307 1415 3.53 1159
3 0.301 1404 3.38 1161
3.5 0.2959 1393 3.24 1163
4 0.2917 1381 3.099 1165
4.5 0.288 1368 2.96 1166
5 0.2861 1335 2.824 1167
T (°C) %wt.C

Changed: 22.09.2009 Jens Wendelstorf
© TU Clausthal 2009 · Impressum